Water

22 pages, 3782 KiB

Open AccessReview

Reuse and Recycling of Livestock and Municipal Wastewater in Chilean Agriculture: A Preliminary Assessment

by Cristina-Alejandra Villamar^1,*

, Ismael Vera-Puerto²

, Diego Rivera³

and Felipe De la Hoz⁴

¹ Departamento de Ingeniería en Obras Civiles, Facultad de Ingeniería, Universidad de Santiago de Chile, Av. Ecuador 3659, Estación Central, Santiago 9170124, Chile

² Centro de Innovación en Ingeniería Aplicada, Departamento de Obras Civiles, Facultad de Ciencias de la Ingeniería, Universidad Católica del Maule, Av. San Miguel 3605, Talca 3480112, Chile

³ Centro de Recursos Hídricos para la Agricultura y Minería CRHIAM, Laboratorio de Políticas Comparadas en Gestión de Recursos Hídricos, Universidad de Concepción, Av. Méndez 595, Chillán 3812120, Chile

⁴ Centro del Agua para la Agricultura, Universidad de Concepción, Av. Méndez 595, Chillán 3812120, Chile

Water 2018, 10(6), 817; https://doi.org/10.3390/w10060817 - 20 Jun 2018

Cited by 59 | Viewed by 11107

Abstract

Chile is an agricultural power, but also one of the most vulnerable countries to climate change and water shortage. About 50% of the irrigated agriculture land in Chile is in the central zone, thanks to its agricultural-climatic characteristics that provide an adequate water [...] Read more.

Chile is an agricultural power, but also one of the most vulnerable countries to climate change and water shortage. About 50% of the irrigated agriculture land in Chile is in the central zone, thanks to its agricultural-climatic characteristics that provide an adequate water supply (100–4000 m³/s). However, the vulnerability scenario in this zone is high due to the seasonal availability of water resources. Therefore, opportunities to use non-conventional alternative sources (e.g., wastewater) become an appealing and feasible option due to the high population and animal density (>76%) in this part of the country. Moreover, the physicochemical characteristics of the municipal and livestock wastewater suggest that there are potential opportunities to recycle nutrients for agricultural production. In Chile, wastewater reuse opportunities are noted by the wide coverage of wastewater treatment programs, with municipal and intensified livestock production taking up most of the percentage (>99%). Nevertheless, more than 70% of wastewater treatment systems reach biological secondary treatment, which suggests reuse possibilities only for non-food crops. Therefore, this paper is focused on a preliminary analysis of the potential of reusing and recycling municipal and livestock wastewater for Chilean agriculture. There is some reuse work occurring in Chile, specifically in the use of municipal and livestock wastewater for cereal crops (animal feed), forests, and grasslands. However, aspects related to the long-term effects of these practices have not yet been evaluated. Therefore, municipal and livestock wastewater in Chile could be re-valued in agriculture, but the current quality and condition of treated wastewater do not ensure its safe use in food crops. In addition, state policies are needed to provide sustainability (circular and ethic economy) to water reusing/recycling in agriculture. Full article

(This article belongs to the Section Wastewater Treatment and Reuse)

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24 pages, 5140 KiB

Open AccessFeature PaperArticle

Phosphorus Fluxes from Three Coastal Watersheds under Varied Agriculture Intensities to the Northern Gulf of Mexico

by Songjie He¹ and Y. Jun Xu^1,2,*

¹ School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA

² Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA

Water 2018, 10(6), 816; https://doi.org/10.3390/w10060816 - 20 Jun 2018

Cited by 3 | Viewed by 5116

Abstract

This study aims to evaluate recent total phosphorus (TP) and dissolved inorganic phosphorus (DIP) transport from three coastal rivers—the Calcasieu, Mermentau, and Vermilion Rivers—that drain watersheds with varied agriculture intensities (21%, 67%, and 61%, respectively) into the northern Gulf of Mexico, one of [...] Read more.

This study aims to evaluate recent total phosphorus (TP) and dissolved inorganic phosphorus (DIP) transport from three coastal rivers—the Calcasieu, Mermentau, and Vermilion Rivers—that drain watersheds with varied agriculture intensities (21%, 67%, and 61%, respectively) into the northern Gulf of Mexico, one of the world’s largest summer hypoxic zones. The study also examined the spatial trends of TP and DIP from freshwater to saltwater along an 88-km estuarine reach with salinity increasing from 0.02 to 29.50. The results showed that from 1990–2009 to 2010–2017, the TP fluxes for one of the agriculture-intensive rivers increased while no significant change was found for the other two rivers. Change in river discharge was the main reason for this TP flux trend. The two more agriculture-intensive river basins showed consistently higher TP and DIP concentrations and fluxes, as well as higher DIP:TP ratios than the river draining less agriculture-intensive land, confirming the strong effect of land uses on phosphorus input and speciation. Longitudinal profiles of DIP along the salinity gradient of the estuarine reach displayed characteristic input behavior. Desorption of DIP from suspended solids and river bed sediments, urban inputs, as well as stronger calcium carbonate and phosphorus co-precipitation at the marine endmember could be the reasons for such mixing dynamics. Full article

(This article belongs to the Special Issue Recent Progress in River Biogeochemistry Research)

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11 pages, 522 KiB

Open AccessTechnical Note

Parameter Estimation for Soil Water Retention Curve Using the Salp Swarm Algorithm

by Jing Zhang^1,2,3, Zhenhua Wang^4,* and Xiong Luo^1,2,3,*

¹ School of Computer and Communication Engineering, University of Science and Technology Beijing (USTB), Beijing 100083, China

² Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China

³ Key Laboratory of Geological Information Technology, Ministry of Land and Resources, Beijing 100037, China

⁴ College of Water Resources and Architectural Engineering, Shihezi University, Shihezi 832003, China

Water 2018, 10(6), 815; https://doi.org/10.3390/w10060815 - 20 Jun 2018

Cited by 60 | Viewed by 6223

Abstract

This paper employs an optimization algorithm called the salp swarm algorithm (SSA) for the parameter estimation of the soil water retention curve model. The SSA simulates the behavior of searching for food of the salp swarm and manages to find the optimal solutions [...] Read more.

This paper employs an optimization algorithm called the salp swarm algorithm (SSA) for the parameter estimation of the soil water retention curve model. The SSA simulates the behavior of searching for food of the salp swarm and manages to find the optimal solutions for optimization problems. In this paper, parameter estimation of the van Genuchten model based on nine soil samples, covering eight soil textures, is conducted. The optimization problem that minimizes the difference between the measured and the estimated water content is formulated, and the SSA is applied to solve this problem. To validate the competitive advantage of the SSA, the experimental results are compared with Particle Swarm Optimization algorithm, the Differential Evolution algorithm and the RETC program, which indicates that SSA performs better than the three methods. Full article

(This article belongs to the Special Issue Data-Driven Methods for Agricultural Water Management)

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26 pages, 10512 KiB

Open AccessArticle

The Impacts of Climate Variability and Land Use Change on Streamflow in the Hailiutu River Basin

by Guangwen Shao, Yiqing Guan, Danrong Zhang^*, Baikui Yu and Jie Zhu

College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China

Water 2018, 10(6), 814; https://doi.org/10.3390/w10060814 - 20 Jun 2018

Cited by 51 | Viewed by 7110

Abstract

The Hailiutu River basin is a typical semi-arid wind sandy grass shoal watershed in northwest China. Climate and land use have changed significantly during the period 1970–2014. These changes are expected to impact hydrological processes in the basin. The Mann–Kendall (MK) test and [...] Read more.

The Hailiutu River basin is a typical semi-arid wind sandy grass shoal watershed in northwest China. Climate and land use have changed significantly during the period 1970–2014. These changes are expected to impact hydrological processes in the basin. The Mann–Kendall (MK) test and sequential t-test analysis of the regime shift method were used to detect the trend and shifts of the hydrometeorological time series. Based on the analyzed results, seven scenarios were developed by combining different land use and/or climate situations. The Soil Water Assessment Tool (SWAT) model was applied to analyze the impacts of climate variability and land use change on the values of the hydrological components. The China Meteorological Assimilation Driving Datasets for the SWAT model (CMADS) was applied to enhance the spatial expressiveness of precipitation data in the study area during the period 2008–2014. Rather than solely using observed precipitation or CMADS precipitation, the precipitation values of CMADS and the observed precipitation values were combined to drive the SWAT model for better simulation results. From the trend analysis, the annual streamflow and wind speed showed a significant downward trend. No significant trend was found for the annual precipitation series; however, the temperature series showed upward trends. With the change point analysis, the whole study period was divided into three sub-periods (1970–1985, 1986–2000, and 2001–2014). The annual precipitation, mean wind speed, and average temperature values were 316 mm, 2.62 m/s, and 7.9 °C, respectively, for the sub-period 1970–1985, 272 mm, 2.58 m/s, and 8.4 °C, respectively, for the sub-period 1986–2000, and 391 mm, 2.2 m/s, and 9.35 °C, respectively, for the sub-period 2001–2014. The simulated mean annual streamflow was 35.09 mm/year during the period 1970–1985. Considering the impact of the climate variability, the simulated mean annual streamflow values were 32.94 mm/year (1986–2000) and 36.78 mm/year (2001–2014). Compared to the period 1970–1985, the simulated mean annual streamflow reduced by 2.15 mm/year for the period 1986–2000 and increased by 1.69 mm/year for the period 2001–2014. The main variations of land use from 1970 to 2014 were the increased area of shrub and grass land and decreased area of sandy land. In the simulation it was shown that these changes caused the mean annual streamflow to decrease by 0.23 mm/year and 0.68 mm/year during the periods 1986–2000 and 2001–2014, respectively. Thus, the impact of climate variability on the streamflow was more profound than that of land use change. Under the impact of coupled climate variability and land use change, the mean annual streamflow decreased by 2.45 mm/year during the period 1986–2000, and the contribution of this variation to the decrease in observed streamflow was 27.8%. For the period 2001–2014, the combined climate variability and land use change resulted in an increase of 0.84 mm/year in annual streamflow. The results obtained in this study could provide guidance for water resource management and planning in the Erdos plateau. Full article

(This article belongs to the Special Issue Application of the China Meteorological Assimilation Driving Datasets for the SWAT Model (CMADS) in East Asia)

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15 pages, 1380 KiB

Open AccessArticle

Extrapolation of Leaf Measurements to Obtain the Whole-Canopy Transpiration of C₃ and C₄ Xerophytic Shrubs

by Yanxia Jin^1,2, Xinping Wang^1,*, Yafeng Zhang¹, Yanxia Pan¹ and Rui Hu¹

¹ Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

² College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

Water 2018, 10(6), 813; https://doi.org/10.3390/w10060813 - 20 Jun 2018

Cited by 4 | Viewed by 4416

Abstract

Quantifying the water balance within areas with sparse vegetation requires frequent measurement of transpiration in water-limited, arid, desert ecosystems. Field experiments were conducted in Shapotou, northwestern China, to examine the feasibility of up-scaling the transpiration of C₃ and C₄ xerophytic shrubs [...] Read more.

Quantifying the water balance within areas with sparse vegetation requires frequent measurement of transpiration in water-limited, arid, desert ecosystems. Field experiments were conducted in Shapotou, northwestern China, to examine the feasibility of up-scaling the transpiration of C₃ and C₄ xerophytic shrubs (Reaumuria soongorica and Salsola passerina, respectively) from the leaf to the canopy level throughout the growing season in 2015. The large weighing lysimeter method and LI-6400XT portable photosynthesis system were used to make relatively long-term measurements of transpiration. The results indicated that meteorological factors coupled with stomatal conductance affected the transpiration rate of the two shrubs at the leaf level, and that the vapor pressure deficit other than net radiation and the air temperature affected the transpiration rate of S. passerina at the canopy level. Precipitation and vegetation characteristics determined the transpiration amount of the C₃ and C₄ xerophytic shrubs. The leaf gas exchange measurements were arithmetically scaled up to the canopy level based on the leaf area. The validity of the extrapolation was evaluated by comparing the upscale values of transpiration with the calculated values obtained from lysimeter measurement. The up-scaling approach accurately (±0.005 mm h⁻¹, RMSE = 35%) obtained canopy transpiration from the leaf measurements. Our study suggests that the up-scaling method based on leaf area can be adopted to determine the canopy transpiration of C₃ and C₄ xerophytic shrubs in arid desert environments. Full article

(This article belongs to the Section Hydrology)

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21 pages, 6621 KiB

Open AccessArticle

An Improved Approach for Evapotranspiration Estimation Using Water Balance Equation: Case Study of Yangtze River Basin

by Qiong Li^1,*, Zhicai Luo¹, Bo Zhong^2,3 and Hao Zhou^1,*

¹ MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

² School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

³ Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China

Water 2018, 10(6), 812; https://doi.org/10.3390/w10060812 - 19 Jun 2018

Cited by 22 | Viewed by 6201

Abstract

Evapotranspiration (ET) is a critical component of the water cycle, and it plays an important role in global water exchange and energy flow. However, accurate estimation and numerical simulation of regional ET remain difficult. In this work, based on the water balance equation, [...] Read more.

Evapotranspiration (ET) is a critical component of the water cycle, and it plays an important role in global water exchange and energy flow. However, accurate estimation and numerical simulation of regional ET remain difficult. In this work, based on the water balance equation, an improved regional ET estimating approach was developed by using Gravity Recovery and Climate Experiment (GRACE), daily precipitation, and discharge data. Firstly, the method and algorithm were validated by simulation study. Compared with ET estimated from previous methods, the result derived from our method present significant improvement, with the correlation coefficient great than 0.9. Secondly, using our improved method, the spatially averaged ET over the Yangtze River Basin (YRB) was computed for the period 2003–2013. The ET estimations were in good consistency with different ET products, and the mean annual value of ET estimation over the YRB was close to the difference between precipitation and discharge over the YRB. Thirdly, the comparison between ET estimation and independent estimates of meteorological factors and soil moisture over the entire YRB were conducted through the entire YRB. The analysis indicated that near-surface temperature, as responsive to atmospheric demand, was the limiting factor of time variation of ET, with the correlation coefficients of 0.69. We also analyzed the relationship between the mean annual ET and atmospheric demand for seven subcatchments of the YRB, which indicated that the spatial distribution characteristics of ET estimated by our method were in accord with atmospheric conditions. These results indicated the good performance of our improved approach in estimating ET variations over the YRB. It also demonstrates the applicability of GRACE to the analysis of hydrological features such as regional ET. Full article

(This article belongs to the Section Hydrology)

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18 pages, 8775 KiB

Open AccessArticle

Simulation of Fluid and Complex Obstacle Coupling Based on Narrow Band FLIP Method

by Changjun Zou and Yong Yin^*

Navigation College, Dalian Maritime University, Dalian 116026, China

Water 2018, 10(6), 811; https://doi.org/10.3390/w10060811 - 19 Jun 2018

Cited by 1 | Viewed by 5239

Abstract

With the continuous development of fluid simulation theory and technology, there are increasingly higher requirements for simulation of complex fluid interaction. Fluid simulation based on the Eulerian method is limited by the grid resolution, and the sawtooth phenomenon occurs near the obstacle boundary. [...] Read more.

With the continuous development of fluid simulation theory and technology, there are increasingly higher requirements for simulation of complex fluid interaction. Fluid simulation based on the Eulerian method is limited by the grid resolution, and the sawtooth phenomenon occurs near the obstacle boundary. To enhance the fluid interaction performance with complex obstacle, an advanced fluid interaction method was proposed based on NBFLIP. Improved from FLIP method, the NBFLIP method combines the advantages of Euler method and Lagrangian method. The SDF method is proposed in complex obstacle discretion, with an expectation to facilitate the processing with obstacle boundary and efficiency improvement. Compared with FLIP method, particle number in NBFLIP method is reduced by 86.2% and the average running time per frame is reduced by 36.1%. Full article

(This article belongs to the Section Hydraulics and Hydrodynamics)

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23 pages, 2641 KiB

Open AccessArticle

End Use Level Water and Energy Interactions: A Large Non-Residential Building Case Study

by Sudeep Nair^1,2,3,*, Hafiz Hashim^1,2,3, Louise Hannon^1,2,3

and Eoghan Clifford^1,2,3

¹ College of Engineering and Informatics, National University of Ireland, Galway H91 TK33, Ireland

² Ryan Institute, National University of Ireland, Galway H91 TK33, Ireland

³ Informatics Research Unit for Sustainable Engineering, National University of Ireland, Galway H91 TK33, Ireland

Water 2018, 10(6), 810; https://doi.org/10.3390/w10060810 - 19 Jun 2018

Cited by 10 | Viewed by 6088

Abstract

Within the European Union, buildings account for around 40% of the energy use and 36% of CO₂ emissions, thus representing a significant challenge in the context of recent EU directives that require all new buildings to be nearly zero-energy by 2020. Reduced [...] Read more.

Within the European Union, buildings account for around 40% of the energy use and 36% of CO₂ emissions, thus representing a significant challenge in the context of recent EU directives that require all new buildings to be nearly zero-energy by 2020. Reduced consumption of water, and hot water in particular, provides a significant opportunity to reduce energy consumption. While there have been numerous studies pertaining to the water-energy nexus of residential buildings, the complexity of water networks in larger buildings has meant that this area has been relatively unexplored. The paper presents a comprehensive investigation of the hot water use profile, associated energy use, on-site pumping energy use, carbon emissions, and solar energy harvesting potential in an Irish university building over periods before and after water conservation efforts. Total water-related energy consumption (including the heating and pumping losses) were analysed using the WHAM model and modified pumping energy expressions. The results revealed that water heating including losses contributed to as high as 30% of total building energy consumption, and stringent water conservation measures reduced the average hot water use rate by 8.5 m³/day. It was found that 10% of the total pumping energy was constituted by pump start-ups. Simulation results for solar harvesting potential in the study site found that around 60% of water heating energy demand could be met by solar energy in the new water demand scenario. The study results can act as a benchmark for similar buildings, and the model combination can be emulated in future studies. Full article

(This article belongs to the Special Issue Carbon Footprint of Water Supply and Wastewater Treatment)

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Graphical abstract

19 pages, 8048 KiB

Open AccessArticle

Multi-Source Uncertainty Analysis in Simulating Floodplain Inundation under Climate Change

by Nadine Maier^1,*

, Lutz Breuer^1,2

, Alejandro Chamorro¹, Philipp Kraft¹

and Tobias Houska¹

¹ Institute for Landscape Ecology and Resources Management (ILR), Research Centre for BioSystems, Land Use and Nutrition (iFZ), Justus Liebig University Giessen, Heinrich-Buff-Ring 26, 35392 Giessen, Germany

² Centre for International Development and Environmental Research (ZEU), Justus Liebig University Giessen, Senckenbergstraße 3, 35390 Giessen, Germany

Water 2018, 10(6), 809; https://doi.org/10.3390/w10060809 - 19 Jun 2018

Cited by 3 | Viewed by 5044

Abstract

Floodplains are highly complex and dynamic systems in terms of their hydrology. Thus, they harbor highly specialized floodplain plant species depending on different inundation characteristics. Climate change will most likely alter those characteristics. This study investigates the potential impact of climate change on [...] Read more.

Floodplains are highly complex and dynamic systems in terms of their hydrology. Thus, they harbor highly specialized floodplain plant species depending on different inundation characteristics. Climate change will most likely alter those characteristics. This study investigates the potential impact of climate change on the inundation characteristics of a floodplain of the Rhine River in Hesse, Germany. We report on the cascading uncertainty introduced through climate projections, climate model structure, and parameter uncertainty. The established modeling framework integrates projections of two general circulation models (GCMs), three emission scenarios, a rainfall–runoff model, and a coupled surface water–groundwater model. Our results indicate large spatial and quantitative uncertainties in the simulated inundation characteristics, which are mainly attributed to the GCMs. Overall, a shift in the inundation pattern, possible in both directions, and an increase in inundation extent are simulated. This can cause significant changes in the habitats of species adapted to these highly-endangered ecosystems. Full article

(This article belongs to the Section Hydrology)

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20 pages, 3122 KiB

Open AccessArticle

Research on Cascade Reservoirs’ Short-Term Optimal Operation under the Effect of Reverse Regulation

by Changming Ji¹, Hongjie Yu^1,*, Jiajie Wu¹, Xiaoran Yan¹ and Rui Li²

¹ School of Renewable Energy, North China Electric Power University, Beijing 102206, China

² Overseas Exam Service Center, Shijiazhuang Information Engineering Vocational College, Shijiazhuang 050035, China

Water 2018, 10(6), 808; https://doi.org/10.3390/w10060808 - 19 Jun 2018

Cited by 14 | Viewed by 4965

Abstract

Currently research on joint operation of a large reservoir and its re-regulating reservoir focuses on either water quantity regulation or water head regulation. The accuracy of relevant models is in need of improvement if the influence of factors such as water flow hysteresis [...] Read more.

Currently research on joint operation of a large reservoir and its re-regulating reservoir focuses on either water quantity regulation or water head regulation. The accuracy of relevant models is in need of improvement if the influence of factors such as water flow hysteresis and the aftereffect of tail water level variation are taken into consideration. In this paper, given the actual production of Pankou-Xiaoxuan cascade hydropower stations that combines two operation modes (‘electricity to water’ and ‘water to electricity’), a coupling model of their short-term optimal operation is developed, which considers Xiaoxuan reservoir’s regulating effect on Pankou reservoir’s outflow volume and water head. Factors such as water flow hysteresis and the aftereffect of tail water level variation are also considered to enhance the model’s accuracy. The Backward Propagation (BP) neural network is employed for precise calculation of the downstream reservoir’s inflow and the upstream reservoir’s tail water level. Besides, we put forth Accompanying Progressive Optimality Algorithm (APOA) to solve the coupling model with aftereffect. An example is given to verify the scientificity of the proposed model and the advantages of APOA. Through analysis of the model calculation results, the optimal operation rules of the cascade reservoirs are obtained in terms of water quantity regulation and water head regulation, which can provide scientific reference for cascade reservoirs’ optimal operation. Full article

(This article belongs to the Special Issue Adaptive Catchment Management and Reservoir Operation)

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21 pages, 2168 KiB

Open AccessArticle

Improving the Muskingum Flood Routing Method Using a Hybrid of Particle Swarm Optimization and Bat Algorithm

by Mohammad Ehteram¹, Faridah Binti Othman², Zaher Mundher Yaseen^3,*

, Haitham Abdulmohsin Afan³, Mohammed Falah Allawi⁴, Marlinda Bt. Abdul Malek^5,6, Ali Najah Ahmed^5,7, Shamsuddin Shahid⁸

, Vijay P. Singh⁹ and Ahmed El-Shafie²

¹ Department of Water Engineering and Hydraulic Structures, Faculty of Civil Engineering, Semnan University, Semnan 35131-19111, Iran

² Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia

³ Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

⁴ Civil and Structural Engineering Department, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia

⁵ Department of Civil Engineering, College of Engineering, University Tenaga National, Kajang 43000, Malaysia

⁶ Institute of Policy Energy Research (IPERe), Universiti Tenaga National, Kajang 43000, Malaysia

⁷ Institute for Energy Infrastructures, University Tenaga National, Kajang 43000, Malaysia

⁸ Faculty of Civil Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia

⁹ Department of Biological and Agricultural Engineering and Zachry Department of Civil Engineering, Texas A&M University, 2117 TAMU, College Station, TX 77843-2117, USA

Water 2018, 10(6), 807; https://doi.org/10.3390/w10060807 - 19 Jun 2018

Cited by 54 | Viewed by 7311

Abstract

Flood prediction and control are among the major tools for decision makers and water resources planners to avoid flood disasters. The Muskingum model is one of the most widely used methods for flood routing prediction. The Muskingum model contains four parameters that must [...] Read more.

Flood prediction and control are among the major tools for decision makers and water resources planners to avoid flood disasters. The Muskingum model is one of the most widely used methods for flood routing prediction. The Muskingum model contains four parameters that must be determined for accurate flood routing. In this context, an optimization process that self-searches for the optimal values of these four parameters might improve the traditional Muskingum model. In this study, a hybrid of the bat algorithm (BA) and the particle swarm optimization (PSO) algorithm, i.e., the hybrid bat-swarm algorithm (HBSA), was developed for the optimal determination of these four parameters. Data for the three different case studies from the USA and the UK were utilized to examine the suitability of the proposed HBSA for flood routing. Comparative analyses based on the sum of squared deviations (SSD), sum of absolute deviations (SAD), error of peak discharge, and error of time to peak showed that the proposed HBSA based on the Muskingum model achieved excellent flood routing accuracy compared to that of other methods while requiring less computational time. Full article

(This article belongs to the Special Issue Flood Forecasting Using Machine Learning Methods)

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19 pages, 5551 KiB

Open AccessArticle

Water Quality Prediction Model of a Water Diversion Project Based on the Improved Artificial Bee Colony–Backpropagation Neural Network

by Siyu Chen^*, Guohua Fang^*, Xianfeng Huang and Yuhong Zhang

College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China

Water 2018, 10(6), 806; https://doi.org/10.3390/w10060806 - 18 Jun 2018

Cited by 70 | Viewed by 9019

Abstract

Prediction of water quality which can ensure the water supply and prevent water pollution is essential for a successful water transfer project. In recent years, with the development of artificial intelligence, the backpropagation (BP) neural network has been increasingly applied for the prediction [...] Read more.

Prediction of water quality which can ensure the water supply and prevent water pollution is essential for a successful water transfer project. In recent years, with the development of artificial intelligence, the backpropagation (BP) neural network has been increasingly applied for the prediction and forecasting field. However, the BP neural network frame cannot satisfy the demand of higher accuracy. In this study, we extracted monitoring data from the water transfer channel of both the water resource and the intake area as training samples and selected some distinct indices as input factors to establish a BP neural network whose connection weight values between network layers and the threshold of each layer had already been optimized by an improved artificial bee colony (IABC) algorithm. Compared with the traditional BP and ABC-BP neural network model, it was shown that the IABC-BP neural network has a greater ability for forecasting and could achieve much better accuracy, nearly 25% more precise than the BP neural network. The new model is particularly practical for the water quality prediction of a water diversion project and could be readily applied in this field. Full article

(This article belongs to the Special Issue Water Quality: A Component of the Water-Energy-Food Nexus)

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11 pages, 1162 KiB

Open AccessArticle

Presence of Antibiotic-Resistant Escherichia coli in Wastewater Treatment Plant Effluents Utilized as Water Reuse for Irrigation

by Asli Aslan^*, Zachariah Cole, Anunay Bhattacharya

and Oghenekpaobor Oyibo

Department of Epidemiology and Environmental Health Sciences, Georgia Southern University, Statesboro, GA 30460, USA

Water 2018, 10(6), 805; https://doi.org/10.3390/w10060805 - 18 Jun 2018

Cited by 33 | Viewed by 12703

Abstract

Providing safe water through water reuse is becoming a global necessity. One concern with water reuse is the introduction of unregulated contaminants to the environment that cannot be easily removed by conventional wastewater treatment plants (WWTP). The occurrence of ampicillin, sulfamethoxazole, ciprofloxacin, and [...] Read more.

Providing safe water through water reuse is becoming a global necessity. One concern with water reuse is the introduction of unregulated contaminants to the environment that cannot be easily removed by conventional wastewater treatment plants (WWTP). The occurrence of ampicillin, sulfamethoxazole, ciprofloxacin, and tetracycline-resistant Escherichia coli through the treatment stages of a WWTP (raw sewage, post-secondary, post-UV and post-chlorination) was investigated from January to May 2016. The highest concentrations of antibiotic resistant E. coli in the effluent were detected in April after rainfall. Ampicillin-resistant E. coli was the most common at the post UV and chlorination stages comprising 63% of the total E. coli population. The minimum inhibitory concentration (MIC) analysis showed that one in five isolates was resistant to three or more antibiotics, and the majority of these E. coli were resistant to ampicillin, followed by sulfamethoxazole and ciprofloxacin. The highest MIC was detected at the finished water after application of multiple disinfection methods. Tetracycline resistance was the least observed among others, indicating that certain drug families may respond to wastewater treatment differently. Currently, there are no policies to enforce the monitoring of antibiotic-resistant pathogen removal in WWTP. Better guidelines are needed to better regulate reuse water and prevent health risk upon exposure to antibiotic-resistant bacteria. Full article

(This article belongs to the Special Issue Antimicrobial Resistance in Environmental Waters)

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22 pages, 29622 KiB

Open AccessFeature PaperArticle

Delineation of Suitable Zones for the Application of Managed Aquifer Recharge (MAR) in Coastal Aquifers Using Quantitative Parameters and the Analytical Hierarchy Process

by Nerantzis Kazakis

Department of Geology, Lab. of Engineering Geology & Hydrogeology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

Water 2018, 10(6), 804; https://doi.org/10.3390/w10060804 - 18 Jun 2018

Cited by 53 | Viewed by 9419

Abstract

Coastal aquifer salinization is usually related to groundwater overexploitation and water table decline. Managed Aquifer Recharge (MAR) can be applied as a measure to reverse and prevent this phenomenon. A detailed literature review was performed to identify the various methods and parameters commonly [...] Read more.

Coastal aquifer salinization is usually related to groundwater overexploitation and water table decline. Managed Aquifer Recharge (MAR) can be applied as a measure to reverse and prevent this phenomenon. A detailed literature review was performed to identify the various methods and parameters commonly used to determine suitable sites of MAR application. Based on the review results, a new multi-criteria index (SuSAM) that is compatible to coastal aquifers was developed to delineate suitable zones for MAR application. New parameters were introduced into the index, such as distance from the shore and hydraulic resistance of the vadose zone, while factor weights were determined using the Analytical Hierarchy Process (AHP) and single sensitivity analysis. The applicability of the new index was examined in the coastal aquifer of the Anthemountas basin located in northern Greece. The most suitable areas for MAR application cover 28% of the aquifer’s surface area, while 16% of the area was characterized as non-suitable for MAR application. The new method constitutes the first step of the managed aquifer recharge concept for the delineation of MAR-suitable zones in coastal aquifers. Full article

(This article belongs to the Special Issue Salinization of Coastal Aquifer Systems)

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17 pages, 4914 KiB

Open AccessArticle

Modeling the Spatial and Seasonal Variations of Groundwater Head in an Urbanized Area under Low Impact Development

by Yu Zheng¹, Sidian Chen¹, Huapeng Qin^1,* and Jiu Jimmy Jiao²

¹ Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China

² Department of Earth Sciences, The University of Hong Kong, Hong Kong, China

Water 2018, 10(6), 803; https://doi.org/10.3390/w10060803 - 17 Jun 2018

Cited by 18 | Viewed by 5278

Abstract

Increasing impervious land cover has great impacts on groundwater regimes in urbanized areas. Low impact development (LID) is generally regarded as a sustainable solution for groundwater conservation. However, the effects of LID on the spatial-temporal distribution of groundwater are not yet fully understood. [...] Read more.

Increasing impervious land cover has great impacts on groundwater regimes in urbanized areas. Low impact development (LID) is generally regarded as a sustainable solution for groundwater conservation. However, the effects of LID on the spatial-temporal distribution of groundwater are not yet fully understood. In this case study, a coupled Storm Water Management Model (SWMM) and Finite Element Subsurface FLOW system (FEFLOW) model was used to simulate surface and groundwater flow in an urbanized area in Shenzhen, China. After verification, the model was used to analyze the spatial-seasonal variations of groundwater head and hydrological processes under different LID scenarios. The results indicate that if the runoff from 7.5% and 15% of impervious area is treated by LID facilities, the annual surface runoff decreases by 5% and 9%, respectively, and the spatial average groundwater head relative to sea level pressure increases by 0.9 m and 1.7 m in the study area, respectively. The rise in groundwater head generally decreases from the recharge zones to the discharge zones surrounded by the streams and coastal waters. However, the groundwater head change is determined not only by the location in the catchment, but also by the hydraulic conductivity of underlying aquifer and LID infiltration intensity. Moreover, LID significantly enhances groundwater recharge and aquifer storage in the wet seasons; in turn it increases aquifer release and groundwater discharge in the dry seasons. However, LID has the potential to increase the risk of groundwater flooding during wet seasons in areas with poor aquifer drainage capacity and shallow groundwater depth. The findings from this study provide the basis for further assessing the benefit and risk of LID infiltration for groundwater supplementation in the urbanized areas. Full article

(This article belongs to the Section Urban Water Management)

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3 pages, 159 KiB

Open AccessEditorial

The Impact of Climate on Hydrological Extremes

by Salvatore Manfreda^1,*

, Vito Iacobellis², Andrea Gioia²

, Mauro Fiorentino¹ and Krzysztof Kochanek³

¹ Department of European and Mediterranean Cultures: Architecture, Environment and Cultural Heritage (DiCEM), University of Basilicata, 75100 Matera, Italy

² Department of Civil, Environmental, Land, Construction and Chemistry (DICATECh), Polytechnic University of Bari, 70125 Bari, Italy

³ Institute of Geophysics, Polish Academy of Sciences, 01-452 Warsaw, Poland

Water 2018, 10(6), 802; https://doi.org/10.3390/w10060802 - 17 Jun 2018

Cited by 12 | Viewed by 4539

Abstract

High and low flows and associated floods and droughts are extreme hydrological phenomena mainly caused by meteorological anomalies and modified by catchment processes and human activities. They exert increasing on human, economic, and natural environmental systems around the world. In this context, global [...] Read more.

High and low flows and associated floods and droughts are extreme hydrological phenomena mainly caused by meteorological anomalies and modified by catchment processes and human activities. They exert increasing on human, economic, and natural environmental systems around the world. In this context, global climate change along with local fluctuations may eventually trigger a disproportionate response in hydrological extremes. This special issue focuses on observed extreme events in the recent past, how these extremes are linked to a changing global/regional climate, and the manner in which they may shift in the coming years. Full article

(This article belongs to the Special Issue Impact of Climate on Hydrological Extremes)

11 pages, 4806 KiB

Open AccessArticle

Effects of the Notch Angle, Notch Length and Injection Rate on Hydraulic Fracturing under True Triaxial Stress: An Experimental Study

by Yulong Chen^1,*, Qingxiang Meng^2,* and Jianwei Zhang^3,*

¹ State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

² Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China

³ School of Port and Transportation Engineering, Zhejiang Ocean University, Zhoushan 316022, China

Water 2018, 10(6), 801; https://doi.org/10.3390/w10060801 - 17 Jun 2018

Cited by 11 | Viewed by 5072

Abstract

This study focused on the effects of the notch angle, notch length, and injection rate on hydraulic fracturing. True triaxial hydraulic fracturing experiments were conducted with 300 × 300 × 300 mm cement mortar blocks. The test results showed that the fracture initiation [...] Read more.

This study focused on the effects of the notch angle, notch length, and injection rate on hydraulic fracturing. True triaxial hydraulic fracturing experiments were conducted with 300 × 300 × 300 mm cement mortar blocks. The test results showed that the fracture initiation pressure decreased as the notch length and injection rate increased, whereas, the fracture initiation pressure decreased as the notch angle decreased. Furthermore, the direction of the hydraulic fracture was always along the direction of the maximum principle stress. Full article

(This article belongs to the Special Issue Thermo-Hydro-Mechanical-Chemical Processes of Deep Underground Reservoirs)

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14 pages, 4309 KiB

Open AccessFeature PaperArticle

Quantification of Seasonal Precipitation over the upper Chao Phraya River Basin in the Past Fifty Years Based on Monsoon and El Niño/Southern Oscillation Related Climate Indices

by Tsuyoshi Kinouchi^1,*, Gakuji Yamamoto¹, Atchara Komsai¹ and Winai Liengcharernsit²

¹ Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, Yokohama 226-8503, Japan

² Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

Water 2018, 10(6), 800; https://doi.org/10.3390/w10060800 - 17 Jun 2018

Cited by 11 | Viewed by 5014

Abstract

For better water resources management, we proposed a method to estimate basin-scale seasonal rainfall over selected areas of the Chao Phraya River Basin, Thailand, from existing climate indices that represent variations in the Asian summer monsoon, the El Niño/Southern Oscillation, and sea surface [...] Read more.

For better water resources management, we proposed a method to estimate basin-scale seasonal rainfall over selected areas of the Chao Phraya River Basin, Thailand, from existing climate indices that represent variations in the Asian summer monsoon, the El Niño/Southern Oscillation, and sea surface temperatures (SST) in the Pacific Ocean. The basin-scale seasonal rainfall between 1965 and 2015 was calculated for the upper Ping River Basin (PRB) and the upper Nan River Basin (NRB) from a gridded rainfall dataset and rainfall data collected at several gauging stations. The corresponding climate indices, i.e., the Equatorial-Southern Oscillation Index (EQ-SOI), Indian Monsoon Index (IMI), and SST-related indices, were examined to quantify seasonal rainfall. Based on variations in the rainfall anomaly and each climate index, we found that IMI is the primary variable that can explain variations in seasonal rainfall when EQ-SOI is negative. Through a multiple regression analysis, we found that EQ-SOI and two SST-related indices, i.e., Pacific Decadal Oscillation Index (PDO) and SST anomalies in the tropical western Pacific (SST_NW), can quantify the seasonal rainfall for years with positive EQ-SOI. The seasonal rainfall calculated for 1975 to 2015 based on the proposed method was highly correlated with the observed rainfall, with correlation coefficients of 0.8 and 0.86 for PRB and NRB, respectively. These results suggest that the existing indices are useful for quantifying basin-scale seasonal rainfall, provided a proper classification and combination of the climate indices are introduced. The developed method could forecast seasonal rainfall over the target basins if well-forecasted climate indices are provided with sufficient leading time. Full article

(This article belongs to the Special Issue Adaptive Catchment Management and Reservoir Operation)

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19 pages, 5686 KiB

Open AccessArticle

Research on Characteristics of Groundwater Recharge in the Weishan Irrigated District Based on a Bromide Tracer

by Xin Cong, Zhenghe Xu^* and Tong Wang

School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China

Water 2018, 10(6), 799; https://doi.org/10.3390/w10060799 - 17 Jun 2018

Cited by 5 | Viewed by 4373

Abstract

Bromide was used as tracer in the Weishan Irrigated District to determine the groundwater recharge as well as to evaluate the impacts of different irrigation basin locations, irrigation regimes, and crop types on the recharge. The comprehensive recharge coefficient and the Kriging Spatial [...] Read more.

Bromide was used as tracer in the Weishan Irrigated District to determine the groundwater recharge as well as to evaluate the impacts of different irrigation basin locations, irrigation regimes, and crop types on the recharge. The comprehensive recharge coefficient and the Kriging Spatial Interpolation methods were used to distinguish the effects of precipitation and surface water irrigation on the groundwater recharge rate. The results show that the recharge rates ranged from 85.8 to 243 mm/a, with an average of 168 mm/a. The average recharge rate in the upstream district is greater in the downstream and the average recharge rate of irrigated land (193 mm/a) is greater than non-irrigated land (110 mm/a). The recharge rates in fields of winter wheat-summer maize and cotton with irrigation are 210 mm/a and 140 mm/a, respectively, while they are 115 mm/a and 94.1 mm/a under no irrigation conditions. The comprehensive recharge coefficient of groundwater in the upstream irrigation area is larger than that in the downstream. By comparing the spatial distribution of the groundwater level and the comprehensive recharge coefficient, it is found that there is a positive relationship between the groundwater level and the comprehensive recharge coefficient. The results of this study can provide reference and guidance to a water resources analysis of the Weishan Irrigated District. Full article

(This article belongs to the Section Hydrology)

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19 pages, 4170 KiB

Open AccessArticle

The Assessment of Green Water Based on the SWAT Model: A Case Study in the Hai River Basin, China

by Kui Zhu¹, Zibo Xie¹, Yong Zhao^2,*

, Fan Lu^2,*, Xinyi Song¹, Lu Li³

and Xiaomeng Song¹

¹ School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

² State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

³ Uni Research Climate, Bjerknes Centre for Climate Research, Jahnebakken 5, 5007 Bergen, Norway

Water 2018, 10(6), 798; https://doi.org/10.3390/w10060798 - 16 Jun 2018

Cited by 19 | Viewed by 6864

Abstract

Green water accounts for two-thirds of precipitation, and the proportion could be even higher in dry years. Conflicts between water supply and demand have gradually become severe in the Hai River Basin (HRB) due to the socio-economic development. Thus, the exploitation and the [...] Read more.

Green water accounts for two-thirds of precipitation, and the proportion could be even higher in dry years. Conflicts between water supply and demand have gradually become severe in the Hai River Basin (HRB) due to the socio-economic development. Thus, the exploitation and the utilization of green water have attracted increasing attention. By gathering the related hydrological, meteorological, and geographic data, the spatiotemporal distribution of green water in HRB and the impacts of land use types on green water are analyzed based on the SWAT (Soil and Water Assessment Tool) model in this study. Furthermore, three new indices are proposed for evaluation, including the maximum possible storage of green water (MSGW), the consumed green water (CGW), and the utilizable green water (UGW). The results show that (1) the MSGW is relatively low in plain areas and its spatial distribution is significantly associated with the soil type; (2) according to the evaluation results of CGW and UGW in HRB, a further improvement of utilization efficiency of green water could be achieved; (3) in general, the utilization efficiency of precipitation in farmlands is higher than other land use types, which means that the planting of appropriate plants could be helpful to enhance the utilization efficiency of green water. Our results summarize the spatiotemporal distribution of green water resource and provide a reference for water resources management in other water-short agricultural areas. Full article

(This article belongs to the Section Hydrology)

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29 pages, 1374 KiB

Open AccessReview

Disinfection Methods for Swimming Pool Water: Byproduct Formation and Control

by Huma Ilyas^1,*

, Ilyas Masih^1,2 and Jan Peter Van der Hoek^3,4

¹ Water Treatment and Management Consultancy, 2289 ED Rijswijk, The Netherlands

² IHE Delft, Institute for Water Education, 2611 AX Delft, The Netherlands

³ Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2600 GA Delft, The Netherlands

⁴ Strategic Centre, Waternet, 1096 AC Amsterdam, The Netherlands

Water 2018, 10(6), 797; https://doi.org/10.3390/w10060797 - 16 Jun 2018

Cited by 37 | Viewed by 17294

Abstract

This paper presents a comprehensive and critical comparison of 10 disinfection methods of swimming pool water: chlorination, electrochemically generated mixed oxidants (EGMO), ultraviolet (UV) irradiation, UV/chlorine, UV/hydrogen peroxide (H₂O₂), UV/H₂O₂/chlorine, ozone (O₃)/chlorine, O [...] Read more.

This paper presents a comprehensive and critical comparison of 10 disinfection methods of swimming pool water: chlorination, electrochemically generated mixed oxidants (EGMO), ultraviolet (UV) irradiation, UV/chlorine, UV/hydrogen peroxide (H₂O₂), UV/H₂O₂/chlorine, ozone (O₃)/chlorine, O₃/H₂O₂/chlorine, O₃/UV and O₃/UV/chlorine for the formation, control and elimination of potentially toxic disinfection byproducts (DBPs): trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles (HANs), trihaloacetaldehydes (THAs) and chloramines (CAMs). The statistical comparison is carried out using data on 32 swimming pools accumulated from the reviewed studies. The results indicate that O₃/UV and O₃/UV/chlorine are the most promising methods, as the concentration of the studied DBPs (THMs and HANs) with these methods was reduced considerably compared with chlorination, EGMO, UV irradiation, UV/chlorine and O₃/chlorine. However, the concentration of the studied DBPs including HAAs and CAMs remained much higher with O₃/chlorine compared with the limits set by the WHO for drinking water quality. Moreover, the enhancement in the formation of THMs, HANs and CH with UV/chlorine compared with UV irradiation and the increase in the level of HANs with O₃/UV/chlorine compared with O₃/UV indicate the complexity of the combined processes, which should be optimized to control the toxicity and improve the quality of swimming pool water. Full article

(This article belongs to the Section Water Quality and Contamination)

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19 pages, 3807 KiB

Open AccessArticle

Recent Glacier Mass Balance and Area Changes from DEMs and Landsat Images in Upper Reach of Shule River Basin, Northeastern Edge of Tibetan Plateau during 2000 to 2015

by Xiaowen Zhang^1,2, Haojie Li^1,2, Zhihua Zhang^1,2, Qianxin Wu^1,2 and Shiqiang Zhang^1,2,*

¹ Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Northwest University, Xi’an 710127, China

² College of Urban and Environmental Science, Northwest University, Xi’an 710127, China

Water 2018, 10(6), 796; https://doi.org/10.3390/w10060796 - 16 Jun 2018

Cited by 11 | Viewed by 5205

Abstract

Glacier changes in the Upper Reach of the Shule River Basin (URSRB) serve as a good indicator of climate change in the western part of the Qilian Mountains, located on the northeastern edge of the Tibetan Plateau. However, information on recent glacier changes [...] Read more.

Glacier changes in the Upper Reach of the Shule River Basin (URSRB) serve as a good indicator of climate change in the western part of the Qilian Mountains, located on the northeastern edge of the Tibetan Plateau. However, information on recent glacier changes in the URSRB is limited. In this study, the changes in ice surface elevation were determined using geodetic methods based on digital elevation models (DEMs) derived from the Shuttle Radar Topography Mission (SRTM) (2000), and from pairs of Third Resources Satellite (ZY-3) of China (taken around 2013). In addition, glacier area changes from 2000–2015, were derived from Landsat TM/ETM+/OLI images. The results suggest that 478 glaciers with an area of 375.1 ± 2.68 km² remained in the URSRB in 2015. Ice cover diminished by 57.5 ± 2.68 km² (11.9 ± 0.60%), or 0.79 ± 0.04% a⁻¹ and 35 small glaciers disappeared from 2000 to 2015 in the URSRB. The most pronounced glacier shrinkage occurred during 2004 to 2009. The average ice surface elevation of the URSRB from 1999 to 2013 reduced by about 4.98 ± 0.6 m, which is equal to a mass loss of 0.383 ± 0.046 m·a⁻¹. This reduction indicates that the ice storage loss has accelerated since 1999, compared to a mass loss of 0.21 ± 0.04 m·a⁻¹ around Tuanjiefeng from 1966 to 1999, as reported by Xu et al. (2013). Full article

(This article belongs to the Section Hydrology)

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18 pages, 5046 KiB

Open AccessArticle

Variability of Short-Term Diel Water Temperature Amplitudes in a Mountain Lake

by Adam Choiński^1,* and Agnieszka Strzelczak²

¹ Department of Hydrology and Water Management, Adam Mickiewicz University, Krygowskiego 10, 61-680 Poznań, Poland

² Faculty of Food Sciences and Fisheries, West Pomeranian University of Technology in Szczecin, Pawła VI 3, 71-459 Szczecin, Poland

Water 2018, 10(6), 795; https://doi.org/10.3390/w10060795 - 15 Jun 2018

Cited by 4 | Viewed by 4017

Abstract

This paper presents an analysis of the variability of short-term water temperature amplitudes in Lake Morskie Oko, situated in the Tatra Mountains National Park, which makes the human impact on the lake very limited. The objective of the study was to determine to [...] Read more.

This paper presents an analysis of the variability of short-term water temperature amplitudes in Lake Morskie Oko, situated in the Tatra Mountains National Park, which makes the human impact on the lake very limited. The objective of the study was to determine to what extent an increase in depth contributes to suppressing daily water temperature amplitudes. It was shown, among other things, that water temperature amplitudes were the lowest in the period of occurrence of the ice cover, higher in the period of occurrence of other (than ice cover) ice phenomena, and the highest in the case of their lack. The analysis of profiles of water temperature amplitudes (in the case of lack of ice phenomena) resulted in determination of their six types. A strong correlation was observed in which the effect of mean daily air temperature and the effect of wind on water level amplitudes are considerably lower during the occurrence of ice phenomena in comparison to the period when the water surface is free from such phenomena. It was demonstrated that the near-bottom waters in Lake Morskie Oko are very stable in terms of temperature. The short transition period from ice cover to free water surface was determined to be very important, because it constitutes a threshold in the effect of air temperature and wind on changes in thermal dynamics of water (in this case expressed in amplitude values). Finally, proposals are presented for future expansion of the scope of research on water temperature amplitudes. This work is important, because the amplitudes were investigated not only at the surface of the lake, but also at its bottom, and also during the ice cover period, when the lake was isolated from the atmospheric influences. This study may contribute to better understanding of the lake water temperature responses to climate change and thus to more accurate prediction these patterns in lake globally. Moreover, understanding of changes in water temperature is closely related to the variability of its heat resources, and these in the future may be used on a large scale. In the case of a mountain lake such as Morskie Oko, the heat of water may be used, for example, for heating tourist shelters. Full article

(This article belongs to the Section Hydrology)

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18 pages, 3937 KiB

Open AccessArticle

Navigating the Water-Energy Governance Landscape and Climate Change Adaptation Strategies in the Northern Patagonia Region of Argentina

by Laura Forni^1,*

, Marisa Escobar¹, Pablo Cello²

, Marta Marizza^2,3

, Gustavo Nadal⁴, Leonidas Girardin^4,5, Fernando Losano⁶, Lisandro Bucciarelli⁶, Charles Young¹ and David Purkey¹

¹ Stockholm Environment Institute, Davis, CA 95616, USA

² Facultad de Ingeniería y Ciencias Hídricas, Universidad Nacional del Litoral, Santa Fe 3000, Argentina

³ Facultad de Ingeniería, Universidad Nacional del Comahue, Neuquén 8300, Argentina

⁴ Fundación Bariloche, San Carlos, de Bariloche R8402AGP, Río Negro, Argentina

⁵ Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1425FQB CABA, Argentina

⁶ Autoridad Interjurisdiccional de las Cuencas de los ríos Limay, Neuquén y Negro (AIC), Cipolletti 8324, Río Negro, Argentina

Water 2018, 10(6), 794; https://doi.org/10.3390/w10060794 - 15 Jun 2018

Cited by 10 | Viewed by 6937

Abstract

Water scientists often find themselves interacting with decision-makers with varying levels of technical background. The sustainable management of water resources is complex by nature, and future conditions are highly uncertain, requiring modeling approaches capable of accommodating a variety of parameters and scenarios. Technical [...] Read more.

Water scientists often find themselves interacting with decision-makers with varying levels of technical background. The sustainable management of water resources is complex by nature, and future conditions are highly uncertain, requiring modeling approaches capable of accommodating a variety of parameters and scenarios. Technical findings from these analyses need to be positioned and conducted within the governance institutions to ensure decision-makers utilize them. This paper examines the water resource challenges for a large basin in northern Patagonia, Argentina and utilizes the Robust Decision Support (RDS) framework to evaluate trade-offs and strategies in a participatory process that included researchers and decision-makers. Integrated water resources models using simulation modeling and decision space visualization show significant climate change impacts, which are augmented with irrigated agriculture expansion and increasing hydropower production. Full article

(This article belongs to the Collection Water Policy Collection)

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21 pages, 1766 KiB

Open AccessArticle

Efficiency Evaluation of Water Consumption in a Chinese Province-Level Region Based on Data Envelopment Analysis

by Ping Hu^1,2, Na Chen¹, Yongjun Li^3,* and Qiwei Xie^2,*

¹ Faculty of Mathematics and Statistics, Hubei University, Wuhan 430062, China

² School of Economics and Management, Beijing University of Technology, Beijing 100000, China

³ School of Management, University of Science and Technology of China, Hefei 230000, China

Water 2018, 10(6), 793; https://doi.org/10.3390/w10060793 - 15 Jun 2018

Cited by 26 | Viewed by 5533

Abstract

Due to the large volume of sewage in China, the efficiency of water consumption evaluated by the traditional model may be inaccurate. This paper evaluates the water consumption efficiency more scientifically. First, this paper uses the CCR model to evaluate the resource efficiency [...] Read more.

Due to the large volume of sewage in China, the efficiency of water consumption evaluated by the traditional model may be inaccurate. This paper evaluates the water consumption efficiency more scientifically. First, this paper uses the CCR model to evaluate the resource efficiency and environmental efficiency separately. The latter is generally lower than the former, which means the issue of water pollution is more serious than the problem of water resource consumption. Then, the water consumption efficiency is integrally evaluated by an eco-inefficiency model which focuses on undesirable outputs. The results are in good agreement with the results of the CCR model: (1) Only Beijing, Tianjin, and Shanghai are eco-efficient in terms of water consumption, water consumption efficiency in the southeastern coastal areas is higher than in the Midwest, and the overall water environment is bad; (2) China needs to focus on reducing industrial wastewater; (3) the output of water consumption has a lot of room for improvement; and (4) the output improvement schemes of all provinces have some similarities and are related to many features. So, this paper has made a clustering analysis of the improvement schemes and given detailed suggestions for improving the eco-efficiency of water consumption in China according to the clustering result. Full article

(This article belongs to the Section Water Resources Management, Policy and Governance)

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27 pages, 5681 KiB

Open AccessArticle

Horizontal Circulation Patterns in a Large Shallow Lake: Taihu Lake, China

by Sien Liu^1,*

, Qinghua Ye^1,2

, Shiqiang Wu³ and Marcel J. F. Stive¹

¹ Department of Hydraulic Engineering, Delft University of Technology, 1, Stevinweg, 2628 CN Delft, The Netherlands

² Deltares, Boussinesqweg 1, 2629 HV Delft, The Netherlands

³ State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China

Water 2018, 10(6), 792; https://doi.org/10.3390/w10060792 - 15 Jun 2018

Cited by 25 | Viewed by 6651

Abstract

Wind induced hydrodynamic circulations play significant roles in the transport and mixing process of pollutants and nutrients in large shallow lakes, but they have been usually overlooked, while environmental, biological, and ecological aspects of eutrophication problems get the most focus. Herein we use [...] Read more.

Wind induced hydrodynamic circulations play significant roles in the transport and mixing process of pollutants and nutrients in large shallow lakes, but they have been usually overlooked, while environmental, biological, and ecological aspects of eutrophication problems get the most focus. Herein we use a three-dimensional model, driven by steady/unsteady wind, river discharge, rainfall, evaporation to investigate the spatially heterogeneous, large-scale hydrodynamic circulations and their role in transporting and mixing mechanisms in Taihu Lake. Wind direction and velocity determines the overall hydrodynamic circulation structure, i.e. direction, intensity, and position. A relative stable hydrodynamic circulation pattern has been formed shortly with steady wind (~2 days). Vertical profiles of horizontal velocities are linearly correlated to the relative shallowness of water depth. Volume exchange between subbasins, influenced by wind speed and initial water level, differs due to the complex topography and irregular shape. With unsteady wind, these findings are still valid to a high degree. Vertical variations in hydrodynamic circulation are important in explaining the surface accumulation of algae scums in Meiliang Bay in summers. Vorticity of velocity field, a key indicator of hydrodynamic circulation, is determined by wind direction, bathymetry gradient, and water depth. The maximum change of velocity vorticity happens when wind direction is perpendicular to bathymetry gradient. Furthermore, Lagrangian-based tracer transport is used to estimate emergency pollution leakage impacts, and also to evaluate operational management measurements, such as, the large-scale water transfer. The conclusion is that the large-scale water transfer does not affect the hydrodynamic circulation and volume exchanges between subbasins significantly, but succeeds to transport and then mix the fresh, clean Yangtze River water to a majority area of Taihu Lake. Full article

(This article belongs to the Section Hydraulics and Hydrodynamics)

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21 pages, 2411 KiB

Open AccessArticle

Assessing Environmental Flow Targets Using Pre-Settlement Land Cover: A SWAT Modeling Application

by Sean J. Zeiger^1,* and Jason A. Hubbart^2,3

¹ School of Natural Resources, University of Missouri, 203-T ABNR Building, Columbia, MO 65211, USA

² Institute of Water Security and Science, West Virginia University, 4121 Agricultural Sciences Building, Morgantown, WV 26506, USA

³ Davis College, Schools of Agriculture and Food, and Natural Resources, West Virginia University, 4121 Agricultural Sciences Building, Morgantown, WV 26506, USA

Water 2018, 10(6), 791; https://doi.org/10.3390/w10060791 - 15 Jun 2018

Cited by 13 | Viewed by 4799

Abstract

Determining environmental flow requirements to sustain aquatic ecosystem health remains a challenge. The purpose of this research was to quantify the extent of current flow alterations relative to baseline hydrologic conditions of a simulated historic flow regime prior to anthropogenic flow disturbance (i.e., [...] Read more.

Determining environmental flow requirements to sustain aquatic ecosystem health remains a challenge. The purpose of this research was to quantify the extent of current flow alterations relative to baseline hydrologic conditions of a simulated historic flow regime prior to anthropogenic flow disturbance (i.e., pre-settlement flows). Results allowed assessment of the efficacy of environmental flow targets based on pre-settlement land cover in a contemporary mixed-land-use catchment (i.e., urban, agricultural, and forested). Pre-settlement flows were simulated using the Soil and Water Assessment Tool (SWAT). Pre-settlement land cover, based on soil physical characteristics, was used to simulate pre-settlement flows with the SWAT model. Environmental flow targets were calculated for each flow element of a historic flow regime (magnitude, frequency, duration, timing, and rate of change). Urban (20% of watershed area) and agricultural development (42% of watershed area) were correlated to decreased median daily stream flow by 0.8 m³ s⁻¹ (percent difference = −115%), increased maximum daily flow by 22 m³ s⁻¹ (percent difference = 13%), and a 34% increase in daily flow variability. High flow frequency increased by 45–76% following development. Results highlight a need for consideration of environmental flow targets appropriate for watersheds already modified by existing land use, and point to a need for long-term, broad-scale, and persistent efforts to develop achievable environmental flow recommendations, particularly in rapidly urbanizing mixed-land-use watersheds. Full article

(This article belongs to the Section Water Resources Management, Policy and Governance)

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15 pages, 3113 KiB

Open AccessArticle

Adaptation Strategies of the Hydrosocial Cycles in the Mediterranean Region

by Ana Arahuetes^*, María Hernández

and Antonio M. Rico

Interuniversity Institute of Geography, University of Alicante, Ctra. San Vicente del Raspeig s/n, 03690 San Vicente del Raspeig, Spain

Water 2018, 10(6), 790; https://doi.org/10.3390/w10060790 - 15 Jun 2018

Cited by 15 | Viewed by 5059

Abstract

The Spanish Mediterranean region has been affected by several factors over the years (climatic conditions of aridity, high water demands, rapid and intense urban and population growth, climate change), that have generated a negative water balance whereby water resources are unable to meet [...] Read more.

The Spanish Mediterranean region has been affected by several factors over the years (climatic conditions of aridity, high water demands, rapid and intense urban and population growth, climate change), that have generated a negative water balance whereby water resources are unable to meet the demand. Diversifying supply sources by resorting to new resources has been a necessity that has stimulated the expansion and integration of non-conventional water sources (desalination and reuse of reclaimed water) and sustainable solutions. The aim of this paper is to evaluate the adaptation strategies that have been developed in Alicante, Benidorm and Torrevieja in order to adjust their hydrosocial cycles to development and future scenarios. The theoretical analysis developed in this paper is corroborated by the study of the hydrosocial cycle evolution of three cities in the southeast of Spain, and the adaptive measures that the different stakeholders involved in the cycle have developed in each of them. The input and output of the systems are accounted for with information provided by the management companies in each of the phases (urban consumption; treated, reused and desalinated volumes), which highlight how the diversification of resources and the incorporation of non-conventional resources have been essential for adaptation. Full article

(This article belongs to the Special Issue Selected Papers from the 1st International Electronic Conference on the Hydrological Cycle (ChyCle-2017))

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19 pages, 6997 KiB

Open AccessArticle

Spatio-Temporal Analysis of Meteorological Elements in the North China District of China during 1960–2015

by Jinsong Ti^1,2, Yuhao Yang^1,2, Xiaogang Yin^1,2, Jing Liang³, Liangliang Pu^1,2, Yulin Jiang^1,2, Xinya Wen^1,2 and Fu Chen^1,2,*

¹ College of Agronomy and Biotechnology, China Agricultural University, Yuan-Ming-Yuan West Road 2, Haidian, Beijing 100193, China

² Key Laboratory of Farming system, Ministry of Agriculture and Rural Affairs of the People’s Republic of China, Yuan-Ming-Yuan West Road 2, Haidian, Beijing 100193, China

³ Department of Environmental Sciences, University of California, 900 University Ave, Riverside, CA 92521, USA

Water 2018, 10(6), 789; https://doi.org/10.3390/w10060789 - 15 Jun 2018

Cited by 24 | Viewed by 4661

Abstract

The North China District (NCD) is one of the main grain production regions in China. The double cropping system of irrigation has been leading to the groundwater table decline at the speed of 1–2 m per year. Climate change leads to uncertainty surrounding [...] Read more.

The North China District (NCD) is one of the main grain production regions in China. The double cropping system of irrigation has been leading to the groundwater table decline at the speed of 1–2 m per year. Climate change leads to uncertainty surrounding the future of the NCD agricultural system, which will have great effects on crop yields and crop water demands. In this research, the Meteorological dataset from 54 weather station sites over the period 1960–2015 were collected to quantify the long-term spatial and temporal trends of meteorological data, including daily minimum temperature (T_min), maximum temperature (T_max), precipitation, solar radiation, reference evapotranspiration (ET₀), and aridity index (AI). The results show that the long-term wheat and maize growing season and annual average air temperatures (T_min and T_max) showed strong north to south increasing trends throughout the NCD. The average annual precipitation was 632.9 mm across the NCD, more than 70% of which was concentrated in the maize growing season. The regional average annual ET₀ was 1026.1 mm, which was 531.2 and 497.4 mm for the wheat and maize growing season, respectively. The regional precipitation decreased from northwest to southeast in each growing season and annual timescale. The funnel areas have lower precipitation and higher ET₀ than the regional average, which may lead to the mining of the groundwater funnel area. The regional average annual AI is 0.63, which lies in the humid class. For temporal analysis, the regional average trends in annual T_min, T_max, solar radiation, ET₀, precipitation, and AI were 0.37 °C/10a, 0.15 °C/10a, −0.28 MJ/day/m²/10a, −2.98 mm/10a, −12.04 mm/10a, and 0.005/10a, respectively. The increasing trend of temperature and the decreasing trend of solar radiation may have a negative effect on the regional food security. The funnel area AI showed a significant increasing trend for the winter wheat growing season and a decreasing trend for maize, which indicated that more irrigation will be needed for the maize growing season and the winter fallow policy may lead to the increasing trend precipitation being wasted. Analyzing the growing season and the annual meteorological elements of the spatiotemporal trends can help us better understand the influence of climate change on the natural resources and agricultural development in both the past and the future, and will provide us with invaluable information for the modification of cropping patterns to protect the regional and national water and food security. Full article

(This article belongs to the Section Water Use and Scarcity)

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19 pages, 7431 KiB

Open AccessArticle

Drought Prediction for Areas with Sparse Monitoring Networks: A Case Study for Fiji

by Jinyoung Rhee^*

and Hongwei Yang

Climate Services and Research Department, APEC Climate Center, Busan 48058, Korea

Water 2018, 10(6), 788; https://doi.org/10.3390/w10060788 - 14 Jun 2018

Cited by 15 | Viewed by 7086

Abstract

Hybrid drought prediction models were developed for areas with limited monitoring gauges using the APEC Climate Center Multi-Model Ensemble seasonal climate forecast and machine learning models of Extra-Trees and Adaboost. The models provide spatially distributed detailed drought prediction data of the 6-month Standardized [...] Read more.

Hybrid drought prediction models were developed for areas with limited monitoring gauges using the APEC Climate Center Multi-Model Ensemble seasonal climate forecast and machine learning models of Extra-Trees and Adaboost. The models provide spatially distributed detailed drought prediction data of the 6-month Standardized Precipitation Index for the case study area, Fiji. In order to overcome the limitation of a sparse monitoring network, both in-situ data and bias-corrected dynamic downscaling of historical climate data from the Weather Research Forecasting (WRF) model were used as reference data. Performance measures of the mean absolute error as well as classification accuracy were used. The WRF outputs reflect the topography of the area. Hybrid models showed better performance than simply bias corrected forecasts in most cases. Especially, the model based on Extra-Trees trained using the WRF model outputs performed the best in most cases. Full article

(This article belongs to the Special Issue Statistical Analysis and Stochastic Modelling of Hydrological Extremes)

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