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Advances in Hydraulic and Water Resources Research (3rd Edition)
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Advances in Hydraulic and Water Resources Research (3rd Edition)

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Hydraulics and Hydrodynamics".

Deadline for manuscript submissions: 30 September 2025 | Viewed by 1941

Special Issue Editors

Prof. Dr. Majid Mohammadian

E-Mail Website
Guest Editor
Department of Civil Engineering, University of Ottawa, 161 Louis Pasteur, A114, Ottawa, ON K1N 6N5, Canada
Interests: computational fluid dynamics; turbulent mixing; outfall systems and sustainable design; numerical modeling of riverine and coastal waters; jets and plumes and environmental sustainability; sediment transport
Special Issues, Collections and Topics in MDPI journals
Dr. Xiaohui Yan

E-Mail Website
Guest Editor
Water Resources Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China
Interests: CFD coding; turbulence; turbulence modeling; turbulent flow; computational fluid dynamics; CFD Simulation; numerical simulation; computational fluid mechanics; numerical modeling; fluent
Special Issues, Collections and Topics in MDPI journals
Dr. Hossein Kheirkhah Gildeh

E-Mail Website
Guest Editor
1. Department of Civil Engineering, University of Ottawa, 161 Louise Pasteur, Ottawa, ON K1N 6N5, Canada
2. Water Resources Engineer, Barr Engineering Co., 808 4 Avenue SW, Calgary, AB T2P 3E8, Canada
Interests: environmental fluid mechanic; river engineering; coastal engineering; computational fluid dynamics (CFD); effluent discharge; near-field and far-field mixing; dam breach analysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hydraulic engineering methods can be applied to a wide range of research problems, including coastal engineering, river engineering, and lake modeling. This Special Issue aims to present numerical, field, and laboratory studies related to the topics mentioned above. The scope of this Special Issue includes, but is not limited to, the following topics: sediment transport, waves, the transport of pollutants, hydraulic structures, coastal structures, coastal erosion, coastal flow simulation, dam breach analysis, mine water management, stream restoration and lake modeling.

Prof. Dr. Majid Mohammadian
Dr. Xiaohui Yan
Dr. Hossein Kheirkhah Gildeh
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • modeling
  • lab studies
  • field studies
  • coastal engineering
  • river engineering
  • lakes

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Further information on MDPI's Special Issue policies can be found here.

Related Special Issues

Published Papers (4 papers)

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Research

15 pages, 2215 KiB  
Article
Laboratory Experiments on Reflected Gravity Currents and Implications for Mixing
by Maria Rita Maggi and Claudia Adduce
Water 2025, 17(7), 1062; https://doi.org/10.3390/w17071062 - 3 Apr 2025
Viewed by 275
Abstract
When a gravity current encounters a barrier, it is reflected as a moving hydraulic jump or bore. These reflected flows, which play a significant role in estuarine mixing and sediment transport, are often simplified in theoretical models as purely advective processes with no [...] Read more.
When a gravity current encounters a barrier, it is reflected as a moving hydraulic jump or bore. These reflected flows, which play a significant role in estuarine mixing and sediment transport, are often simplified in theoretical models as purely advective processes with no mixing and dilution effects. This study explores the dynamics of gravity currents fully blocked by various inclined barriers, focusing on the resulting mixing behavior. Using an image analysis technique based on light attenuation to capture instantaneous density fields, we reveal how the presence of a barrier influences the current even before impact. By applying the Thorpe scale to assess turbulent mixing, we show that a barrier’s geometry significantly affects mixing intensity. Notably, this study finds that barriers can increase the local turbulent mixing compared to horizontal surfaces. Full article
(This article belongs to the Special Issue Advances in Hydraulic and Water Resources Research (3rd Edition))
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19 pages, 10034 KiB  
Article
Probability Distribution Functions of Velocity Fluctuations and Quadrant Analysis on Turbulent Flow Around a Horizontal Cylinder Across a Channel Bed
by Sandeep Kumar, Bimlesh Kumar, Jaan H. Pu and Prashanth Reddy Hanmaiahgari
Water 2025, 17(7), 958; https://doi.org/10.3390/w17070958 - 25 Mar 2025
Viewed by 290
Abstract
An experiment is conducted to investigate the turbulent flow field close to a wall-fastened horizontal cylinder. The evolution of the flow field is analyzed by evaluating turbulent flow characteristics and fluid dynamics along the lengthwise direction. The approach flow velocity retards in the [...] Read more.
An experiment is conducted to investigate the turbulent flow field close to a wall-fastened horizontal cylinder. The evolution of the flow field is analyzed by evaluating turbulent flow characteristics and fluid dynamics along the lengthwise direction. The approach flow velocity retards in the immediate upstream area of the cylinder. At the crest level of the cylindrical pipe, the turbulence characteristics such as Reynolds stresses and turbulence intensities are attaining their peaks. Gram–Charlier (GC) series-based Hermite polynomials yield probability density functions that better match experimental data than those from Gram–Charlier (GC) series-based exponential distributions, demonstrating the superiority of the Hermite polynomial method. Quadrant analysis reveals that sweeps (Q4) dominate intermediate and free-surface zones, while ejections (Q2) prevail near the bed, both being primary contributors to Reynolds shear stress (RSS). The stress component remains minimal or zero for all events when hole size H≥six. Larger hole sizes (≥five) drastically reduced the stress fraction, approaching zero. The stress fraction was highest near the cylinder, decreasing with distance and eventually plateauing. The study enhances the understanding of flow hydraulics around cylindrical objects in rough-bed natural streams. Full article
(This article belongs to the Special Issue Advances in Hydraulic and Water Resources Research (3rd Edition))
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21 pages, 5997 KiB  
Article
Analysis of the Impacts of Geometric Factors on Hydraulic Characteristics and Pollutant Transport at Asymmetric River Confluences
by Xu Wang, Na Xu, Jiening Yang, Fan Wang, Peixuan Li, Xiangkun Yang and Xiaojun Shen
Water 2025, 17(6), 836; https://doi.org/10.3390/w17060836 - 14 Mar 2025
Viewed by 311
Abstract
Asymmetrical river confluence zones play a critical role in water quality protection and remediation. This study develops a three-dimensional numerical model to simulate the hydraulic characteristics and contaminant dispersion processes within river channels. The results indicate that variations in the two geometric factors—the [...] Read more.
Asymmetrical river confluence zones play a critical role in water quality protection and remediation. This study develops a three-dimensional numerical model to simulate the hydraulic characteristics and contaminant dispersion processes within river channels. The results indicate that variations in the two geometric factors—the confluence angle and elevation difference—can produce a range of effects. Under the combined influence of these factors, the trajectory line at the pollutant-mixing interface follows a “logarithmic” growth pattern. As indicated by the inhomogeneity index, an increase in the junction angle and elevation difference significantly accelerates the mixing rate of pollutants and enhances dispersion. These insights suggest that, in cases with large confluence angles and significant elevation variations, intense mixing of water flow facilitates the rapid transport and extensive dispersion of pollutants, which may help reduce localized pollution loads. These findings are crucial for developing effective water environment management strategies. Full article
(This article belongs to the Special Issue Advances in Hydraulic and Water Resources Research (3rd Edition))
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20 pages, 6289 KiB  
Article
Spatiotemporal Prediction of Tidal Fields in a Semi-Enclosed Marine Bay Using Deep Learning
by Zuhao Zhu, Xiaohui Yan, Zhuo Wang and Sidi Liu
Water 2025, 17(3), 386; https://doi.org/10.3390/w17030386 - 31 Jan 2025
Viewed by 711
Abstract
The prediction of tidal fields is crucial in coastal and marine hydrodynamic analyses, particularly in complex tidal environments, as it plays an essential role in disaster warning and fisheries management. However, monitoring the entire tidal field is impractical, and harmonic analysis and numerical [...] Read more.
The prediction of tidal fields is crucial in coastal and marine hydrodynamic analyses, particularly in complex tidal environments, as it plays an essential role in disaster warning and fisheries management. However, monitoring the entire tidal field is impractical, and harmonic analysis and numerical simulation methods continue to face challenges in accuracy and efficiency for large-scale predictions. To address these issues, this paper proposes a tidal field prediction method based on Long Short-Term Memory (LSTM) networks. A physics-based hydrodynamic model is established, and the numerical model is validated using observational data from multiple sites in the study area. The accuracy is quantified using performance indicators such as root mean square error (RMSE) and correlation coefficients. The validated numerical model is then used to generate a high-quality comprehensive dataset. An LSTM-based model is then developed to predict tidal fields in a semi-closed marine bay. The performance of the LSTM-based model is compared with models developed using Transformer, Random Forest, and KNN regression methods. The results demonstrate that the LSTM-based model surpasses the other machine learning models in prediction accuracy, with a notable advantage in handling time series field data. This study introduces new ideas and technical approaches for rapid tidal field prediction, overcoming the limitations of traditional methods and providing robust support for coastal disaster prevention, resource management, and environmental protection. Full article
(This article belongs to the Special Issue Advances in Hydraulic and Water Resources Research (3rd Edition))
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