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Advances in Hydrology and Hydraulics: Integrating Aquatic Biota and River Ecosystem Processes

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

Deadline for manuscript submissions: 1 August 2026 | Viewed by 1450

Special Issue Editor

Dr. Karol Plesiński

E-Mail Website
Guest Editor
Department of Hydrotechnic Engineering and Geotechnics, University of Agriculture in Krakow, Kraków, Poland
Interests: water engineering; water resources; hydraulic modeling; hydrodynamic modeling; sediment transport; open channel hydraulics; block ramp; fish pass; check-dam; geomorphologic fluvial
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is intended to serve as a collection of the latest works on the development of hydrology and hydraulics in connection with aquatic organisms and ecosystem processes of river systems. It is also intended to be a valuable review of the achievements and shortcomings in these fields, which can serve their further development.

This call is open to all research that concerns the following:

  1. River flow dynamics:
  • Analysis of river flows, including hydraulic modeling.
  • Research on the characteristics of unsteady flows and extreme hydrological phenomena (e.g., floods, droughts).
  • Changes in river flow due to climatic and anthropogenic changes.
  1. River basin hydrology:
  • The hydrological cycle at the river basin scale and its variability.
  • Recharge processes of surface and groundwater in the context of river systems.
  • Hydrological modeling of river basins—water flow, water balance.
  1. Sediment transport in rivers:
  • Research on the mechanisms of sediment transport in rivers.
  • The influence of erosion and sedimentation on the morphology of the river channel.
  • Modeling sediment transport and their impact on hydrotechnical infrastructure.
  1. Interactions of surface and groundwater:
  • Exchange processes between surface and groundwater in river ecosystems.
  • Modeling hydrodynamic interactions between groundwater and surface water.
  • The impact of these processes on water quality and biodiversity.
  1. Ecohydrology and environmental hydraulics:
  • The impact of hydrological changes on biodiversity and river ecosystems.
  • Sustainable management of aquatic ecosystems and protection against pollution.
  • River restoration projects and their impact on water flows and quality.
  1. Renaturation and revitalization of rivers:
  • Planning, implementation and assessment of renaturation/revitalization measures (e.g., re-meandering, floodplain reconnection, riparian restoration, nature-based solutions).
  • Evaluation of hydromorphological, hydraulic and ecological outcomes of restoration interventions, including long-term monitoring.
  • Renaturation and revitalization in urban and heavily modified rivers, balancing flood risk reduction, ecosystem services and stakeholder needs.
  1. Aquatic organisms:
  • Responses of fish, macroinvertebrates, aquatic vegetation and microbial communities to changes in flow regime, sediment transport, temperature and water quality.
  • Ecohydraulic habitat assessment and modeling (e.g., habitat suitability, environmental flows, ecological connectivity).
  • The effects of barriers (dams, weirs) and river regulation on migration, reproduction and community structure, including mitigation measures.

Dr. Karol Plesiński
Guest Editor

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 250 words) can be sent to the Editorial Office for assessment.

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

  • hydraulics
  • hydrology
  • river system
  • aquatic organisms
  • ecosystem processes
  • numerical and physical modeling
  • hydrotechnics
  • geomorphologic
  • sediment transport
  • climate changes

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

Published Papers (2 papers)

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Research

20 pages, 7754 KB  
Article
Effects of Channel Modification and Precipitation on Fish Habitat in a Small Watershed: A Case Study of Gaoliao Creek in Taiwan
by Tung-Jer Hu, Hsiang-Yi Hsu, Chi-Rong Chung, Shang-Hao Wu and Cho-Han Yeh
Water 2026, 18(12), 1400; https://doi.org/10.3390/w18121400 - 8 Jun 2026
Viewed by 126
Abstract
This study developed a novel framework integrating UAV-derived orthophotography, deep learning-based substrate classification, two-dimensional hydraulic modeling, Froude number (Fr) analysis, and multispecies habitat suitability assessment to evaluate the effects of channel modification and precipitation on fish habitats in Gaoliao Creek, eastern [...] Read more.
This study developed a novel framework integrating UAV-derived orthophotography, deep learning-based substrate classification, two-dimensional hydraulic modeling, Froude number (Fr) analysis, and multispecies habitat suitability assessment to evaluate the effects of channel modification and precipitation on fish habitats in Gaoliao Creek, eastern Taiwan. Habitat changes under baseflow and rainfall-induced high-flow conditions were quantified using Fr-based hydraulic habitat availability and Habitat Suitability Index (HSI)- and Combined Habitat Suitability Index (CHSI)-based habitat suitability. Channel modification transformed the channel from a deep and slow-flowing system into a shallower and faster-flowing environment. Under baseflow conditions, the proportion of available habitat meeting the adopted hydraulic criteria decreased from 81.6% to 73.9%, whereas the CHSI-derived proportion of weighted usable area (PUA) increased from 0.300 to 0.323 due to favorable substrate composition. During rainfall events, habitat availability and suitability declined markedly during peak flows and recovered as discharge receded. Compared with the pre-engineering channel, the modified channel exhibited greater sensitivity to short-term hydrological fluctuations but effectively prevented overbank flooding during the selected extreme rainfall event. These findings highlight the trade-off between flood-control benefits and ecological resilience and emphasize the importance of maintaining habitat heterogeneity in river management. Because the analyses were based on a single typhoon-related rainfall event and lacked direct biological validation, the results should be interpreted as event-specific predictions requiring further verification. Full article
(This article belongs to the Special Issue Advances in Hydrology and Hydraulics: Integrating Aquatic Biota and River Ecosystem Processes)
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26 pages, 12014 KB  
Article
The Reliability of SBR System During COVID-19 and Its Impact on Water Quality of a Small Flysch River in Protected Areas
by Ewa Dacewicz, Karol Plesiński and Ewa Łobos-Moysa
Water 2026, 18(9), 1096; https://doi.org/10.3390/w18091096 - 2 May 2026
Viewed by 1020
Abstract
This study assessed the impact of pandemic-related changes in treated wastewater on surface water quality and ecological status of the Raba River within the Natura 2000 site. Particular attention to the reliability of the Kasinka Mała wastewater treatment plant operating in this protected [...] Read more.
This study assessed the impact of pandemic-related changes in treated wastewater on surface water quality and ecological status of the Raba River within the Natura 2000 site. Particular attention to the reliability of the Kasinka Mała wastewater treatment plant operating in this protected area during the two study periods—pre-pandemic (PP) and COVID-19 (CP)—was given. For this purpose, current standard monitoring methods (ecological status of a small flysch stream, existing and potential threats to the Natura 2000 site) and extended monitoring methods (river’s utility values, technological reliability of the treatment plant operating with SBR technology, reliability rating of the river as a sewage receiver) were used. The results indicated that biodegradable carbon compounds (as dissolved and suspended forms) and ammonium nitrogen were the dominant factors determining water quality. Their presence reduced the Raba River’s utility value—determined by what is required of surface water treatment—by at least one class. During the CP, the reliability analysis showed that the river remained in a reduced class for 145 days due to elevated BOD5 and nearly one-third of the year due to elevated TSS levels. For approximately half of the year, ammonium nitrogen concentrations exceeded the threshold of 1.8 mg·dm−3, thereby further reducing the class of water quality. Technological reliability of the WWTP during PP for BOD5, COD, TSS, NH4+–N, and PO4−3–P was 43%, 100%, 30%, 86%, and 100%, respectively. This means that permitted values of COD and PO4−3–P were maintained. The exceedances of limits concerned BOD5 (25 mg O2·dm−3 for 208 days), TSS (35 mg·dm−3 for 256 days), and NH4+–N (15 mg·dm−3 for 51 days). During CP, the technological reliability of the WWTP decreased rapidly for the following pollutants to 5%, 18%, 18%, 30%, and 89%, respectively. This means that permissible concentrations of BOD5 (25 mg O2·dm−3 for 347 days), COD (125 mg O2·dm−3 for 241 days), TSS (35 mg·dm−3 for 299 days), NH4+–N (15 mg·dm−3 for 256 days), and PO4−3–P (2 mg·dm−3 for 40 days) were exceeded. A two-year monitoring campaign has shown that small flysch rivers receiving treated wastewater may experience prolonged changes in water quality under conditions of increased anthropopressure. Effective ecosystem protection should, therefore, include extended monitoring and stricter management of BOD5, TSS, and NH4+–N in SBR systems in protected areas. Full article
(This article belongs to the Special Issue Advances in Hydrology and Hydraulics: Integrating Aquatic Biota and River Ecosystem Processes)
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