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Water publishes Special Issues to create collections of papers on specific topics, with the aim of building a community of authors and readers to discuss the latest research and develop new ideas and research directions. Special Issues are led by Guest Editors, who are experts on the topic and all Special Issue submissions follow MDPI's standard editorial process. The journal’s Editor-in-Chief and/or designated Editorial Board Member will oversee Guest Editor appointments and Special Issue proposals, checking their content for relevance and ensuring the suitability of the material for the journal. The papers published in a Special Issue will be collected and displayed on a dedicated page of the journal’s website. Further information on MDPI's Special Issue policies and Guest Editor responsibilities can be found here. For any inquiries related to a Special Issue, please contact the Editorial Office.

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Freshwater Ecosystems—Biodiversity and Protection: 3rd Edition

edited by

Dubravka Čerba

Filip Stević

and

Maja Raković

submission deadline 28 Feb 2027 | Viewed by 52 | Submission Open

Keywords: freshwater communities; α, β, γ diversity; biotic indicators; water quality assessment; anthropogenic influence; ecotoxicology; metacommunity; invasive species; non-wadeable rivers; conservation; barcoding

(This special issue belongs to the Section Biodiversity and Functionality of Aquatic Ecosystems)

Source Tracing, Safety Early Warning and Risk Control of Emerging Pollutants in Soil-Groundwater System

edited by

Ruihui Chen

and Jin Wu

submission deadline 28 Feb 2027 | Viewed by 51 | Submission Open

Keywords: soil–groundwater system; remote-sensing interpretation; deep-learning algorithms; heavy metals; emerging pollutants; pollutant source tracing; safety early warning; risk control; cross-domain environmental management

(This special issue belongs to the Section Water Quality and Contamination)

Water–Energy–Food Nexus: Integrated Solutions for Sustainability

edited by Zheng Wu and

Guiliang Tian

submission deadline 15 Mar 2027 | Viewed by 140 | Submission Open

Keywords: water–energy–food nexus; nexus modelling and optimization; trade-offs and synergies; resource efficiency; climate resilience; virtual water and embodied energy; digital decision support; integrated solutions for sustainability

(This special issue belongs to the Section Water-Energy Nexus)

Performance Optimization of Biochar-Based Treatment Systems for Water and Wastewater Purification

edited by

Chia Yang Chen

submission deadline 15 Mar 2027 | Viewed by 48 | Submission Open

Keywords: biochar; water and wastewater treatment; performance optimization; engineered biochar; emerging contaminants; adsorption; nutrient recovery; resource recovery; circular economy; sustainable water management

(This special issue belongs to the Section Wastewater Treatment and Reuse)

Water Pollution Assessment and Removal of Emerging Contaminants

edited by

Xiaozhong Gao

and Na Li

submission deadline 15 Mar 2027 | Viewed by 35 | Submission Open

Keywords: emerging contaminants; passive sampling and screening; environmental exposure and fate; ecological risk assessment; contaminant removal; antimicrobial resistance; water biosecurity; microbial ecology; biotransformation and degradation

(This special issue belongs to the Section Water Quality and Contamination)

Impacts of Climate Change & Human Activities on Wetland Ecosystems, 2nd Edition

edited by Zhongqing Yan, Guopeng Liang, Yingxin Shang and Xueping Wang

submission deadline 20 Mar 2027 | 1 articles | Viewed by 948 | Submission Open

Keywords: wetland ecosystems; ecosystem services and functions; protection and restoration; climate change and human activities; wetland hydrological processes; greenhouse gas (GHGs) fluxes; nutrient cycle and energy flow; water environment quality

(This special issue belongs to the Section Water and Climate Change)

Hydrological Impacts on Geological Hazards: Mechanisms, Modeling, and Early Warning

edited by Wei Shao,

Zongji Yang

and

Wen Nie

submission deadline 20 Mar 2027 | 1 articles | Viewed by 905 | Submission Open

Keywords: hydrology–geohazard interactions; rainfall-induced landslides; pore water pressure; permafrost degradation; hydro-mechanical coupling; early warning; data assimilation; climate change

(This special issue belongs to the Section Hydrogeology)

Ecotoxicological Effects of Microplastics on Aquatic Species

edited by

Long Kong

and

Chunzhen Fan

submission deadline 20 Mar 2027 | Viewed by 288 | Submission Open

Keywords: ecotoxicological effects; microplastics; aquatic species; aquatic environments

(This special issue belongs to the Section Water Quality and Contamination)

Sustainable Environmental Planning and Management of Urban Water Infrastructures and Water Resources

edited by

António Manuel Abreu Freire Diogo

submission deadline 20 Mar 2027 | Viewed by 156 | Submission Open

Keywords: water resources management; urban water infrastructures; water supply systems and distribution networks; sewerage systems and urban stormwater networks; planning design and rehabilitation of water infrastructures; water quality and public health; advances in water treatment; wastewater treatment and reuse; smart urban water management; low impact development (LID); life cycle assessment (LCA); environmental sustainability

(This special issue belongs to the Section Urban Water Management)

Application of Isotopes in Hydrological and Hydrogeological Studies

edited by

Fengtian Yang

and Xiaodong He

submission deadline 20 Mar 2027 | Viewed by 61 | Submission Open

Keywords: moisture sources; water balancing; groundwater flow; hydrometric survey; origin of geofluid/solutes; contamination source tracking; degradation mechanism of contaminants; water-rock interaction

(This special issue belongs to the Section Hydrogeology)

Integrated Hydrologic Modeling and Data-Driven Decision Support

edited by

Seonggyu Park

and

Heechan Han

submission deadline 20 Mar 2027 | Viewed by 53 | Submission Open

Keywords: integrated hydrologic modeling; process-based modeling; data-driven analysis; decision support; uncertainty analysis

(This special issue belongs to the Section Hydrology)

Circular Water Solutions: Sustainable Treatment, Biowaste Valorization, and Advanced Materials

edited by

Sónia Figueiredo

Olga Matos de Freitas

and

Marta Otero

submission deadline 20 Mar 2027 | Viewed by 15 | Submission Open

Keywords: circular water solutions; sustainable water treatment; biowaste valorization; advanced materials for water treatment; water reuse and historical perspectives; nutrient removal and recycling; resource and energy recovery; micropollutants; PFAS; microplastics

(This special issue belongs to the Section Wastewater Treatment and Reuse)

Groundwater Contamination: From Source Identification to Remediation Strategies

edited by

Mitja Janža

submission deadline 20 Mar 2027 | Submission Open

Keywords: groundwater contamination; groundwater quality; groundwater management; groundwater protection; source identification; groundwater monitoring; numerical modelling; remediation planning; water resource management

(This special issue belongs to the Section Hydrogeology)

Hydrodynamics Science Experiments and Simulations, 3rd Edition

edited by

and

submission deadline 25 Mar 2027 | 5 articles | Viewed by 3472 | Submission Open

Keywords: hydrodynamic experiment; hydrodynamic simulation; hydraulic machinery; multiphase flow; hydro energy technology

(This special issue belongs to the Section Hydraulics and Hydrodynamics)

Intelligent Regulation and Adaptive Management of Complex River Basin Systems

edited by Yu Zhang

submission deadline 25 Mar 2027 | 3 articles | Viewed by 2401 | Submission Open

Keywords: river basin socio-hydrological system; extreme hydrological events and non-stationarity (extreme rainstorms/droughts); three-waters coupling (water resources–environment–ecology); intelligent adaptive management; reservoir–lake–river system; digital twin and AI technologies; climate-adaptive water resource allocation

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

Application of Remote Sensing and GIS in Water Resources

edited by

Min-Cheng Tu

Hong-Yuan Huo

and

James Deemy

submission deadline 25 Mar 2027 | 1 articles | Viewed by 1613 | Submission Open

Keywords: GIS; remote sensing; hydrology; satellite; drone; surface water; groundwater; cryosphere; flood; drought; rainfall-runoff; water quality; irrigation

(This special issue belongs to the Section New Sensors, New Technologies and Machine Learning in Water Sciences)

Water Quality Studies: Assessing the Presence of Nutrients and Pollutants, 2nd Edition

edited by

Sara Lehmann-Konera

and Joanna Potapowicz

submission deadline 25 Mar 2027 | 1 articles | Viewed by 1139 | Submission Open

Keywords: transboundary pollutants; persistent compounds; bioaccumulative chemicals; toxic contaminants; trace elements; major ions; organic compounds; catchment; freshwater; runoff and discharge; climate change impact

(This special issue belongs to the Section Water Quality and Contamination)

Evaluation of Microbiological Indicators for Water and Wastewater Treatment and Reuse, 2nd Edition

edited by

Anna Lenart-Boroń

submission deadline 25 Mar 2027 | 1 articles | Viewed by 915 | Submission Open

Keywords: antibiotic resistance; bacteria; drinking water; fungi; health risks; irrigation; microbiological contamination; protozoa; treatment plants; viruses; wastewater treatment; water pollution; water reuse

(This special issue belongs to the Section Wastewater Treatment and Reuse)

Research on Biological Wastewater Treatment and Reuse

edited by

Jagdeep Kumar Nayak

, Abdullah Al-Mamun and

Kundan Samal

submission deadline 25 Mar 2027 | Viewed by 53 | Submission Open

Keywords: biological wastewater treatment; water reuse; resource recovery; anaerobic digestion; bioelectrochemical systems; nutrient recovery; environmental biotechnology; circular bioeconomy; emerging contaminants; process intensification

(This special issue belongs to the Section Wastewater Treatment and Reuse)

Heavy Metal Pollution in Watersheds: Environmental Processes, Pollution Control, and Resource Recovery

edited by Zihan Wang and

Daying Chen

submission deadline 25 Mar 2027 | Viewed by 50 | Submission Open

Keywords: heavy metal pollution; watershed management; freshwater sediments; environmental processes; risk assessment; remediation; resource recovery

(This special issue belongs to the Section Water Quality and Contamination)

Advanced Oxidation Technologies for Water and Wastewater Treatment, 2nd Edition

edited by

Qiao Wang

, Huarui Li and Jialin Jia

submission deadline 25 Mar 2027 | Viewed by 48 | Submission Open

Keywords: advanced oxidation technologies; water treatment; pollutant removal; catalyst design; oxidation mechanisms

(This special issue belongs to the Section Wastewater Treatment and Reuse)

Advances in Blue–Green Infrastructure and Emerging Pollutant Monitoring Method for Climate-Resilient Urban Water Systems

edited by Sergio Santana-Viera and

Izabela Godyń

submission deadline 25 Mar 2027 | Viewed by 37 | Submission Open

Keywords: blue–green infrastructure; rainwater management; urban resilience; nature-based solutions; urban flooding; ecosystem services; economic incentives; cost–benefit analysis; life-cycle cost analysis

(This special issue belongs to the Section Urban Water Management)

Advancing Applications in Hydrogeochemical Processes in Groundwater Systems, 2nd Edition

edited by

Jason Polk

and Nenad Marić

submission deadline 25 Mar 2027 | Viewed by 32 | Submission Open

Keywords: groundwater systems; hydrogeochemical processes; hydrochemistry; isotopic and geochemical tracing; emerging contaminants and water quality concerns; karst hydrology; predictive modeling; water resource management

(This special issue belongs to the Section Hydrology)

Hydroclimate Risk Assessment and Management: Data, Models and Remote Sensing Approaches

edited by

Md Shahid Latif

Shaik Rehana

and

Fatih Tosunoğlu

submission deadline 31 Mar 2027 | 2 articles | Viewed by 1450 | Submission Open

Keywords: hydroclimate risk and extremes; climate change; CMIP5/CMIP6 and regional projections; remote sensing; reanalysis and in situ observations; hydrological; hydraulic; groundwater and socio-hydrological modelling; floods; droughts; heatwaves; wildfires and compound events; downscaling; bias adjustment and data assimilation; machine learning; deep learning and hybrid modelling; multi-hazard impact modelling and climate services; water–energy–food–ecosystem nexus; adaptation; resilience and decision-support systems; AI applications in improving hydroclimato-logical forecasting; flood; drought; water quality assessment

(This special issue belongs to the Section Hydrology)

Microplastics in the Marine Environment: Distribution and Effects

edited by

Chrysi Papadimitriou

submission deadline 31 Mar 2027 | 1 articles | Viewed by 942 | Submission Open

Keywords: microplastics; marine pollution; ecotoxicology; environmental fate; trophic transfer

(This special issue belongs to the Section Oceans and Coastal Zones)

Reactions of Hydrogen with Inorganic and Organic Molecules in Aqueous Media

edited by

Ignat Ignatov

, Yordan G. Marinov and

Teodora Todorova

submission deadline 31 Mar 2027 | 1 articles | Viewed by 346 | Submission Open

Keywords: inorganic and organic substrates; hydrogen reactions; catalysis (homogeneous and heterogeneous); green chemistry; hydrogen activation; origin of life; sustainable chemistry; environmental catalysis; renewable energy; redox processes; biocatalysis; electrocatalysis; prebiotic chemistry

(This special issue belongs to the Section Water Quality and Contamination)

Remote Sensing for Aquatic Environments: Applications, Innovations, and Future Perspectives

edited by

Hui Li

submission deadline 31 Mar 2027 | Viewed by 307 | Submission Open

Keywords: remote sensing; aquatic environments; water quality monitoring; chlorophyll-a; harmful algal blooms; optical complexity; algorithm development

(This special issue belongs to the Section New Sensors, New Technologies and Machine Learning in Water Sciences)

Advances in Hydrochemistry and Hydrogeology

edited by Shouchuan Zhang,

Shen Qu

and

Xiaoliang Sun

submission deadline 31 Mar 2027 | Viewed by 143 | Submission Open

Keywords: hydrogeology; hydrochemistry; isotope; numerical modeling; machine learning; thermal water

(This special issue belongs to the Section Hydrogeology)

Advances in Dam Engineering Innovations in Safety Monitoring and Sustainable Reinforce-Ment Technologies

edited by

Binghan Xue

Yantao Zhu

and

Manjun Li

submission deadline 31 Mar 2027 | Viewed by 71 | Submission Open

Keywords: risk analysis and management; seismic safety assessment; AI-based intelligent sensing; safety monitoring; remediation and reinforcement materials; sustainable dam construction

(This special issue belongs to the Section Hydraulics and Hydrodynamics)

Intelligent Sensing Methods and Safety Monitoring Theories in Water Engineering

edited by

Chunhui Ma

Lin Cheng

and

Jie Yang

submission deadline 31 Mar 2027 | Viewed by 65 | Submission Open

Keywords: water engineering safety; hydraulic engineering; hydraulic structure safety; water quality safety; safety monitoring; satellite remote sensing; intelligent sensing; monitoring data analysis; artificial intelligence; risk assessment

(This special issue belongs to the Section New Sensors, New Technologies and Machine Learning in Water Sciences)

Machine Learning and Artificial Intelligence for Groundwater Assessment and Sustainable Management

edited by

Hanxiang Xiong

Xu Guo

and Chuanming Ma

submission deadline 31 Mar 2027 | Viewed by 52 | Submission Open

Keywords: groundwater; machine learning; artificial intelligence; causal machine learning; groundwater quality; ground-water forecasting; groundwater storage; explainable AI; physics-informed learning; uncertainty analysis; sustainable groundwater management

(This special issue belongs to the Section Hydrogeology)

Advances in Water and Wastewater Quality Analysis and Treatment Technologies

edited by

Muhammad Zeeshan

submission deadline 31 Mar 2027 | Viewed by 46 | Submission Open

Keywords: emerging pollutants; advanced oxidation processes; adsorption; membrane filtration; resource recovery; sustainable water treatment; per- and polyfluoroalkyl substances (PFASs); microplastics; water reuse

(This special issue belongs to the Section Wastewater Treatment and Reuse)

Biodiversity Indicators in Lakes: Integrating Paleolimnological, Contemporary and Future Insights

edited by Yafei Zou,

Shengrui Zhang

and Yuan Li

submission deadline 31 Mar 2027 | Viewed by 12 | Submission Open

Keywords: biodiversity; lakes; diatoms; pollen; cladocerans; microfossils; global change; paleolimnology; limnology; ecosystem function; climate change; ecological response; water quality; taxonomy; barcoding and genomics

(This special issue belongs to the Section Biodiversity and Functionality of Aquatic Ecosystems)

Innovations in Integrated Aquaculture and Aquaponics

edited by Aya S. Hussain and

Abhinav Choudhury

submission deadline 20 Apr 2027 | 1 articles | Viewed by 400 | Submission Open

Keywords: integrated aquaculture; aquaponics; nutrient recycling; sustainable food systems; recirculating aquaculture systems (RAS); circular bioeconomy; water use efficiency; climate smart aquaculture

(This special issue belongs to the Section Water, Agriculture and Aquaculture)

Advances in Drinking Water Treatment: Coagulation, Flocculants, and Membrane Separation

edited by

Shuang Zhao

submission deadline 20 Apr 2027 | Viewed by 120 | Submission Open

Keywords: drinking water treatment; coagulation; flocculant; membrane separation; membrane fouling

(This special issue belongs to the Section Wastewater Treatment and Reuse)

Innovations in Water Sciences for Managing Water-Related Risks and Vulnerable Water Systems

edited by

Athanasios Loukas

submission deadline 25 Apr 2027 | Viewed by 178 | Submission Open

Keywords: hydrology; climate change; groundwater; surface water; water resources quality; urban and agricultural water systems; water resources management; policy and governance; extreme hydrometeorological events; ecosystems conservancy; wastewater treatment and reuse

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

Water and Environment for Sustainability

edited by

Fang Yenn Teo

, Selvam Sivathass Bannir and

Anurita Selvarajoo

submission deadline 30 Apr 2027 | 2 articles | Viewed by 2661 | Submission Open

Keywords: hydrology and water resources; rivers, lakes, estuaries, and seas; extreme events and climate change; water supply and wastewater treatment; environmental pollution and protection; sustainable technology and engineering; sustainable development goals; sustainable environment

(This special issue belongs to the Section Hydrology)

Advances of Multiphase Flow in Hydraulic and Marine Engineering

edited by Wei Liu,

Ling Zhou

and

Yuquan Zhang

submission deadline 30 Apr 2027 | 2 articles | Viewed by 1547 | Submission Open

Keywords: multiphase flow; CFD modeling; air–water flow; cavitation; sediment transport; wave–structure interaction; subsea oil–gas–water flow; hydraulic structures; marine engineering

(This special issue belongs to the Section Hydraulics and Hydrodynamics)

Marine Ecosystems Under Multiple Stressors: Climate Change and Other Anthropogenic Pressures

edited by

Md Khurshid Alam Bhuiyan

and Md Masum Billah

submission deadline 30 Apr 2027 | Viewed by 281 | Submission Open

Keywords: ecosystem functioning; ecological resilience; ocean acidification; marine heatwaves; marine pollution; fossil-fuel-related activities; ecological thresholds; coastal and transitional ecosystems; cumulative impacts; ecosystem restoration

(This special issue belongs to the Section Biodiversity and Functionality of Aquatic Ecosystems)

Water–Food Nexus: Integrating Plant Physiology, Water Resource Management, and Sustainable Agriculture

edited by Zeeshan Ahmed

submission deadline 30 Apr 2027 | Viewed by 101 | Submission Open

Keywords: crop resilience; food security; plant–water relations; physiological adaptation; precision irrigation; sustainable agriculture; water management

(This special issue belongs to the Section Water, Agriculture and Aquaculture)