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Techniques for Coastal Aquifer Management and Seawater Intrusion Characterization

A Special Issue of Water (ISSN 2073-4441) belonging to the section "Hydrogeology".

Deadline for manuscript submissions: 25 December 2026 | Viewed by 688

Editors


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Guest Editor
Water Research Institute, Universitat de Barcelona, Barcelona, Spain
Interests: hydrogeology; geophysical prospecting; water management; hydrogeophysics; managed aquifer recharge; wastewater treatment; nature-based solutions; aquifer vulnerability
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Mineralogy, Petrology and Applied Geology, Universitat de Barcelona, 08028 Barcelona, Spain
Interests: geophysical prospecting; water management; near-surface geophysics; groundwater resources; hydrogeochemistry
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Instituto de Estudios Ambientales y Recursos Naturales (iUNAT), University of Las Palmas de Gran Canaria (ULPGC), Las Palmas de Gran Canaria, Spain
Interests: groundwater resources; hydrogeochemistry and water quality; seawater intrusion; coastal aquifers; groundwater contamination; vadose zone; hydrogeology of volcanic terrains; water-rock interaction

Special Issue Information

Dear Colleagues,

Coastal aquifers are critical freshwater reserves that support ecosystems, agriculture, tourism, and urban supply. Yet, these systems face increasing pressure due to groundwater overexploitation, land‑use change, sea‑level rise, and climate‑driven alterations in recharge. These stressors intensify saltwater intrusion, threaten water quality, and compromise the long‑term sustainability of coastal groundwater bodies.

This Special Issue invites innovative research aimed at advancing the characterization of coastal aquifers, as well as understanding the processes related to freshwater–saltwater interactions. We are particularly interested in contributions that integrate field observations, laboratory analyses, numerical modeling, remote sensing, geophysical data and emerging digital technologies, fostering a more comprehensive understanding of salinization dynamics and risk mitigation.

Key topics of interest include:

  • Characterization and monitoring of coastal aquifers
  • Processes of marine intrusion, density‑driven flow, and mixing dynamics
  • Hydrochemical and isotopic tools for diagnosing salinization
  • Groundwater–surface water and groundwater–seawater interactions
  • Managed Aquifer Recharge (MAR) in coastal settings
  • Desalination, brine management, and salinity‑reduction techniques
  • Conceptual and numerical modeling of coastal aquifer systems
  • Remote sensing, sensors, Big Data, Machine Learning, and AI for monitoring and management
  • Impacts of climate change, sea‑level rise, and drought on coastal groundwater
  • Governance, regulation, and user‑community participation in coastal aquifer management
  • Nature‑based solutions and resilience strategies for coastal water security

Dr. Alex Sendros
Prof. Dr. Albert Casas Ponsati
Prof. Dr. María del Carmen Cabrera Santana
Guest Editors

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Keywords

  • hydrogeology
  • groundwater modelling
  • coastal aquifers
  • saltwater intrusion
  • hydrogeophysics
  • managed aquifer recharge
  • aquifer vulnerability
  • groundwater resources
  • hydrogeochemistry
  • groundwater quality

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Published Papers (1 paper)

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Research

20 pages, 13828 KB  
Article
Study on Seawater Intrusion in a Coastal Aquifer Under Climate Change and Sea-Level Rise
by Guangping Xu, Zhao Liu, Jiawen Wan, Hengguang Liu, Chihang Wei, Peiyuan Lin and Luwen Zhuang
Water 2026, 18(16), 1996; https://doi.org/10.3390/w18161996 - 14 Aug 2026
Viewed by 396
Abstract
Climate change and sea-level rise are expected to intensify groundwater salinization in coastal aquifers, yet their relative contributions remain insufficiently quantified. This study developed a MODFLOW–SEAWAT model to compare the combined impacts of future precipitation change and sea-level rise on groundwater salinization in [...] Read more.
Climate change and sea-level rise are expected to intensify groundwater salinization in coastal aquifers, yet their relative contributions remain insufficiently quantified. This study developed a MODFLOW–SEAWAT model to compare the combined impacts of future precipitation change and sea-level rise on groundwater salinization in a representative coastal aquifer of the Pearl River Delta (PRD), China. The groundwater-flow component was calibrated using heads from 54 observation wells (R2 = 0.878, RMSE = 0.699 m), and the initial salinity field was constructed and spatially evaluated using chloride concentrations from 142 sampling sites. Four scenarios, including baseline, sea-level rise, future precipitation (SSP5-8.5), and their combination, were simulated over 30- and 60-year periods. The scenario comparison indicates that sea-level rise alone slightly increases groundwater salinity, whereas the selected SSP5-8.5 precipitation series produces a stronger response through recharge and freshwater dilution. Under the SSP5-8.5 scenario, the combined area of high-salinity groundwater (Degrees IV and V) after 60 years decreases by approximately 50% compared with the baseline scenario. The combined scenario exhibits salinization patterns similar to those of the precipitation scenario, indicating that precipitation change has a stronger influence than sea-level rise under the selected scenario and hydrogeological conditions of the PRD. These findings suggest that targeted artificial recharge in recharge-sensitive inland transition zones could help mitigate groundwater salinization and support climate adaptation in coastal regions. Full article
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