Potential of mixed hydraulic barriers to remediate seawater intrusion

The Science of the Total Environment
Pia EbelingMarc Walther

Abstract

Remediation measures are crucial to prevent or reverse seawater intrusion deteriorating coastal fresh groundwater resources. The mixed hydraulic barrier approach, as a combination of positive and negative hydraulic barriers, holds promising advantages especially for arid areas because extracted water provides a resource for injection after treatment. However, transient remediation mechanisms and impact of parameters are still unsatisfyingly understood. Therefore, the feasibility and optimal management of mixed hydraulic barriers as well as a comparison to single positive and negative barriers are explored with a synthetic 2D variable-density model of an already salinated, unconfined coastal aquifer using SEAWAT and FloPy. The hydraulic conductivity, porosity, injection and extraction rate, barrier locations, injection salt concentration, and reduction of pumping stress are varied jointly to determine the parameters' impact and interdependencies. The hydraulic conductivity controls the overall remediation potential as a hydrogeological component. Reduced inland abstractions of supply wells and the injection rates of the positive barrier show the largest remediation effects. However, locating the positive barrier within the salt ...Continue Reading

Citations

Jan 29, 2021·The Science of the Total Environment·Bo ZhangMarc Walther
Jan 12, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Amir Mohaghegh MotlaghHumayra Saba
Apr 1, 2021·Environmental Science and Pollution Research International·Ezzeddine Laabidi, Rachida Bouhlila
Dec 2, 2021·The Science of the Total Environment·Fernando Sola, Angela Vallejos

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