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• W3120807657 endingPage "125964" @default.
• W3120807657 startingPage "125964" @default.
• W3120807657 abstract "• Air barrier is capable of repelling intruded seawater in coastal unconfined aquifers. • The potency of air barrier in unconfined aquifers is inferior to the confined ones. • The ability of air barrier in confined aquifers can be achieved in unconfined ones. Subsurface fluids injection is a viable alternative for controlling seawater intrusion in coastal regions, and freshwater is usually served for valid fluids to generate pressure ridge towards the ocean. But other fluids injection, such as compressed air, which presents clean and readily available, is a more attractive solution for repulsing the intruded seawater where freshwater is insufficient. In this study, the performance of compressed air injection (i.e., air barriers) for mitigating seawater intrusion in a coastal unconfined aquifer was quantificationally assessed using a coupled water-air two-phase flow and saltwater transport model. As compressed air is introduced into the aquifer at the toe of saltwater wedge, the seaward hydraulic gradient adjacent to the coast is produced driven by the generated airflow, thereby causing salt-freshwater interface to retreat to the ocean. The magnitude of air injection rate, related to the operational cost of air barriers, does not increases significantly given the progressively decreasing change rate. Compared to the workability of air barriers in the confined aquifer under similar conditions, the reduction in intruded seawater at 365.0 d in the unconfined aquifer reaches only about 0.45 times that in the confined aquifer, which indicates the significance of the boundary condition of aquifer top. The sensitivity analysis of the overlying unsaturated zone reveals that with its permeability decreasing or its thickness increasing, the performance of air barriers is enhanced owing to the blocking effect of the overlying layer on the escape of generated airflow and tends progressively to be stable. Particularly, the efficacy of air barriers in the confined aquifer, including the reduction in intruded seawater and the air injection rate, also can be achieved in an unconfined aquifer with an overlaying sufficient-semipermeable layer." @default.
• W3120807657 created "2021-01-18" @default.
• W3120807657 creator A5014390459 @default.
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• W3120807657 date "2021-04-01" @default.
• W3120807657 modified "2023-10-17" @default.
• W3120807657 title "Numerical assessment of compressed air injection for mitigating seawater intrusion in a coastal unconfined aquifer" @default.
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• W3120807657 doi "https://doi.org/10.1016/j.jhydrol.2021.125964" @default.
• W3120807657 hasPublicationYear "2021" @default.
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