alexa Abstract | Groundwater Flow Modeling in Coastal Aquifers: The Influence of Submarine Groundwater Discharge on the Position of the Saltwater-Freshwater Interface
ISSN: 2473-3350

Journal of Coastal Zone Management
Open Access

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Research Article Open Access

Abstract

An investigation of the impact of submarine groundwater discharge on the position of saltwater-freshwater interface is presented in this manuscript. Two conceptualizations were considered and analyzed using both analytic and numerical techniques, for comparison purposes. The first conceptualization assumes that the tip of the saltwaterfreshwater interface occurs at the shoreline, and the second conceptualization allows for the tip to extend off-shore. Analytic solutions exist for both conceptualizations. Results from both analytic and numeric analysis for the two conceptualizations are presented. Results from the first conceptualization were found to overestimate the inland distance to the interface toe, compared to the second conceptualization, for it ignores the influence of submarine groundwater discharge on the interface location. Moreover, results from the analytic solutions as a whole were found to overestimate the interface location compared to the numerical modeling results, for analytic solutions are based on the sharp interface approximations. Therefore, an empirically derived dispersion factor should be used to correct the analytic solution results so as to compare them with the numerically simulated values. Furthermore, offshore model extents should be incorporated when modeling coastal aquifer systems to include the influence of submarine groundwater discharge on the saltwater-freshwater interface position.

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Author(s): Haile Arefayne Shishaye*

Keywords

Groundwater flow modelling, Seawater intrusion, Submarine groundwater discharge, Seawat, Analytic solution, Numerical modelling, Coastal Aquifer, Coastal Bar/ Coastal Spit, Coastal Development

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