Well Location Influence on Seawater Intrusion in Coastal Aquifers

Coastal aquifers serve as an important freshwater resource for millions, but the increased extraction of groundwater has increased risk of seawater intrusion (SWI). By understanding the influence of well pumping on SWI, we can better identify vulnerable aquifers and suggest water management policies to prevent contamination. Using 2-D numerical models of groundwater flow and salt transport, we assess the extent of SWI in a variety of aquifer characteristics and pumping schemes. Findings suggest variations in the location and pumping rate between multiple wells in topography-limited coastal aquifers (i.e. aquifers in which the hydraulic heads are limited by topography rather than recharge) can influence the extent of SWI. This study identifies numerical model characteristics that should be carefully considered for optimal pumping schemes and gives insights into coastal water resource vulnerability.