How does saltwater enter coastal aquifers?
In coastal aquifers, fresh groundwater flows seaward and keeps denser saltwater deeper and toward the coast.
Formation process and geographic mechanism
Heavy pumping lowers freshwater head, weakens the seaward gradient and allows saltwater to move inland. Deep coastal wells may draw the salty interface upward in a cone. Drought reduces recharge, while sea-level rise and canals can increase risk. Flushing salted pores is slow, so impacts may persist for years.
Spatial outcomes, measurement and management
Monitoring wells track conductivity, chloride and water level. Responses include reducing or relocating pumping, spreading wells, managed recharge and coordinated surface-water use. Intrusion does not advance as a straight coastal line; geology controls pathways. Treatment alone does not stop movement within the aquifer.
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