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Saltwater intrusion management using the swi2 model: application in the coastal aquifer of Hersonissos, Crete, Greece

Pappa, Athina, Dokou Zoi, Karatzas Giorgos

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Summary

This work assesses the effectiveness of different methods of saltwater intrusion management in a coastal aquifer. The study area is Hersonissos, near Heraklion, Crete, Greece, where saltwater intrusion is a significant threat for the sustainability of the local groundwater resources. The saltwater intrusion phenomenon was simulated using the MODFLOW program coupled with the SWI2 package, to calculate the hydraulic heads in the area and to estimate the position of the seawater intrusion front. Various saltwater intrusion management methods were examined such as the artificial recharge of the aquifer with reclaimed wastewater, the optimization of the pumping rates of the supply wells and the extraction of saltwater at locations where the problem is more acute, indicated by the thickness of the intrusion zone. The above management options are evaluated individually and in combination, to assess their relative and joint effect in managing the saltwater intrusion problem in the area.

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