Integrated analysis of the coastal aquifer system of Thorikos Valley, Attica, Greece

Summary An integrated study is presented with the combination of a series of hydrogeological and geophysical investigations that took place in the coastal aquifer system of Thorikos valley (Attica Region, Greece). Both studies prove that seawater intrusion is an ongoing hydrologic process that takes place within both aquifer layers of the investigated area. The extent of the seawater intrusion front is limited within the coastal zone, while the piezometric conditions suggest that this is a passive type of intrusion. A FEM map of the subtraction of conductivities for two effective depths (HCP mode) shows great similarity with the distribution of chloride ions in the alluvial aquifer.