COASTAL HIDROGEOLOGY: COMPARATIVE ISSUES IN AREA OF RECENT QUATERNARY SEDIMENT HOLOCENE – PARANÁ COAST

Abstract

The coastal hydrogeology has characteristics quite peculiars, both in quantitative and qualitative point of view. This study, we present the comparative results between two studies in two areas of the coastline of Paraná. One area is located in Valadares Island and the other in an area located in Pontal do Sul.  The results show that even being in the same geological feature and close, approximately 17 km, the hydrogeological results show considerable variations. The Valadares Island, the effect of the tidal in the groundwater level influences the quality of water and the underground flux which not observed in Pontal do Sul. The hydraulic conductivity variation is of the order of 10² cm/s. The electric conductivity in Pontal do Sul is considerably lower than Valadares Island, indicating an unconfined aquifer of continental origin and without influence of tidal. The recharge in both areas are mainly related to rainfall but, the discharge in Valadares Island is related to the wells that serve the population in the form of supply while in Pontal do Sul the discharge is strongly skewed toward  to Perêque river and its mangrove area in a very narrow range, near the beach, to the sea.