Characterization of a coastal aquifer a case study

Abstract

The present study deals with the characterization of the coastal aquifer in the Pavanje river sub-basin through the pumping tests and the electrical resistivity tests. The electrical resistivity tests are also used to study the geology of the aquifer and possible saltwater intrusion. The transmissivity of the region varies from 50 m2/d 160 m2/d and the specific yield up to 8%. The results of the electrical resistivity tests indicate that the top surface is having a resistivity of 400 1000 ohm-m with an average thickness of 5 m and the bottom layer is having the resistivity of 80 300 ohm-m with an average depth of 20 m. Additionally, an attempt was made to model the groundwater flow in the region using FEFLOW software for the period between June, 2006 and April, 2007. The model is run for different pumping scenarios considering the probable developments in the region. Saltwater intrusion is predicted at some specific locations due to low water table condition during the summer. The water budget estimation indicates that there is significant groundwater outflow from the area during June to November. Hence, it is necessary to carry out investigations to arrest this outflow which may be utilized during the lean season. 2009 Taylor & Francis Group, LLC.