Estimation of Aquifer Parameters from Vertical Electrical Sounding Measurements South Gaza Strip, Palestine

Abstract

In this study quantitative interpretation of some 14 Vertical Electrical Sounding (VES) points using the Schlumberger array and data from 10 boreholes were applied to study the aquifer geoelectrical/hydrogeological parameters in the southern governorates of Gaza Strip. The quantitative interpretation of (VES) results analyzed in order to find empirical relations between different aquifer parameters. The results represent the predicted hydraulic conductivity (K), transmissivity (Tr), TDS, earth resistivity, water resistivity, porosity and Dar-Zarrouk parameters (Longitudinal conductance and Transverse resistance). The results show the earth resistivity is strongly affected by the chemistry and salinity of the groundwater. The relation between longitudinal resistivity (ρL) and groundwater salinity (TDS) was achieved for groundwater aquifer. The geoelectric (Dar-Zarrouk) parameters determined and interpreted by using the integration of the results, which indicates that longitudinal conductance has a high values at the western part of the study area represents an increase in groundwater movement horizontally, that is a strong evidence of seawater intrusion. Porosity was estimated to be in the range of 38–52% with an average value of 46%. Transmissivity values for the study area were calculated. This result helps to delineate the contact between the saline and fresh groundwater aquifer in the study area.