Case study: Estimating the occurrence of sea water intrusion using geoelectrical method in Pangandaran district

Abstract

Abstract Research to find out intrusion in Pangandaran is very interesting, because this area is close to coastal objects that has been expanding and leading tourist attraction in West Java, Indonesia. This intrusion information is useful to determine aquifer locations which indicate below that the location is saturated water. If this aquifer locations are detected in large areas and wide volume, then this location will have potential liquefaction during a big earthquake. This research could be used as the first step before the next research to measure and calculate on either location by detail grid and radius with these 2 lines, so it is gotten direct and large distribution of sea-water intrusion. The purpose of this study is to identify the subsurface structures to get an overview of sea-water intrusion. The method used is geoelectrical based on the electrical resistance value of the rock type. The results of the measurement of 2 lines and data processing showed that the line in Pesona Park Pangandaran and the line in SMPN 1 Soccer Field Pangandaran showed the presence of sea-water intrusion that very salty with a resistance value of 0.5-2.0 ohm-meter, at a depth of 19-20 meters.