PENDUGAAN INTRUSI AIR LAUT DALAM PERSIAPAN PENGEBORAN SUMUR DALAM DENGAN METODE GEOLISTRIK 2D KONFIGURASI WENNER DI DESA KETING KECAMATAN JOMBANG KABUPATEN JEMBER

Abstract

If exploitation of ground water is not managed and controlled effectively, it will cause a decline in groundwater levels. The Reduction of soil water content in the layer of the aquifer can cause sea water intrusion into aquifer. Sea water intrusion is influx of sea water to aquifer. Based on the results of observation, the societies of Keting village mostly need groundwater through shallow wells that have a small discharge. Therefore, the Department of Energy and Mineral Resources of Jember conducted a survey to undertake deep wells drilling in the Keting village to supply clean and sufficient water for the societies. However, based on hydrogeological maps of geology directorate environmental governance published in 1981, the Keting village is located quite close to the area affected by sea water intrusion. The purpose of this study is to investigate and interpretate subsurface conditions related to structural dynamics estimation of sea water intrusion at the point of deep wells drilling in the Keting village. The method used is a method of geophysical resistivity with Wenner configuration. Tracks on research along 750 meters with 25 meters spacing. Research results is obtained in the drilling area has a value of resistivity in the range of 5.75 Ωm - 249 Ωm. In the range of 5.75 Ωm - 16.9 Ωm is ground water, in the range of 28.9 Ωm - 49.5 Ωm is very wet clay layer or contains a lot of groundwater, at 84.8 Ωm resistivity value is clay layers were quite dry, while in the range of 145 Ωm - 249 Ωm is gravel and sand.