Abstract
Bungaya Kangin Village, Bebandem District, Karangasem Regency, Bali Province consists of paddy fields and settlements, required therefore a water source / aquifer that can meet all these needs. One of the Geophysical Methods that can identify the aquifer is the Geoelectric Method. Geoelectric method used in this research is Resistivity Method. Data acquisition using Vertical Electrical Sounding (VES) and Electrical Resistivity Tomography (ERT) Methods. VES method is a method of measurement to determine the variation of resistivity vertically at one point. Electrical Resistivity Tomography (ERT) method is a method of measuring resistivity on soil surface / rock by using many electrode (51 electrode), to obtain sub-surface resistivity variation lateraly and verticaly, to obtain sub-surface image. The equipment used for geoelectric measurements is Resistivity Meter of Naniura NRD 300 Hf which has been equipped with a switchbox to adjust the displacement of 51 electrodes. Based on the resistivity modeling results, the aquifers in the study area were found in rough sandstones with resistivity values : (49 - 100) Ohm.m.
Highlights
Kebutuhan air di daerah Bebandem cukup tinggi yang digunakan untuk keperluan sehari-hari serta untuk mengairi lahan persawahan
Bali Province consists of paddy fields and settlements
Geoelectric method used in this research is
Summary
Potensi air tanah yang terdapat di daerah Bebandem, Karangasem tergantung dari: imbuhan air tanah alamiah, kondisi hidrogeologi dan karakteristik hidraulik akuifer. Jumlah imbuhan air tanah tahunan merupakan hasil perkalian dari curah hujan rata-rata tahunan dengan koefisien imbuhan (Encona Eng. Inc et., al, 1988). Kondisi hidrogeologi adalah lapisan pengandung air (akuifer). Terdapat beberapa macam akuifer yaitu : akuifer terkekang, akuifer semi terkekang dan akuifer bebas. Karakteristik hidraulik yang dimaksud adalah transmisivitas, kelulusan hidraulik dan koefisien kandungan atau simpanan pada akuifer terkekang atau lepasan jenis (specific yield) pada akuifer bebas. Akuifer memiliki kontras resistivitas terhadap tanah / batuan lainnya yang terdapat di daerah penelitian, seperti breksi, lava dan tufa. Kontras resistivitas akuifer dapat diketahui dengan menggunakan Metode Geolistrik Resistivitas. Metode Geolistrik telah terbukti berhasil dalam kegiatan penelitian dangkal, seperti pendugaan air tanah dan pencairan mineral logam (Reynolds, 1998)
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