Identifikasi Intrusi Air Laut Pada Air Tanah Menggunakan Metode Induced Polarization: Studi Kasus Daerah Surabaya Timur

Sebagian besar air tanah di wilayah kota Surabaya sudah mengalami intrusi air laut dan memiliki kadar garam yang tidak sesuai standar air minum. Permasalahan akifer air tanah yang sudah terintrusi air laut diidentifikasi menggunakan metode Induced Polarization dilengkapi dengan data sumur dan data resistivity sebagai data pelengkap. Pengukuran data sumur dilakukan dibeberapa lima belas titik di Surabaya timur yang hasilnya menunjukkan parameter-parameter air seperti salinitas, TDS, konduktivitas, dan pH. Pengukuran Induced Polarization dan Resistivity metode Wener-Schlumberger dilakukan di tiga lintasan di Surabaya timur yang tersebar di daerah air asin, air payau rendah, dan air tawar. Penampang Chargeability dan Resistivity memiliki penetrasi kedalaman 9 m menunjukkan hasil yang cukup baik dalam mengidentifikasi akifer air tanah. Akifer dengan nilai resistivitas rendah (6.81 ohm.m) dan chargeabilitas rendah (<0.302 msec) besar kemungkinan merupakan air asin. ================================================================================================================== Most of the groundwater in city of Surabaya has undergone sea water intrusion and its salinity are not suitable for drinking water standards. Groundwater aquifer problem that has been intruded seawater identified using the IP method with wells data and data resistivity as correlation data. Measurement of wells data is carried out in fifteen points in east Surabaya that the results indicate the water parameters such as salinity, TDS, conductivity, and pH. Measurement of Induced Polarization and Resistivity with Wenner-Schlumberger methods conducted at three lines in east Surabaya, spread across saltwater, fresh to brackish water, and fresh water. Cross section of chargeability and resistivity has a penetration depth of 9 m showed good results in identifying the groundwater aquifer. Aquifer with low resistivity values (6.81 ohm.m) and low chargeability values (