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Identifikasi Zona Rentan Payau Menggunakan Metode Geolistrik Di Pantai Ngetun sebagai Langkah Awal Pengembangan Wilayah Muhammad Faizal Zakaria; Dya Nida A’yunin
Integrated Lab Journal Vol. 7 No. 2 (2019): Integrated Lab Journal
Publisher : UIN Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/ilj.2019.%x

Abstract

Pantai Ngetun merupakan salah satu pantai dengan pemandangan yang luar biasa di daerah Gunungkidul. Pantai ini masih sepi karena akses yang cukup jauh dan kurang memadai. Salah satu masalah yang muncul pada pantai ini adalah ketersediaan air bersih. Air yang ada dipinggir pantai memiliki sifat payau Karena bercampur dengan air laut (intrusi air laut). Penelitian ini bertujuan mengetahui persebaran zona intrusi air laut Pantai Ngetun. Penelitian dilakukan dengan melakukan survei Geofisika yaitu metode Geolistrik konfigurasi dipol-dipol sebanyak 9 lintasan. Hasil yang didapatkan berupa variasi nilai resistivitas bawah permukaan. Interpretasi dari hasil geolistrik adalah lapisan Pasir pantai Basah dengan nilai resistivitas 1.06 - 6.61 Ωm, lapisan Pasir Pantai Kering dengan nilai resistivitas 16.5 - 41.2 Ωm, lapisan kapur atau gamping dengan nilai resistivitas 103 – 643 Ωm. Intrusi air laut diduga masuk ke dalam daratan sejauh 70 m dari garis pantai dengan kedalaman 10 m sampa 25m. Intrusi air laut ini tidak mempengaruhi air tanah yang berada lebih jauh dari 70 m dari garis pantai.
ERT geoelectric application to determine the leakage direction of Embung Batur Agung, Karangwetan, Karangmojo District, Gunungkidul Regency, Indonesia Muhammad Faizal Zakaria; Sari Bahagiarti Kusumayudha; Hanafiah Hamid
International Journal of Advances in Applied Sciences Vol 12, No 2: June 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v12.i2.pp93-102

Abstract

Embung Batur Agung is a source of irrigation for residents around Embung. Depreciation of water in the reservoir occurs due to leakage from the geomembrane layer of the Embung Batur Agung. This study aims to determine the direction of leakage from the reservoir so that appropriate treatment can be carried out. This research was done using hydrogeological analysis and electrical resistivity tomography (ERT) geoelectrical measurements. ERT Geoelectrical measurement uses a dipole-dipole configuration with a spacing of 5 m and 10 m and a line length of 100 m. There are 2 lines in the southwest and southeast of the reservoir. The results of geohydrology analysis, it was found that the aquifer system around the reservoir included in the Gunungsewu aquifer system, and the dynamics of surface groundwater are controlled by faults and fractures. The results of the ERT geoelectrical measurement, there is a low anomaly which can indicate a reservoir leak at 50-60 m on line 1 which is in the southwest of the reservoir. This low anomaly has a vertical pattern as well as there is a fracture which is the cause of the reservoir leak. These low anomaly values range from 4-30 Ωm which can be interpreted as the presence of water that has conductive properties. The results of this study are expected to be used by the local government to handle the leakage of the reservoir.