RAYHAN, GHAZA LAZARUZ (2021) IDENTIFIKASI ZONA AKUIFER AIR PAYAU MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI KECAMATAN SAMBUNGMACAN, KABUPATEN SRAGEN, JAWA TENGAH. Other thesis, Universitas Pembangunan Nasional "Veteran" Yogyakarta.
Full text not available from this repository.Abstract
INTISARI IDENTIFIKASI ZONA AKUIFER AIR PAYAU MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI KECAMATAN SAMBUNGMACAN, KABUPATEN SRAGEN, JAWA TENGAH Oleh : Ghaza Lazaruz Rayhan 115.160.036 Penggunaan air minum rumah tangga di Sragen mengalami peningkatan dari tahun ke tahun. Di Sragen, air tanah merupakan salah satu sumber air bersih yang banyak digunakan, karena mudah diperoleh dan relatif murah eksplorasi dan eksploitasinya. Sayangnya beberapa akuifer, terutama akuifer yang dalam terdapat air payau sehingga tidak layak dijadikan sebagai sumber air bersih tanpa pengolahan terlebih dahulu. Pertimbangan pemilihan lokasi penelitian adalah adanya keunikan di daerah penelitian yang jauh dari laut namun ditemukan adanya akuifer air payau. Sedangkan alasan pemilihan metode karena akuifer air payau dapat dengan mudah diidentifikasi oleh parameter geolistrik, yaitu nilai resistivitas. Perbedaan nilai resistivitas antara akuifer air payau yang lebih rendah daripada nilai resistivias batuan di sekitarnya membuat metode geolistrik cocok digunakan untuk mencari letak akuifer air payau di daerah penelitian. Penelitian bertujuan untuk mengetahui daerah-daerah yang terdapat akuifer air payau di Kecamatan Sambungmacan, Kabupaten Sragen, Jawa Tengah. Akuisisi dilakukan menggunakan metode geolistrik konfigurasi schlumberger dengan 20 titik pengukuran dengan bentangan sepanjang 600 meter. Pengolahan berupa curve matching dilakukan untuk mendapat nilai resistivitas yang sesungguhnya pada tiap lapisannya. Curve matching dilakukan menggunakan software IP2WIN kemudian dilakukan korelasi antar titiknya menggunakan software Strater. Selain itu juga dilakukan pengolahan 3D menggunakan software Rockworks. Hasil pengolahan data menunjukkan bahwa persebaran air payau di daerah penelitian berada di bagian timur lokasi penelitian (titik 18, 10, 8, 12, 13, 14, dan 19) dan di bagian tengah lokasi penelitian (titik 11, 1, 3, 2, dan 4). Akuifer air payau ini terdapat di lapisan batupasir. Rentang nilai resistivitas air payau daerah penelitian adalah sebesar 2,91 – 4,64 Ωm. Akuifer air payau di daerah penelitian berada di kedalaman sekitar 53 – 66 meter di bawah permukaan tanah dan ketebalan sekitar 9 – 14 meter. Keberadaan air payau ini diduga berasal dari air masa lampau (connate water). Daerah penelitian pada masa lampau berupa lautan yang kemudian mengalami pengangkatan. Dasar air laut yang tidak rata (ada tinggian dan rendahan) menyebabkan air laut terjebak dan terakumulasi di daerah rendahan. Hal ini yang membentuk spot-spot akuifer air payau pada daerah penelitian Kata Kunci : Air payau, Geolistrik, Schlumberger, Sambungmacan ABSTRACT IDENTIFICATION OF BRACKISH WATER AQUIFER ZONE USING GEOELECTRICAL METHOD, CONFIGURATION OF SCHLUMBERGER AT SAMBUNGMACAN DISTRICT OF SRAGEN, CENTRAL JAVA By : Ghaza Lazaruz Rayhan 115.160.036 The use of household drinking water in Sragen has increased from year to year. In Sragen, groundwater is one of the most widely used sources of clean water, because it is easy to obtain and relatively cheap to explore and exploit. Unfortunately, some aquifers, especially aquifers that contain brackish water, are not suitable as a source of clean water without prior treatment. The consideration in selecting the research location is the uniqueness of the research area which is far from the sea but brackish aquifers are found. Meanwhile, the reason for choosing the method is because the brackish water aquifer can be easily identified by the geoelectric parameter, namely the resistivity value. The difference in the resistivity value between the brackish water aquifer which is lower than the resistivity value of the surrounding rocks makes the geoelectric method suitable to be used to locate brackish water aquifers in the study area. This study aims to determine the areas where brackish water aquifers are located in Sambungmacan District, Sragen Regency, Central Java. The acquisition was carried out using the Schlumberger configuration geoelectric method with 20 measuring points with a stretch of 600 meters. Processing in the form of curve matching is done to get the real resistivity value for each layer. Curve matching was performed using IP2WIN software and then correlated between points using Strater software. In addition, 3D processing is also carried out using Rockworks software. The results of data processing show that the distribution of brackish water in the study area is in the eastern part of the research location (points 18, 10, 8, 12, 13, 14, and 19) and in the middle of the research location (points 11, 1, 3, 2, and 4). This brackish water aquifer is found in sandstone layers. The range of resistivity values for brackish water in the study area is 2.91 - 4.64 Ωm. The brackish water aquifer in the study area is at a depth of about 53 - 66 meters below ground level and a thickness of about 9 - 14 meters. The presence of brackish water is thought to have originated from connate water. The research area in the past was in the form of an ocean which then underwent a lift. Uneven seabed (there are high and low) causes sea water to be trapped and accumulate in low-lying areas. This is what forms brackish water aquifer spots in the study area. Keywords: Brackish Water, Geoelectric Method, Schlumberger, Sambungmacan
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | Q Science > Q Science (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment |
| Depositing User: | Muji Isambina |
| Date Deposited: | 08 Feb 2021 02:52 |
| Last Modified: | 08 Feb 2021 02:52 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/24568 |
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