Nurfitriana, Isnaeni (2018) Identifikasi sungai Bawah Permukaan Dengan Metode Resistivitas 2D Konfigurasi Wenner-Schlumberger Kawasan Karst Desa Dersono, Pacitan. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Potensi sumberdaya air pada kawasan karst sangat melimpah, akan tetapi sangat sulit diketahui keberadaanya. Perilaku air di kawasan karst membentuk sistem hidrologi yang khas dan rumit karena berkembang melalui sistem rekahan dan saluran bawah permukaan yang sulit untuk diketahui posisi serta potensinya. Kawasan Karst Desa Dersono merupakan daerah dengan tingkat kekeringan terparah di Kabupaten Pacitan. Penelitian ini bertujuan untuk mengidentifikasi keberadaan sungai bawah permukaan kawasan karst Desa Dersono, Pacitan dengan menggunakan metode Resistivitas 2D. Titik pengukuran dibuat berdasarkan survei pendahuluan dan informasi manifestasi luweng yang ada pada lokasi penelitian. Akuisisi data dengan menggunakan konfigurasi Wenner-Schlumberger sebanyak enam lintasan dengan panjang bentangan maksimal 120 meter. Hasil pengolahan data dan interpretasi menunjukkan pada lintasan 1, 2 dan 4 diindikasi adanya batuan karbonat masif dengan nilai resistivitas 266-1000 Ohmmeter. Penampang resistivitas lintasan 3 menunjukkan anomali nilai resistivitas tinggi yang diinterpretasi sebagai gua kosong dengan nilai resistivitas antara 1973-3000 Ohmmeter. Penampang 2D lintasan 5 dan 6 menunjukkan anomali dengan rentang nilai resistivitas kecil antara 13,6-20 Ohmmeter yang diinterpretasi sebagai sungai bawah permukaan dengan kedalaman 8-16 meter. Hasil pemodelan menunjukkan arah aliran sungai bawah permukaan yang diperkirakan berarah Timur Laut-Barat Daya dan diduga masih dikontrol oleh sesar Barong dengan arah yang sama yaitu Timur Laut-Barat Daya yang terdapat pada wilayah timur lokasi penelitian
Kata Kunci : Resistivitas 2D, Sungai Bawah Permukaan, Wenner-Schlumberger
============================================================ Potential water resources in the karst area is abundant, but very difficult to know the position. Water behavior in the karst area forms a unique and complicated hydrological system because develops through a system of fractures and subsurface channels that are difficult to know the position and its potential. . Karst Area Dersono Village Pacitan regency is the region with the worst dryness. This research aims to identify underground river karst area of Dersono Village, Pacitan by using 2D Resistivity method. The measurement point is based on preliminary survey and information manifestation of luweng present at the research location. Acquisition is done by using the Wenner-Schlumberger array, which consists of six line with a maximum line length of 120 meters. The result of data processing on line 1, 2 and 4 shows indication of massive carbonate rock with resistivity value 266-1000 Ohmmeter. Line 3 shows a high resistivity anomaly that is interpreted as an empty cave with resistivity values between 1973-3000 Ohmmeter. Line 5 and 6 show anomalies with a range of resistivity values between 13.6-20 Ohmmeter interpreted as subsurface streams. The result of modeling shows the direction of underground river flow which is estimated to be Northeast-Southwest which is presumably still controlled by Barong fault located on the east of the research location.
Keyword : 2D Resistivity, Undergroun River, Wenner-Schlumberger
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | 2D Resistivity, Undergroun River, Wenner-Schlumberger |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Nurfitiana Isnaeni |
| Date Deposited: | 01 Jul 2021 07:41 |
| Last Modified: | 01 Jul 2021 07:41 |
| URI: | http://repository.its.ac.id/id/eprint/56751 |
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