Irsyad, Ahmad Wafi (2020) Identifikasi Sungai Bawah Permukaan Dengan Metode Resistivitas 2D Konfigurasi Wenner-Schlumberger Kawasan Karst Desa Sekar, Pacitan. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perilaku air di kawasan karst Pacitan membentuk sistem hidrogeologi pada sub-sistem Donorejo-Pringkukuku berkembang melalui sistem rekahan dan saluran bawah permukaan yang dikendalikan oleh sesar. Metode resistivitas 2D digunakan untuk mengidentifikasi sungai bawah permukaan dan arah alirannya berdasarkan distribusi nilai resistivitas pada kawasan karst Desa Sekar Dusun Ngrijang, Kecamatan Donorejo Kabupaten Pacitan. Digunakan konfigurasi Wenner-Schlumberger dikarenakan memiliki kemampuan pemetaan secara lateral dan vertikal yang baik. Metode inversi smoothness-constrain least square digunakan sehingga menghasilkan penampang 2D variasi resistivitas dari suatu lapisan tanah yang berasosiasi dengan struktur geologi di bawah permukaan. Akuisisi data dilakukan sebanyak enam lintasan dengan panjang tiap lintasan 185m, 185m, 145m, 130m, 145m, dan 130m. Dugaan sungai bawah permukaan di daerah penelitian diidentifikasi dengan nilai resistivitas antara 2.6-20 Ohm. Dengan indikasi hubungan sungai bawah permukaan dari Sumber Koboran menuju Sumber 1 dan Sumber Kali Cilik menuju Sumber Koboran berarah Timur Laut-Barat Daya yang diduga terkontrol oleh perbedaan elevasi dan Sesar Buyutan yang merupakan sesar terdekat yang terdapat pada wilayah timur lokasi penelitian.
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Water behavior in the Pacitan karst region forms the hydrogeological system in the Donorejo-Pringkukuku sub-system, which develops through fracture systems and subsurface channels that are controlled by faults. Resistivity 2D method is used to identify subsurface rivers and it’s direction based on the distribution of resistivity in the karst area of Ngrijang Sekar Village, Donorejo District, Pacitan Regency. Wenner-Schlumberger configuration is used because it has fine lateral and vertical mapping capabilities. The least square smoothness-constrain inversion method is used so as to produce a 2D cross section of the resistivity variation of a soil layer associated with subsurface geological structures. Data acquisition was carried out in six lanes with lengths of each of 185m, 185m, 145m, 130m, 145m and 130m. Alleged subsurface rivers in the study area were identified with resistivity values between 2.6-20 Ohm.m. With an indication of the relationship between subsurface rivers from Koboran water source to 1 water source and Kali Cilik water source to the Koboran water source with orientation Northeast-Southwest which is allegedly controlled by differences in elevation and Buyutan Fault which is the closest fault found in the eastern area of the study site.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Resistivity 2D, Underground River, Wenner-Schlumberger, Sungai Bawah Permukaan, Karst, Resistivitas 2D |
| Subjects: | G Geography. Anthropology. Recreation > GB Physical geography > GB600 Karst conservation. |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Ahmad Wafi Irsyad |
| Date Deposited: | 25 Aug 2020 06:55 |
| Last Modified: | 29 May 2023 14:46 |
| URI: | http://repository.its.ac.id/id/eprint/80950 |
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