Identifikasi Perkembangan Sistem Sungai Bawah Permukaan Kawasan Karst Dersono Pacitan Menggunakan Metode VES (Vertical Electrical Sounding)

Hardyani, Putry Vibry (2018) Identifikasi Perkembangan Sistem Sungai Bawah Permukaan Kawasan Karst Dersono Pacitan Menggunakan Metode VES (Vertical Electrical Sounding). Undergraduate thesis, Institut Teknlogi Sepuluh Nopember.

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Abstract

Pegununungan Sewu merupakan salah satu kawasan karst yang menarik karena keberadaan sistem sungai bawah permukaan yang berkembang di bawahnya. Salah satu yang terkenal yaitu sistem sungai bawah permukaan Bribin di Kabupaten Gunung Kidul. Kawasan karst Dersono, Pacitan merupakan bagian timur dari sistem Pegunungan Sewu. Kawasan karst Dersono Pacitan sama halnya dengan kawasan karst Gunung Kidul, diduga juga mempunyai sistem sungai bawah permukaan yang khas namun belum diketahui bagaimana perkembangan sistem sungai bawah permukaan tersebut. Penelitian ini bertujuan untuk mengidentifikasi perkembangan sistem sungai bawah permukaan kawasan karst Dersono, Pacitan berdasarkan anomali nilai resistivitas hasil penelitian geolistrik menggunakan metode VES (Vertical Electrical Sounding). Pengambilan data resistivitas dilakukan sebanyak 14 titik VES yang tersebar di dua lokasi berbeda dengan variasi jarak antar titik-titik VES sebesar 5 s.d 15 meter. Konfigurasi yang digunakan yaitu konfigurasi Schlumberger dengan panjang bentangan 200 dan 260 meter. Hasil penelitian menunjukkan terdapat anomali nilai resistivitas rendah ke tinggi yakni sekitar 5782,4 Ohm.m dan 3239,8 Ohm.m dan diidentifikasi sebagai rongga-rongga atau gua kosong sebanyak dua tingkat yang berada di kedalaman 15-25 meter dan 35-40 meter. Rongga-rongga atau gua kosong tersebut diduga berkembang karena proses pelarutan batuan yang terjadi pada zona vadose atau di atas muka air tanah. Kata Kunci : Gua, Karst, Sistem Sungai Bawah Permukaan, VES (Vertical Electrical Sounding)=================================================================Pegunungan Sewu are one of the most attractive karst areas due to the presence of underground river systems that develop beneath them. One of the well-known is the Bribin underground river system in Gunung Kidul Regency. Dersono karst area, Pacitan is the eastern part of the Pegunungan Sewu system. The Dersono Pacitan karst area is similar to the Gunung Kidul karst area, allegedly also has a distinctive subsurface river system but it is not yet known how the development of the underground river system. This study aims to identify the development of underground river systems in the Dersono, Pacitan area based on the anomaly of resistivity values from geoelectric research using the VES (Vertical Electrical Sounding) method. Resistivity data retrieval was done as many as 14 VES points spread over two different locations with variation of distance between VES points by 5 s.d 15 meter. The configuration used is the Schlumberger configuration with a length of 200 and 260 meters. The results showed that there were low to high resistivity value anomalies of around 5782.4 Ohm.m and 3239.8 Ohm.m and identified as empty cavities or caves as much as two levels which were at a depth of 15-25 meters and 35-40 meters . The cavities or empty caves are suspected to develop due to the process of dissolution of rocks that occur in the vadose zone or above the groundwater level. Keywords : Cave, Karst, Surface River System Surface, VES (Vertical Electrical Sounding)

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Gua, Karst, Sistem Sungai Bawah Permukaan, VES (Vertical Electrical Sounding)
Subjects: Q Science > QE Geology
Divisions: Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses
Depositing User: Hardyani Putry Vibry
Date Deposited: 06 Jul 2021 10:16
Last Modified: 06 Jul 2021 10:16
URI: https://repository.its.ac.id/id/eprint/56704

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