Identifikai Kontrol Struktur Geologi Terhadap Pola Aliran Sungai Bawah Permukaan di Kawasan Karst Pringkuku, Pacitan

Aliyan, Silmi Afina (2018) Identifikai Kontrol Struktur Geologi Terhadap Pola Aliran Sungai Bawah Permukaan di Kawasan Karst Pringkuku, Pacitan. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pringkuku dan sekitarnya merupakan kawasan karst dengan krisis kekeringan terparah di Kabupaten Pacitan. Keberadaan sumber air pada karst di daerah Pacitan banyak terdapat di sungai bawah permukaan, terbentuk karena proses korosi dan erosi pada gua selama ribuan tahun. Lapisan litologi dan struktur tektonik seperti patahan, lipatan dan kekar, sering dikaitkan dengan pengembangan sistem karst. Penelitian bermaksud untuk menganalisis hubungan antara kontrol patahan yang berkembang dengan sungai bawah permukaan di kawasan karst Pringkuku. Data struktur geologi didapatkan dari hasil pemetaan geologi kemudian didukung oleh analisis kelurusan punggungan dan lembahan dari citra DEM. Hasil rekonstruksi sistem rekahan dan analisis kelurusan menunjukkan terdapat tiga sesar yang membentuk daerah penelitian, yaitu sesar oblik sinistral Klanden, sesar geser dekstral Ngadirejan dan sesar geser sinistral Barong. Hasil interpretasi data VLF dan resistivitas 2D menunjukkan terdapat pola aliran dengan arah barat laut-tenggara dan timur laut-barat daya di bagian barat daerah penelitian. Hasil analisa struktur geologi, interpretasi bawah permukaan dan keterdapatan sebaran luweng di daerah penelitian menunjukkan bahwa sesar-sesar berarah barat laut-tenggara dan timur laut-barat daya masih mengontrol sistem pola aliran sungai bawah permukaan di bagian barat daerah penelitian. ======================================================================================================== Pringkuku is a karst area with the worst drought crisis in Pacitan. The existence of water sources in the Pacitan karst area there is in the underground river, that formed due to corrosion and erosion of caves for thousands of years. Lithology layers and tectonic structures such as fault, folds and joints are often associated with karst system development. This research is aim to analyze whether a there relationship between faults control that develops with underground rivers in Pringkuku karst area. Geological structural data obtained from geological mapping and then supported by ridge and valley lineament analysis of DEM image. Subsurface data analysis is obtained from VLF and resistivity 2D data processing. The result of fracture system reconstruction and lineament analysis shows there three faults forming the study area, that are Klanden oblique fault, Ngadirejan right slip fault and Barong left slip fault. The results of VLF and resistivity 2D data interpretation show that there are northwest-southeast and northeast-southwest flow pattern in the west of the study area. The results of the geological structure analysis, subsurface interpretation and the presence of vertical cave distribution in the study area indicate that trending faults northwest-southeast and northeast-southwest still control the underground river flow system in the west of the study area. Keywords: karst, fault, flow pattern, underground river, VLF resistivity 2D, Pringkuku, Pacitan.

Item Type: Thesis (Masters)
Additional Information: RTG 551.353 Ali i-1 3100018078060
Uncontrolled Keywords: karst, sesar, pola aliran, sungai bawah permukaan, VLF, resistivitas 2D, Pringkuku, Pacitan, karst, fault, flow pattern, underground river, VLF resistivity 2D
Subjects: Q Science > QE Geology > QE601 Geology, Structural
T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport
Divisions: Faculty of Civil, Environmental, and Geo Engineering > Geomatics Engineering > 29101-(S2) Master Theses
Depositing User: Silmi Afina Aliyan
Date Deposited: 01 Nov 2020 06:23
Last Modified: 01 Nov 2020 06:23
URI: https://repository.its.ac.id/id/eprint/55782

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