Tinular, Galih Wahyu (2019) Analisis Potensi Tanah Longsor Pada Daerah Tol Malang-Surabaya Dengan Metode Geolistrik Resistivitas. Sarjana thesis, Universitas Brawijaya.
Abstract
Telah dilakukan penelitian Tugas Akhir mengenai potensi terjadinya tanah longsor pada daerah lereng sisa galian bukit, di daerah proyek pembangunan jalan Tol Malang–Surabaya. Berdasarkan data geologi, daerah penelitian merupakan daerah endapan sekunder lahar gunungapi Arjuna yang tersusun atas breksi vulkanik, lava, breksi tufan, dan tuf, dan terbentuk pada periode kwarter atas. Batuan keras tersingkap secara jelas akibat proses penggalian, batuan tersebut diduga berperan sebagai bidang gelincir. Pengambilan data dilakukan dengan menggunakan metode geolistrik resistivitas konfigurasi Wenner pada lima lintasan (Line 1 – Line 5) di atas bukit tersingkapnya batuan keras tersebut. Pengolahan data menggunakan software Res2DInv. Berdasarkan pengolahan data diperoleh model penampang dua dimensi dengan nilai berkisar antara 0,036 Ωm hingga 2637,5 Ωm. Nilai ini dikategorikan menjadi tiga kategori, resistivitas rendah berkisar antara (0-30 Ωm) berupa tanah lapuk dan lempung, resistivitas sedang berkisar antara (31-500 Ωm) berupa tuf, dan resistivitas tinggi di atas 500 Ωm sebagai batuan beku diorit. Endapan tuf diduga sebagai bidang gelincir dengan perbedaan porositas dan permeabilitas dengan lapisan tanah lapuk diatasnya. Derajat kemiringan bidang gelincir ditemukan pada Line 1 yaitu 2,6o ke arah Timur, Line 3 yaitu 13,5° ke arah Utara, dan Line 4 yaitu 8,34° dan 16,35° dengan arah yang sama yaitu ke arah Timur. Terdapat tiga lokasi berpotensi terjadi tanah longsor dengan satu lokasi yang dikategorikan sangat berpotensi berada di lereng sebelah Selatan. Faktor utama lainnya yang dapat memicu terjadi longsor adalah intesitas hujan yang lebat.
English Abstract
Final project research has been carried out regarding the potential for landslides in the remaining slopes of hill excavation, in the area Malang-Surabaya toll road construction project. Based on geological data, the study area is a secondary sedimentary area of Arjuna volcanic lava which is composed of volcanic breccia, lava, tuffaceous breccia, and tuff, and formed in the upper quarter period. Hard rock is clearly exposed due to the excavation process, the rock is thought to act as a slip plane. Acquisition of data was carried out using the geoelectric resistivity method of Wenner configuration on five tracks (Line 1 - Line 5) on the exposed rock hard hill. Data processing uses the Res2DInv software. Based on data processing, a two-dimensional cross section model with values ranging from 0.036 Ωm to 2637.5 Ωm was obtained. This value is categorized into three categories, low resistivity ranges from (0-30 Ωm) in the form of weathered and clay soils, medium resistivity ranges from (31-500 Ωm) in the form of tuffs, and high resistivity above 500 Ωm as igneous rock diorit. Tuff deposits are thought to be skid fields with differences in porosity and permeability with the weathered soil layer above. The degree of slope of the slope is found on Line 1 which is 2.6o to the East, Line 3 which is 13.5° to the North, and Line 4 which is 8.34° and 16.35° in the same direction namely to the East. There are three potential landslides with one location categorized as potentially on the Southern slope. Another major factor that can trigger landslides is heavy rainfall intensity.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/MIPA/2019/323/051910994 |
| Uncontrolled Keywords: | Tanah longsor, resistivitas, konfigurasi Wenner, bidang gelincir. Landslide, resistivity, Wenner configuration, slip surface. |
| Subjects: | 500 Natural sciences and mathematics > 537 Electricity and electronics |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika |
| Depositing User: | Budi Wahyono Wahyono |
| Date Deposited: | 10 Aug 2020 08:14 |
| Last Modified: | 10 Aug 2020 08:14 |
| URI: | http://repository.ub.ac.id/id/eprint/179469 |
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