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All Journal Bulletin of Scientific Contribution : Geology Journal of Geosciences and Applied Geology
Aruan, Immanuel Hareanto
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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PETA RAWAN LONGSOR DESA NANGGERANG, KECAMATAN SUKASARI, KABUPATEN SUMEDANG, JAWA BARAT MENGGUNAKAN ANALISIS KESTABILAN LERENG TIGA DIMENSI Aruan, Immanuel Hareanto; Yuniardi, Yuyun; Khoirullah, Nur; Sophian, Raden Irvan
Bulletin of Scientific Contribution Vol 22, No 2 (2024): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i2.55505

Abstract

Pada tanggal 3 Februari 2024, terjadi longsor di Desa Nanggerang, Kecamatan Sukasari, Kabupaten Sumedang, Provinsi Jawa Barat. Longsor ini terjadi di lereng persawahan masyarakat setempat. Berangkat dari hal ini, dilakukan penelitian mengenai peta kerawanan longsor lereng lokal di Desa Nanggerang untuk memberikan informasi kepada masyarakat setempat mengenai potensi longsor yang ada. Penelitian dilakukan menggunakan analisis kestabilan lereng tiga dimensi (3D) dengan perangkat Rocscience Slide 3. Geometri lereng diidentifikasi menggunakan proses fotogrametri yang diakuisisi oleh pesawat nirawak. Sedangkan lapisan yang dibagi, yaitu top soil OH, tanah MH, dan batuan andesit terlapukkan, diidentifikasi melalui observasi lapangan dan uji laboratorium mengenai sifat fisik dan mekaniknya. Dengan memasukkan index properties ke dalam model 3D lereng hasil proses fotogrametri, perhitungan kestabilan lereng menggunakan metode Janbu dilakukan untuk mendapatkan peta rawan longsor di daerah penelitian. Hasil komputasi menunjukkan, lereng di Desa Nanggerang berada pada kondisi stabil pada kondisi kering (FK = 1,5). Sedangkan pada kondisi jenuh dan pseudo-statis lereng mengalami keruntuhan (FK <1). Oleh karena itu, disarankan untuk mengefisiensikan penggunaan lahan dan aliran pada persawahan guna mengurangi risiko terjadinya longsor.
ANALYSIS OF LANDSLIDE CAUSES IN NANGGERANG VILLAGE, SUKASARI SUB DISTRICT, SUMEDANG REGENCY THROUGH IDENTIFICATION LANDSLIDE SLOPE MATERIAL CHARACTERISTICS Aruan, Immanuel Hareanto; Yuniardi, Yuyun; Khoirullah, Nur; Sophian, Raden Irvan
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.56627

Abstract

On February 3, 2024, a landslide occurred in Nanggerang Village, Sukasari District, Sumedang Regency, West Java Province. The landslide took place on the slopes of local farmland. This event was investigated through an analysis of the characteristics of the landslide material collected immediately after the landslide to determine its cause and mechanism. The landslide slope was divided into three units based on the type and degree of weathering: topsoil (OH), silt soil (MH), and weathered tuff rock. Three undisturbed samples were used in laboratory experiment to determine the materials’ physical characteristics. The physical characteristics of the two soil units, which included silt-sized grains, a specific gravity of roughly 2.6, a unit weight ranging from 21 to 45 kN/m3, and a plasticity index of 16 to 20, were not substantially different, according to the results of the laboratory tests. For the tuff rock, the unit weight was 17.31, water content 48.8, and specific gravity 22.7. The laboratory test results, and studio analysis found that the high water content in the soil due to rainfall caused the two soil units to exceed their liquid limit, resulting in a translational (arc) landslide. The presence of clay minerals due to weathering acted as a catalyst for the landslide. The addition of water from heavy rainfall made the material more fluid, changing the type of landslide to an earth flow.
Co-Authors Khoirullah, Nur Raden Irvan Sophian, Raden Irvan Yuyun Yuniardi