Wardhani, Dena Prapanca (2021) Penentuan Jalur Alternatif Menghindari Daerah Rawan Longsor Menggunakan Sistem Informasi Geografis (Studi Kasus: Kabupaten Pesisir Selatan, Sumatera Barat). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Tanah longsor merupakan salah satu bencana alam yang cukup sering terjadi di Kabupaten Pesisir Selatan. Menurut Badan Geologi, Pusat Vulkanologi dan Mitigasi Bencana Geologi, pada Agustus 2015, Seluruh wilayah di Kabupaten Pesisir Selatan terbagi ke dalam tingkat menengah hingga tinggi untuk pergerakan tanahnya. Hal ini mengakibatkan kerugian yang cukup besar, diantaranya infrastruktur transportasi berupa jalan dimana salah satu aspek yang penting dan vital untuk mempercepat laju pembangunan nasional. Letak Kabupaten Pesisir Selatan yang berperan penting sebagai penghubung antar daerah bahkan antar provinsi juga sangat berperan, sehingga diperlukan suatu tindakan yang dapat menjadi alternatif untuk menghindari kerugian akibat bencana tanah longsor dan rusaknya infrastruktur jalan di wilayah tersebut.
Pada studi ini, dilakukan analisis untuk mengetahui daerah rawan longsor dengan metode skoring dan pembobotan pada parameter-parameter, yakni tutupan lahan, curah hujan, geologi atau jenis tanah dan kemiringan tanah. Melalui Parameter tersebut, diperoleh informasi potensi longsor dengan rentang 0,8-1,375 dikategorikan rendah, 1,375-1,95 kategori menengah, 1,95-2,525 untuk kategori tinggi dan rentang 2,525-3,1 untuk kategori sangat tinggi. Kondisi eksisting Kabupaten Pesisir Selatan mengakibatkan tingkat potensi tanah longsor yang tinggi diseluruh wilayahnya ditambah oleh keadaan parameter-parameter yang dapat mendukung kondisi tersebut. Melalui hasil potensi tanah longsor, dilakukan penentuan untuk pembuatan jalan baru sebagai jalur alternatif saat terjadi bencana tanah longsor menggunakan proximity analysis berbasis (Sistem Informasi Geografis) SIG. Jalur alternatif yang dihasilkan melalui metode ini sepanjang 214,535 km dan termasuk kedalam kategori Jalan Nasional. Dimana ruas jalur alternatif ini melalui 13 kecamatan yang ada di Kabupaten Pesisir Selatan. Jalur ini memiliki keefektifan lebih baik dalam menghindari daerah rawan longsor, dan dari panjang ruas jalan yang lebih pendek daripada ruas jalan nasional yang telah ada. Adanya peta potensi tanah longsor serta penentuan jalur alternatif diharapkan dapat meningkatkan kewaspadaan pengguna jalan terhadap adanya potensi tanah longsor, serta rekomendasi pengalihan jalur apabila terjadi terputusnya akses jalan akibat bencana tanah longsor.
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Landslides is one of the natural disasters that often occur in Pesisir Selatan Regency. According to the Geological Agency, Center for Volcanology and Geological Hazard Mitigation, in August 2015, all areas in Pesisir Selatan Regency were divided into medium to high levels for soil movement. This resulted in considerable losses, including transportation infrastructure in the form of roads which is one of the important and vital aspects to accelerate the pace of national development. The location of the Pesisir Selatan Regency which plays an important role as a liaison between regions and even between provinces is also very important, so that an alternative action is needed to avoid losses due to landslides and damage to road infrastructure in the region.
In this study, an analysis was carried out to determine areas prone to landslides by scoring and weighting the parameters, namely land cover, rainfall, geology or soil type and soil slope. Through these parameters, information on landslide potential is obtained with a range of 0.8-1,375 in the low category, 1.375-1.95 in the medium category, 1.95-2,525 for the high category and the range of 2.525-3.1 for the very high category. The existing condition of Pesisir Selatan Regency has resulted in a high level of potential for landslides throughout its territory, coupled with the condition of parameters that can support these conditions. Based on the results of potential landslides, a determination was made for the construction of a new road as an alternative route in the event of a landslide using proximity analysis based on GIS (Geographical Information System). The alternative route generated by this method is 214,535 km long and is included in the National Road category. Where this alternative route passes through 13 sub-districts in Pesisir Selatan Regency. This route has better effectiveness in avoiding landslide-prone areas, and from a shorter length of road section than the existing national roads. The existence of a map of the potential for landslides and the determination of alternative routes are expected to increase the awareness of road users against the potential for landslides, as well as recommendations for route diversion in the event that road access is interrupted due to landslides.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Jalur Alternatif, Proximity Analysist, Sistem Informasi Geografis (SIG), Skoring dan Pembobotan, Tanah Longsor Alternative Route, Proximity Analysist, Geographic Information System (GIS), Scoring and Weighting, Landslide |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) G Geography. Anthropology. Recreation > G Geography (General) > G70.212 ArcGIS. Geographic information systems. |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis |
| Depositing User: | Dena Prapanca Wardhani |
| Date Deposited: | 13 Aug 2021 07:22 |
| Last Modified: | 13 Aug 2021 07:22 |
| URI: | http://repository.its.ac.id/id/eprint/86195 |
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