Critical land has become a problem in the world. Critical land is very detrimental to the health of the land. Several factors cause the land to become critical. One of them is the use of land that is not by the capabilities of the land. If no repairs made, the land will be physically, chemically, and biologically damaged. Klaten Regency is one of the regencies in Central Java Province, which has quite extensive critical land. It is necessary to monitor and improve land quality regularly to avoid critical land problems. Data and information on critical land obtained from Klaten Regency processed into a decision support system. Decision Support System uses a combination of Analytical Hierarchy Process (AHP) and Technique For Order Preference by Similarity to Ideal Solution (TOPSIS) methods. In this research, a Web-based Decision Support System created to determine the critical land area in Klaten Regency. The information system created has an alternative menu and criteria that determine the potential of critical land in Klaten Regency, making it easier for users to obtain information.
Kabupaten Kendal, Jawa Tengah memiliki riwayat longsor 206 kejadian pada 2010-2020, menyebabkan 41 bangunan rusak dan 28 warga mengungsi. Hal ini menunjukkan bahwa longsor adalah kejadian yang serius dan perlu menjadi perhatian. Peta resmi kerentanan longsor oleh PVMBG dan Badan BPBD Kabupaten Kendal berskala regional perlu pembaruan kelengkapan data dan informasi. Penelitian bertujuan membuat zona potensi longsor untuk rekomendasi perencanaan dan pembangunan. Citra SPOT 6 dan 7 digunakan untuk interpretasi penggunaan lahan, curah hujan dari citra Himawari-8 2019, interpretasi litologi dan kelurusan (divalidasi dari data Pusat Survey Geologi 2013 dan lapangan), serta kemiringan lereng dari DEM. Kalkulasi merupakan kombinasi klasifikasi DVMBG 2004, BBPPSDLP 2009, dan PVMBG 2015. Zona potensi longsor rendah (44,05% atau 44.220 Ha) meliputi Kota Kendal, Patebon, Kaliwungu Utara, Brangsong, Kangkung, Patebon, Cepiring, Rowosari, Weleri dan Pegandon bagian utara, Gemuh bagian utara, Ringinarum bagian utara. Zona potensi longsor sedang (50,47% atau 50.661 Ha) meliputi Kaliwungu Selatan, Boja, Plantungan bagian utara, Sukorejo bagian utara, Pegandon bagian selatan, Gemuh bagian selatan, Ngampel bagian utara, Ringinarum bagian selatan, dan Patean bagian selatan. Potensi longsor tinggi (5,48% atau 5.500 Ha) meliputi Singorojo bagian utara dan barat, Sukorejo bagian selatan, Plantungan bagian selatan, Pageruyung bagian timur, Limbangan barat dan selatan, serta Patean bagian utara. Potensi longsor sangat tinggi (0,001% atau 1,3 Ha) meliputi daerah Sumber Rahayu dan Sriwulan Limbangan.
Movement of soil and rock masses down the slope or known as landslide is a natural activity that can pose a danger to humans. Generally, landslide can be influenced by the slope, slope materials (rock/soil), and rainfall. Morphologically, the study area, which is located in the borders of Tembalang and Banyumanik Districts, Semarang City, is a hill that is quite steep. It has a potential to experience landslides. Landslide occurences at the study area do not always occur on steep slopes. Therefore, the aim of this study is to determine the relationship between the slope materials and the occurrences of landslide. Data was obtained through mapping to determine geological conditions and enlisting landslide occurrences at the study area. Furthermore, the correlation between the number of occurrences and the type of slope materials at the location of the ground motion was carried out using information value method. Based on geological mapping, 5 types of lithology were obtained, namely: alluvium, breccia, sandstone, siltstone, and claystone. Out of 10 landslides that were found, 6 of them occurred in claystone lithology. We interpret that landslide occurrences in study area are relating to the lithology claystone with information value 0.416. The claystone, a part of the Kerek Formation, physically were easily degraded. In addition, this lithology mostly found in open slopes, where the process of erosion by water is more intense.
Kabupaten Magelang merupakan salah satu wilayah di Indonesia yang memiliki intensitas longsor tinggi. Selama tahun 2017-2019 terjadi tanah longsor sebanyak lebih dari 500 kejadian di Kabupaten Magelang. Berdasarkan hal tersebut, penelitian ini berupaya untuk memberikan gambaran persebaran daerah rawan longsor pada Kabupaten Magelang. Penelitian ini menggunakan 4 parameter penyebab terjadinya tanah longsor yaitu parameter kelerengan, parameter litologi, parameter curah hujan, dan parameter tutupan lahan. Parameter tersebut didapatkan dari beberapa metode yang meliputi: pengolahan data citra penginderaan jauh, pengolahan data sistem informasi geografis, dan validasi lapangan. Hasil dari tiap parameter kemudian diberikan bobot dengan menggunakan metode Analytical Hierarchy Process (AHP) untuk mendapatkan hasil akhir berupa peta rawan longsor. Berdasarkan hasil pengolahan yang dilakukan, diketahui sebanyak 10 kecamatan pada Kabupaten Magelang memiliki kelas rawan longsor tinggi, 5 kecamatan termasuk pada kelas sedang, dan 6 kecamatan lainnya termasuk dalam kelas rendah. Tahap validasi dilakukan dengan membandingkan hasil analisis peta dengan data kejadian tanah longsor Kabupaten Magelang 3 tahun terakhir menggunakan matriks konfusi. Hasil dari validasi peta sebaran daerah rawan longsor memiliki akurasi 80,95%, yang artinya tingkat akurasi antara data hasil analisis peta dengan data validasi lapangan baik.
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