Wisnumurti, Danang (2015) SEBARAN INDEKS BAHAYA EROSI PADA KAWASAN RAWAN BENCANA ERUPSI MERAPI DI DESA KEPUHARJO KECAMATAN CANGKRINGAN KABUPATEN SLEMAN. Other thesis, UPN "VETERAN" YOGYAKARTA.
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Abstract
Kepuharjo village located approximately 10 km from the Summit of Mount Merapi with the majority of the young soils comes from the material result of the eruption of Mount Merapi. The new soils did not yet have a steady aggregate due to the womb clays and organic materials low which makes the lack of power between connective particles so it is easy to be further eroded. The topography of steep and sloping up to a factor of vegetation around the troubled aftermath of the eruption that occurred in the village of Kepuharjo due to Disaster-prone Regions are in a eruption of Mount Merapi causes soil against erosion sensitivity can occur becomes larger. The rationale for this research was conducted to determine the magnitude of erosion that occurred, erosion hazard levels as well as the spread of erosion hazard index displayed in the form of a map of the distribution by using software arcview 3.3. The research was carried out in July-October 2014. Research method was purposive sampling to determine the point of deliberately sampling a map overlay results two land units map the map slope slopes and land use maps. Erosion prediction method using USLE (Universal Soil Loss Equation) with parameters of observation rainfall erosivity (R), soil erodibility (K), slope length and slope tilt (LS), crop factors (C) and conservation activity (P), bulk density (BV) and soil solum thickness. The results showed the level of erosion hazards are divided into three classes, 59% of the territory of the village of Kepuharjo including very light, 25% including medium and 16% including weight. While the spread of erosion hazard index are divided into four classes, 60% of the region including low, 20% of the medium, 10% of the region is high, and 10% of the region is very high. Slope, vegetation and conservation measures, is the most influential factor of the amount of erosion that occurred. Keywords: Erosion hazard level, Erosion hazard index, USLE Desa Kepuharjo terletak ± 10 km dari puncak Gunung Merapi dengan mayoritas tanah muda yang berasal dari material hasil erupsi Gunung Merapi. Tanah baru tersebut belum memiliki agregat yang kuat karena kandungan lempung serta bahan organik rendah yang membuat kurangnya daya ikat antar partikel sehingga mudah tererosi. Kondisi topografi yang landai hingga curam serta faktor vegetasi sekitar yang terganggu akibat erupsi yang terjadi di Desa Kepuharjo karena berada dalam Kawasan Rawan Bencana (KRB) erupsi Gunung Merapi menyebabkan kepekaan tanah terhadap erosi yang dapat terjadi menjadi lebih besar. Atas dasar pemikiran tersebut penelitian ini dilakukan untuk mengetahui besarnya erosi yang terjadi, tingkat bahaya erosi (TBE) serta sebaran indeks bahaya erosi (IBE) yang ditampilkan dalam bentuk peta sebaran dengan menggunakan software arcview 3.3. Penelitian dilakukan pada bulan Juli-oktober 2014. Metode penelitian adalah purposive sampling dengan menentukan titik pengambilan sampel secara sengaja dari peta satuan lahan hasil overlay dua peta yaitu peta kemiringan lereng dan peta penggunaan lahan. Prediksi Erosi menggunakan metode USLE (Universal Soil Loss Equation) dengan parameter pengamatan erosivitas hujan (R), erodibilitas (K), faktor panjang dan kemiringan lereng (LS), faktor pertanaman (C) serta tindakan konservasi (P), berat volume tanah (BV) serta tebal solum tanah. Hasil penelitian menunjukkan tingkat bahaya erosi terbagi dalam tiga kelas, 59% wilayah Desa Kepuharjo termasuk sangat ringan , 25% termasuk sedang dan 16% termasuk berat. Sedangkan sebaran indeks bahaya erosi terbagi dalam empat kelas, 60% wilayah termasuk rendah, 20% wilayah sedang, 10% wilayah tinggi, dan 10% wilayah sangat tinggi. Faktor kemiringan, vegetasi serta tindakan konservasi merupakan faktor yang paling berpengaruh terhadap besarnya erosi yang terjadi. Kata Kunci : IBE, TBE, USLE
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | S Agriculture > S Agriculture (General) |
| Divisions: | Faculty of Medicine, Health and Life Sciences > School of Biological Sciences |
| Depositing User: | Darsini Darsini |
| Date Deposited: | 17 Jun 2016 03:25 |
| Last Modified: | 17 Jun 2016 03:25 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/3912 |
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