Protected areas whose function have been converted became problems in many regions. The cause of landslides is still being studied whether it is natural conditions or human contributions, namely land use changes. Investigation of land use change events play an important role in environmental sustainability. The purpose of this study was to determine the effect of land use change in protected areas against landslides. The method used is a surveillance method. The data is processed using non-parametric statistical tests by comparing the level of landslide hazards in areas where there is no land function conversion with those that have land function conversion. The data description shown that 58% of the protected function area in Samigaluh District had the potential for high landslides. The results obtained shown that there was a significant difference in the level of landslide hazard between areas with and without land function conversion. So that the land conversion that occurred in the protected forest in Samigaluh District had a significant effect on landslides as evidenced by the asymp sig (0.031) <p-value (0.05). This result becomes consideration for the local government in monitoring protected forests for environmental sustainability.
Changes in the river morphology require knowledge of the suite of drivers that control it, whether natural or human. The study aims to analyze the anthropogenic influences on morphological changes in the Progo River using Google Earth Images. It is essential to know the recent changes in the morphology of the Progo River so that stakeholders can make policies to control human activities that influence the morphology changes of the Progo River. The study area is located in Bantul Regency, Daerah Istimewa Yogyakarta Province, Java Island, Indonesia. The size of the Progo River watershed is around 17,432 square kilometers. Google Earth Images analysis is carried out to analyze the morphological changes of the Progo River from 2012 to 2019. The result shows that land-use changes due to dam construction affected the sediment supply downstream of the dam. In addition, land-use changes around the Progo River due to the opening of agricultural land and settlement areas had an effect on decreasing the infiltration area, so that the number of trees holding the soil from erosion was reduced, producing more eroded sediment that flowed to the river. Sand mining in the river could cause the deepening of water depths and a decrease in the average height of the riverbed.
ABSTRAK Kondisi geografis Indonesia yang heterogen dengan kemiringan cukup tinggi menjadi potensi terjadinya bencana tanah longsor. Meskipun tanah longsor terjadi juga karena faktor yang memicu seperti curah hujan dan tata guna lahan. Daerah yang kerap terjadi tanah longsor yaitu Kecamatan Samigaluh Kabupaten Kulon Progo. Menganalisa penyebab terjadinya tanah longsor di daerah tersebut menjadi penting dilakukan agar penanganan dan pengendalian dilakukan sedini mungkin. Faktor pengontrol yang dianalisa yaitu kelerengan, litologi, kerapatan vegetasi dan jenis tanah sedangkan faktor pemicu yaitu curah hujan dan tata guna lahan. Tujuan dari penelitian ini untuk mengetahui seberapa besar faktor pengontrol dan pemicu tersebut terhadap terjadinya tanah longsor di Kecamatan Samigaluh Kabupaten Kulon Progo. Penelitian melalui beberapa tahapan yaitu pengambilan data primer dilapangan dan data sekunder yang didapatkan dari peta rupa bumi Indonesia, peta geologi dan pengolahan citra landsat. Analisa data dilakukan secara kuantitatif menggunakan AHP (Analytical Hierarchy Process). Hasil penelitian menunjukkan bahwa faktor kelerengan menjadi penyebab terbesar terjadinya tanah longsor di Kecamatan Samigaluh yaitu 33,3%, curah hujan 22,8%, litologi 17%, tata guna lahan 11,8%, kerapatan vegetasi 8,8% dan jenis tanah 5,8%. Dengan diketahuinya penyebab terjadinya tanah longsor diharapkan masyarakat lebih berhati-hati dalam pemilihan lahan permukiman serta pemerintah dapat membuat kebijakan tentang pola tata ruang.Kata kunci: AHP, Kelerengan, Samigaluh,Tanah longsor ABSTRACT The heterogeneous geographical condition of Indonesia with a fairly high slope is a potential for landslide disasters. Although landslides also occur due to triggering factors such as rainfall and land use. Areas that often occur landslides are Samigaluh District, Kulon Progo Regency. Analyzing the causes of landslides in the area is important so that handling and control is carried out as early as possible. The analyzed controlling factors were slope, lithology, vegetation density and soil type, while the trigger factors were rainfall and land use. The purpose of this study was to determine how much the controlling and triggering factors for the occurrence of landslides in Samigaluh District, Kulon Progo Regency. The research went through several stages, namely primary data collection in the field and secondary data obtained from Indonesian topographic maps, geological maps and landsat image processing. Data analysis was carried out quantitatively using AHP (Analytical Hierarchy Process). The results showed that the slope factor was the biggest cause of landslides in Samigaluh District, namely 33.3%, rainfall 22.8%, lithology 17%, land use 11.8%, vegetation density 8.8% and soil type 5,8%. By knowing the causes of landslides, it is hoped that people will be more careful in choosing residential land and the government can make policies on spatial patterns. Keywords: AHP, Slopes, Samigaluh, Landslide
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