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.
Geopark Karangsambung zona selatan merupakan bagian dari Geopark Karangsambung-Karangbolong yang diresmikan tahun 2018. Pada lokasi ini terdapat beberapa aspek geodiversiy, biodiversity, culturdiversity yang tersebar dibeberapa wilayah. Lokasi ini selain memiliki nilai bersejarah juga merupakan lokasi yang selalu ramai dikunjungi karena banyaknya obyek wisata. Berdasarkan sejarahnya lokasi ini pernah dilanda tsunami pada 2006 yang menyebabkan kerusakan sarana dan prasarana dibeberapa titik. Untuk menunjang pengembangan Geopark Karangsambung-Karangbolong zona selatan terkait penataan dan pengembangan wilayah perlu adanya kajian dari sisi kebencanaan. Tujuan penelitian untuk menyusun peta kerawanan wilayah terhadap tsunami sebagai masukan dalam upaya penyusunan rencana tata kelola dan pengembangan wilayah. Metode yang digunakan berupa overlay method atau tumpang susun. Parameter yang dipakai berupa jarak pantai dari sumber gempa, ketinggian daratan, kelerengan topografi, keterlindungan daratan, keberadaan pulau penghalang, morfologi garis pantai, dan jarak garis pantai. Hasil overlay diperoleh 5 kelas kerawanan dengan nilai maksimal 420 dan nilai minumum < 160 dengan rentang nilai 64. Berdasarkan hasil diketahui bahwa kelas sangat rawan meliputi Desa Ayah dan Desa Pasir dimana didalamnya terdapat banyak geosite salah satunya geosite pantai lampon. Beberapa situs (geosite, biosite, cultursite) yang masuk kedalam zona sangat rawan tsunami adalah KKG 34. Situs yang berada di dalam kelas zona rawan tsunami yaitu KKG 33, KKG 35, KKG 36, KKG 38, KKG 39, KKG 40, KKG 41, KKB 1, KKB 3, KKC 5. Situs yang masuk ke dalam kelas aman terdiri dari KKG 30 dan KKG 31. Data tersebut dapat dijadikan masukan dalam rencana tata kelola dan pengembangan di wilayah Geopark Karangsambung-Karangbolong zona selatan.
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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