Badan Pengkajian dan Penerapan Teknologi (BPPT), Indonesia
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@article{JIL22202, author = {Heru Naryanto and Hasmana Soewandita and Deliyanti Ganesha and Firman Prawiradisastra and Agus Kristijono}, title = {Analisis Penyebab Kejadian dan Evaluasi Bencana Tanah Longsor di Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Provinsi Jawa Timur Tanggal 1 April 2017}, journal = {Jurnal Ilmu Lingkungan}, volume = {17}, number = {2}, year = {2019}, keywords = {longsor, Ponorogo, curam, soil tebal, degradasi lahan, curah hujan tinggi, risiko}, abstract = { ABSTRA K Bencana tanah longsor di Indonesia semakin sering terjadi dari tahun ke tahun. Bencana tanah longsor telah terjadi di Dusun Tangkil, Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Provinsi Jawa Timur pada tanggal 1 April 2017. Lokasi tanah longsor di Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Jawa Timur, terletak pada zona kerentanan tinggi. Tipologi tanah longsor berupa longsoran bahan rombakan, yang kemudian ke arah bawah (Kali Tangkil) berkembang menjadi tipe aliran bahan rombakan. Faktor-Faktor yang berpengaruh terhadap terjadinya tanah longsor lokasi penelitian adalah: kelerengan, batuan dan tanah, rekahan/retakan batuan, konversi lahan, drainase dan keairan, curah hujan tinggi, dan aktivitas manusia. Dari kesemuanya faktor-faktor tersebut, yang paling dominan dan berpengaruh terhadap tanah longsor adalah: lereng yang curam, soil hasil pelapukan sangat gembur dan tebal, alih fungsi lahan dan curah hujan yang tinggi. Material longsoran tidak terkonsolidasi dengan baik sehingga masih mudah bergerak, dan kemungkinan pembendungan pada Kali Tangkil oleh material longsoran tersebut bisa berpotensi terjadinya banjir bandang. Beberapa permukiman yang berada di saekitar lokasi longsor mempunyai risiko tinggi dan sedang terhadap longsor, sehingga perlu dibangun kesiapsiagaan masyarakat, pembangunan sistem peringatan dini longsor serta untuk jangka panjang adalah relokasi jika memang kondisi semakin parah. Pertanian lahan kering pada lereng-lereng sebaiknya menggunakan pola agroforestry. Kawasan sub DAS berisiko longsor, sebaiknya dikembalikan fungsi lahan sebagai hutan konservasi atau hutan lindung seperti sebelumnya. Kata kunci : longsor, Ponorogo, curam, soil tebal, degradasi lahan, curah hujan tinggi, risiko ABSTRA CT Landslides in Indonesia are becoming increasingly frequent from year to year. A landslide disaster has occurred in Tangkil, Banaran Village, Pulung Sub-District, Ponorogo District, East Java Province on April 1, 2017. The location of landslides in Banaran Village, Pulung Sub-District, Ponorogo District, East Java, lies in the high vulnerability zone. The landslide typology is a debris slide, which then in the downstream direction (Tangkil River) develop into a type of debris flow. Factors that influence the occurrence of landslides in the study area are: slope, rock and soil, fracture, land conversion, drainage and irrigation, high rainfall, and human activities. Of all the influential factors, the most dominant factors for landslides are: steep slopes, weathered soil is very loose and thick, land conversion, and high rainfall. Landslide material is not well consolidated so that it is still easy to move, and the possibility of damming the Tangkil River by landslide material can potentially cause flash floods. Some settlements located near landslide locations have high and moderate risks of landslides, so community preparedness needs to be built, the establishment of landslide early warning systems and long-term relocation if the condition is getting worse. Dryland farming on slopes should use agroforestry patterns. Sub-watershed areas are at risk of landslides, the land should be restored as conservation forest or protected forest as before. Keywords : landslide, Ponorogo, steep slopes, thick soil, land degradation, high rainfall, risk }, pages = {272--282} doi = {10.14710/jil.17.2.272-282}, url = {https://ejournal.undip.ac.id/index.php/ilmulingkungan/article/view/22202} }
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ABSTRAK
Bencana tanah longsor di Indonesia semakin sering terjadi dari tahun ke tahun. Bencana tanah longsor telah terjadi di Dusun Tangkil, Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Provinsi Jawa Timur pada tanggal 1 April 2017. Lokasi tanah longsor di Desa Banaran, Kecamatan Pulung, Kabupaten Ponorogo, Jawa Timur, terletak pada zona kerentanan tinggi. Tipologi tanah longsor berupa longsoran bahan rombakan, yang kemudian ke arah bawah (Kali Tangkil) berkembang menjadi tipe aliran bahan rombakan. Faktor-Faktor yang berpengaruh terhadap terjadinya tanah longsor lokasi penelitian adalah: kelerengan, batuan dan tanah, rekahan/retakan batuan, konversi lahan, drainase dan keairan, curah hujan tinggi, dan aktivitas manusia. Dari kesemuanya faktor-faktor tersebut, yang paling dominan dan berpengaruh terhadap tanah longsor adalah: lereng yang curam, soil hasil pelapukan sangat gembur dan tebal, alih fungsi lahan dan curah hujan yang tinggi. Material longsoran tidak terkonsolidasi dengan baik sehingga masih mudah bergerak, dan kemungkinan pembendungan pada Kali Tangkil oleh material longsoran tersebut bisa berpotensi terjadinya banjir bandang. Beberapa permukiman yang berada di saekitar lokasi longsor mempunyai risiko tinggi dan sedang terhadap longsor, sehingga perlu dibangun kesiapsiagaan masyarakat, pembangunan sistem peringatan dini longsor serta untuk jangka panjang adalah relokasi jika memang kondisi semakin parah. Pertanian lahan kering pada lereng-lereng sebaiknya menggunakan pola agroforestry. Kawasan sub DAS berisiko longsor, sebaiknya dikembalikan fungsi lahan sebagai hutan konservasi atau hutan lindung seperti sebelumnya.
Kata kunci: longsor, Ponorogo, curam, soil tebal, degradasi lahan, curah hujan tinggi, risiko
ABSTRACT
Landslides in Indonesia are becoming increasingly frequent from year to year. A landslide disaster has occurred in Tangkil, Banaran Village, Pulung Sub-District, Ponorogo District, East Java Province on April 1, 2017. The location of landslides in Banaran Village, Pulung Sub-District, Ponorogo District, East Java, lies in the high vulnerability zone. The landslide typology is a debris slide, which then in the downstream direction (Tangkil River) develop into a type of debris flow. Factors that influence the occurrence of landslides in the study area are: slope, rock and soil, fracture, land conversion, drainage and irrigation, high rainfall, and human activities. Of all the influential factors, the most dominant factors for landslides are: steep slopes, weathered soil is very loose and thick, land conversion, and high rainfall. Landslide material is not well consolidated so that it is still easy to move, and the possibility of damming the Tangkil River by landslide material can potentially cause flash floods. Some settlements located near landslide locations have high and moderate risks of landslides, so community preparedness needs to be built, the establishment of landslide early warning systems and long-term relocation if the condition is getting worse. Dryland farming on slopes should use agroforestry patterns. Sub-watershed areas are at risk of landslides, the land should be restored as conservation forest or protected forest as before.
Keywords: landslide, Ponorogo, steep slopes, thick soil, land degradation, high rainfall, risk
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JURNAL ILMU LINGKUNGAN ISSN:1829-8907 by Graduate Program of Environmental Studies, School of Postgraduate Studies is licensed under a Creative Commons Attribution 4.0 International License. Based on a work at www.undip.ac.id.