Potensi Kandas Batuan Berdasarkan Metode Markland, dan Zona Rawan Longsor di Daerah Kaliwader, Kecamatan Bener, Kabupaten Purworejo, Jawa Tengah

Sari Bahagiarti Kusumayudha, Azwar Thamrin, Heru Sigit Purwanto

Abstract


Daerah penelitian secara administratif berada di Kecamatan Bener, Kabupaten Purworejo, Jawa Tengah. Secara geomorfologi, bentuk lahan daerah tersebut terdiri dari Perbukitan Struktural (S1), Lembah Homoklin (S2), Dataran Alluvial (F1), Tubuh Sungai (F2), dan Dataran Limpah Banjir (F3). Lito-stratigrafi daerah penelitian mulai dari batuan tertua, disusun oleh Satuan Breksi-vulkanik Kaligesing, Satuan Lava-andesit Kaligesing, kedua satuan berumur Oligosen Akhir hingga Miosen Awal, Satuan Batugamping-pasiran Sentolo berumur Miosen Tengah – Pliosen Awal (N14 – N19), dan Satuan endapan alluvial berumur recent. Di daerah penelitian juga dijumpai intrusi andesit berumur Oligosen Akhir – Miosen Awal. Struktur geologi berupa kekar dan sesar secara umum mempunyai orientasi Timurlaut – Baratdaya termasuk reverse left slip fault, dan Baratlaut – Tenggara, merupakan right lateral slip fault. Dari hasil analisis kestabilan lereng terhadap enam lokasi lereng batu berdasarkan metode Markland, diketahui bahwa lereng Wadas berpotensi longsor tipe wedge failure dan planar slide, lereng Kaliwader 1 berpotensi longsor tipe wedge failure, lereng Kaliwader 2 berpotensi longsor tipe wedge failure, lereng Kaliwader 3 berpotensi longsor tipe wedge failure, lereng Kaliwader 4 tidak berpotensi longsor, dan lereng Ngargosari berpotensi terjadi longsoran tipe wedge failure dan tipe planar slide. Penanggulangan longsor dapat dilakukan dengan melakukan pelandaian lereng dan atau metode trap/terasering.

Keywords


Kandas Batuan, Metode Markland, Wedge Failure, Planar Slide

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DOI: https://doi.org/10.31315/jmel.v3i2.2190

DOI (PDF): https://doi.org/10.31315/jmel.v3i2.2190.g2473

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