KARAKTERISTIK, TIPE DAN BIDANG GELINCIR PADA ZONA LONGSOR CILOTO, JAWA BARAT BERDASARKAN ESTIMASI METODE GEODETIK
DOI:
https://doi.org/10.33332/jgsm.geologi.v20i2.166Abstract
Slip surface is delaminates between sliding material and undisturbed slope material. In limit equilibrium method, slip surface is used as reference for safety factor calculation. Landslides phenomenon can be observed using of GPS satellite technology to mitigation and material displacement monitoring. For that purpose, this research is carried out to estimate characteristic, type and slip surface position at Ciloto landslide zone by GPS survey.
First, estimation of slip surface is carried out by slope surface profile which referred to same direction of horizontal displacement of monitored points. The same direction of horizontal displacement at several monitored points indicate that the monitored points can be located at the same slip surface. Second, maximum-minimum function of geometric method and polynomial approach, including graphical method by velocity trend line plotting for each monitored point, were done to find out point position at slip surface. Ideal planar slip surface is determined by infinite slope analysis and circular slip surface is determined by circle arc analysis. Estimation of slip surface by geodetic method approach couldn't give result because geodetic data describe slope surface. By intersection of velocity trend line of monitored point, it can gave estimation of slip surface location. Geodetic approach could gave estimation of scarp position as well as crack which is indicate beginning of slip surface. Locations of scarp in vertical profile have suitability with result of geology research at same study area.
Ciloto landslide zone is classified in very slow velocity landslide (5 x 10-5 - 5 x 10-7 mm/second). The characteristic of horizontal displacement has various direction for each monitored point. Vertical displacements of monitored point have subsidence and uplift or bulging. That characteristic formed hummocky terrain and the other side of zone have gradual slope. From the research, the landslide type at Ciloto zone is multiple compound (rotational and translational) debris slides.
Keywords : geodetic method, GPS survey, landslide characteristic, landslide type, slip surface, multiple landslide, scarp
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Abidin H.Z., Andreas H., Gamal M., Kusuma M.A., Darmawan D., Surono, Hendrasto M., dan Suganda O.K., (2005) : Studying Landslide Displacements in Ciloto Area (Indonesia) Using GPS Survey Method, Jurnal, Spatial Science
Abidin H.Z., Andreas H., Gamal M., Surono, dan Hendrasto M., (2004a) : Studi Gerakan Tanah di Kawasan Rawan Longsor Ciloto (Jawa Barat) dengan Survei GPS, Jurnal, Journal JTM Vol. XI, No.1. pp. 33-40
Abidin H.Z., Andreas H., Gamal M., Surono, dan Hendrasto M., (2004b) : Studying Landslide Displacement in Megamendung (Indonesia) Using GPS Survey Method, Jurnal, Proc ITB Eng. Science. Vol 36B, No.2.pp. 109-123
Abidin H.Z., Jones A., dan Kahar J., (1995) : Survai dengan GPS, Jakarta, Pradnya Paramita, edisi I, 153 Hal.
Abramson L.W., Thomas S. L., Sharma S., dan Boyce G.M., (1996) : Slope Stability and Stabilization Methods, Kanada, John Wiley & Sons Inc, Edisi I, 629 Hal.
Anghel S., R. Paulica, B. Nicolae, L.Irina, (2001) : New Concept in Slope stability analysis, Jurnal, Technical University Gh.Asachi, Romania, http://www.ins.itu.edu.tr/2001/abstract%5c2317.htm, tgl 06/04/2002.
Bowles.J.E., dan Hainim J.K., (1984) : Sifat-Sifat Fisis dan Geoteknis Tanah (Mekanika Tanah), Jakarta, Penerbit Erlangga, Edisi 2, 578 Hal.
Coe J.A., Ellis W.L., Godt J.W., Savage W.Z., Savage J.E., Michael J.A., Kibler J.D., Powers P.S., Lidke D.J., dan Debray S., (2003) : Seasonal Movement of the Slumgullion Landslide Determined from Global Positioning System Surveys and Field Instrumentation July 1998-March 2002, Jurnal, Engineering Geology 68 (2003) 67-101.
Dikau R., Brunsden D., Schrott L., dan Ibsen M.L., (1996) : Landslide Recognition-Identification, Movement and Causes, Report No.1 of the European Comission Enviroment Programme, John Wiley and Sons, Chichester- Inggris.
Direktorat Geologi Tata Lingkungan (GTL), (1984) : Hasil Pemeriksaan Gerakan Tanah di Kampung Baru Puncak, Desa Ciloto-Kecamatan Pacet-Kabupaten Cianjur-Jawa Barat, Laporan, Direktorat Geologi Tata Lingkungan, Sub Direktorat Geologi teknik, Direktorat Jenderal Geologi dan Sumberdaya Mineral, Departemen Pertambangan dan Energi.
Environmental Geology Laboratory (elab), (2002) : Anatomy of Landslide, http://www.mnsfld.edu/depts/geogeol/elab/lsanat.htm, Department of Geology, tanggal 02/07/2002.
Gili J.A., Jordi C, Joan Rius, (2000) : Using Global Positioning System Techniques in Landslide Monitoring, Jurnal, Engineering Geology 55 (2000) 167-192.
Hartinger H. dan F.K.Brunner, (2003) : Development of a Monitoring System of Landslide Motion Using GPS, Proceding 9th FIC Symposium on Deformation Monitoring Glsztyn pp 29-38.
Hofmann-Wellenhof B., H. Lichtenegger, J.Collins, (1992) : Global Positioning System Theory and Practice, New York, Springer-Verlag wien, 326 Hal.
Japan Landslide Society (JLS), (1995) : Landslide in Japan, Jurnal, National conference of landslide control, http://www.tuat.ac.jp/~sabo/lj/image/ ljhome.gif, tanggal 26/03/2002.
Laouafa F. dan F.Darve, (2001) : Modelling of Slope Failure by a Material Instability Mechanism, Makalah, Laboratoire Sols, Solides, Structures, Geomaterial, France.
Moss J.L, (2000) : Using the Global Positioning System to Monitor Dynamic Ground Deformation Networks on Potentially Active Landslides, Jurnal, JAG, Volume 2.
Nelson Stephen A., (2002), Mass Wasting and Mass Wasting Processes, lJurna, Geology 204, Natural Disaster, Tulane University .
Owen D.R.J. dan E.Hinton, (1980) : Finite Element in Plasticity : Theory and Practice, United Kingdom, Pineridge Press Limited Swansea, 594 Hal.
Pangabean J. dan Agoes Darsoatmodjo, (1998) : Hasil Pemantauan Bencana Alam Gerakan Tanah di Daerah Ciloto dan Cianjur Selatan, Daerah Tingkat II Kabupaten Cianjur Propinsi Jawa Barat, Laporan, Bandung, Direktorat Geologi Tata Lingkungan, Direktorat Jenderal Geologi dan Sumberdaya Mineral, Departemen Pertambangan dan Energi.
Purnomo H., (1993) : Hasil Pemantauan Gerakan Tanah Daerah Ciloto, Kabupaten DATI II Cianjur Jawa Barat, Laporan, Bandung, Direktorat Geologi Tata Lingkungan, Direktorat Jenderal Geologi dan Sumberdaya Mineral, Departemen Pertambangan dan Energi.
Rachman S., Gatot M.S., Agoes D., Anas L., Supriyadi, (2001) : Pemantauan Bencana Alam Tanah Longsor di Kecamatan Pacet, Kabupaten Cianjur-Propinsi Jawa Barat, Laporan, Bandung, Direktorat Vulkanologi dan Mitigasi Bencana Geologi, Direktorat Jenderal Geologi dan Sumberdaya Mineral, Departemen Energi dan Sumber Daya Mineral.
Rizzo V., (2002) : GPS Monitoring and New Data on Slope Movement in the Maratea Valley (Potenza, Basilicata), Jurnal, Physics and Chemistry of the Earth 27 (2002) 1535-1544.
Santoso Djoko, (1990) : Longsoran pada Jalur Lipatan Kuat Batuan Sedimen Turbidit Jawa Barat sebagai Kasus Khusus Gerakan Tanah dengan Longsoran di Desa Cikareo-Majalengka sebagai Model, Disertasi, Bandung, Institut Teknologi bandung, 170 Hal.
Schuster Robert L. dan Raymond J.K., (1978) : Landslides Analysis and Control, Washington, National Academy of Sciences, 234 Hal.
Seeber Gunter, (1993) : Satellite Geodesy Foundation, Methods and Applications, Berlin, Walter de Gruyter & Co., 531 Hal.
Selby M.J., (2000) : Hillslope Materials and Processes, Oxford university press, Oxford, Edisi 2, 520 Hal.
Selby M.J., (1985) : Earth Earth's changing surface - An Introduction to geomorphology, Oxford university press, Oxford, Edisi 1, 607 Hal.
Sugalang, (1989) : Landslide in Ciloto Area West Java Indonesia, Tesis, Sweden, Department of Soil Mechanics, Luleå University of Technology, 72 Hal.
Takhmat U., Y. Sudibyo dan Edi Murtianto, (1995) : Peta Hidrogeologi Indonesia 1:100.000 Catatan Penerangan Lembar 1209-1 Bogor, Laporan, Bandung, Direktorat Geologi Tata Lingkungan, Direktorat Jenderal Geologi dan Sumberdaya Mineral, Departemen Pertambangan dan Energi.
Tzenkov T dan Slaveiko G, (2003), Geometric Analysis of Geodetic Data for Invegtigation of 3D Landslide Deformations, Makalah, Natural Hazards Review 10.1061/(ASCE) 1527-6988(2003)4:2(78).
Wahjono, Agoes D. dan Gatot M.S., (1996) : Hasil Pemantauan Gerakan Tanah di Daerah Pacet, Kabupaten Cianjur-Jawa Barat, Laporan, Bandung, Direktorat Geologi Tata Lingkungan, Direktorat Jenderal Geologi dan Sumberdaya Mineral, Departemen Pertambangan dan Energi.
Wahjono, A.Darsoatmojo, G.M. Soedrajat, (1996) : Laporan Hasil Pemantauan Gerakan Tanah Daerah Ciloto Kabupaten Dati II Cianjur Jawa Barat, Proyek Penyelidikan Geologi Tata Lingkungan dan Geologi Teknik, Direktorat Geologi Tata Lingkungan.
Yalcinkaya M. dan T. Bayrak, (2004) : Comparison of Static, Kinematic and Dynamic Geodetic Deformation Models for KutlugÃœn Landslide in Northeastern Turkey, Jurnal, Natural Hazard 34, Hal 91-95.
Zâruba Q. dan Vojtêch Mencl., (1969) : Landslides and their Control, Prague, Czechoslovak Academy of Sciences, 193 Hal.
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