Geological And Rainfall Condition As Landslide Causative Factors In Shoutern Part Of Central Java In Juni 2016

Rokhmat Hidayat, Samuel Jonson Sutanto, Moh. Deddy Munir

Abstract


On June 19, 2016, landslides occurred in some areas located in the South Central Java (Purworejo, Kebumen, and Banjarnegara). One day before the incident, there was a high intensity of rainfall in the surrounding areas. A study of the geological conditions as well as the characteristics of rainfall triggering those landslides has been carried out. Field investigations, geological analysis, and dailly to hourly rainfall analises have been conducted. Moreover, some necessary mitigation measures are discussed. The results of this study show that the main type of landslides is consisted of loosened components included in translational slides. The contact zone between weathered bedrocks and materials above causes the landslides. A porous soil in the top layer with fresh rock underneath may potentially be a sliding plane of this landslide. The different in soil thickness produces different landslide volume. Rainfall intensity during the landslide was 100-323 mm/day with intensity of 16-22 mm/hour for about 5 hours. Landslides occurred on the steep areas with slopes between 25-35. Generally, there are several measures that can be applied at the landslide sites, such as relocation of communities affected by landslides, and simple Early Warning System installed with rainfall sensor-based equipment

Keywords


Landslide; Condition of Geologist; Rainfall Pattern; Mitigations

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References


Badan Geologi, 1995, Peta Geologi Lembar Banjarnegara Pekalongan, 1408-4, 1409-1, Pusat Penelitian dan Pengembangan Geologi, Bandung

Badan Geologi, 1995, Peta Geologi Lembar Purworejo Kulonprogo, Pusat Penelitian dan Pengembangan Geologi, Bandung

Brunetti, M.T., S. Peruccacci S., Rossi M., Luciani S., Valigi D., Guzzetti F., 2010, Rainfall thresholds for the possible occurrence of landslides in Italy, Natural Hazards and Earth System Science

Chleborad A F., Baum R L., and Godt J W., 2006, Rainfall thresholds for forecasting landslides in the Seattle, Washington, Area Exceedance and probability: U.S. Geological Survey Open-File Report 2006-1064

Guzzetti F., Peruccacci S., Rossi M., and Stark C. P., 2005. Rainfall Thresholds for the Initiation of Landslides in Central And Southern Europe, Meteorology and Atmospheric Physics, Vol. 98, Issue 3-4, pp. 239-267.

Hardiyatmo, H.C., 2012, Penanganan Tanah Longsor dan Erosi, Gajah Mada University Press, Yogyakarta.

http://www.harianjogja.com/baca/2016/06/19/cuaca-ekstrem-la-nina-dipole-mode-negatif-terjadi-diy-bakal-alami-kemarau-basah-730387 diakses 26 Juni 2016

http://pusfatja.lapan.go.id/index.php/tanggapbencana/index/50 diakses 26 juni 2016

Karnawati, D., 2006, Mekanisme Gerakan Massa Batuan Akibat Gempabumi : Tinauan dan Analisa Geologi Teknik, dinamika TEKNIK SIPIL , Volume 7, Nomor 2, Juli 2007 : hal 179 190

Kaye J., Kakar R., Hou A. Y., 2013, Global Precipitation Measurement (GPM) Science Implementation Plan, Goddard Space Flight Center, Maryland

Kinasti M.A., 2014, Pengaruh Struktur Geologi Terhadap Longsor di Dusun Windusari, Desa Metawana, Kecamatan Pagentan, Kab. Banjarnegara, Prop. Jawa Tengah, Jurnal Ilmiah MTG, Vol. 7, No. 1, Januari 2014, Yogyakarta

Kyi, S.S., Nguyen, T.D., Aoki, K., Mito, Y., Suryolelono, K.B., Karnawati, D., and Pramumijoyo, S., 2007, Landslide risk microzonation by using multivariate statistical analysis and GIS. International Journal of Japanese Committee for Rock Mechanics, Vol. 3 No. 1, pp.7-15.

Lazzari M., Piccarreta M., and Capolongo D., 2013, Landslide Triggering and Lokal Rainfall Thresholds in Bradanic Foredeep, Basilicata Region (Southern Italy), Landslide Science and Practice, Springer,berlin

Muntohar A.S., 2008, Proposal Ambang Hujan untuk Peringatan Dini Tanah Longsor, Seminar/ workshop Application Research for Disaster and Humanitarian, 19 Desember 2009, University Club UGM

Nugroho U.C. Fachrudin, Suwarsono, 2014, Pemetaan Indeks Resiko longsor Menggunakan Citra DEM SRTM di Kecamatan Pejawaran, Banjarnegara, Seminar Nasional Penginderaan Jauh, LAPAN, Jakarta

Sipayung S.B., Choliawati N., Susanti I., SoniAulia R., Maryadi E., 2014, Pengembangan Model Persamaan Empiris dalam Memprediksi Terjadinya Longsor di DAS Citarum, Jurnal Sains Dirgantara Vol. 12 No. 1 Desember 2014, LAPAN Jakarta




DOI: https://doi.org/10.32679/jth.v7i2.565

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