Laporkan Masalah

Hydrological-slope stability modelling for landslide hazard assessment by means of GIS and remote sensing data :: A case study of Probolo sub-catchments, Gesing sub-district Purworejo Regency, Indonesia

CHRISTANTO, Nugroho, Dr. Junun Sartohadi, M.Sc

2008 | Tesis | S2 Geo-Informasi untuk Manajemen Bencana

Landslides are main natural hazards occurring on mountainous area situated in the wet tropical climate like in Indonesia. The study area, Probolo Sub Catchments, as a part of Menoreh Mountains is one of representative example of Indonesian region facing landslides problem. Several catastrophic landslides induced by rainfall are every year reported from different parts of Probolo sub-catchments. This study attempted to simulate slope stability in Probolo sub-catchments using deterministic modeling by means of PC Raster® simulation. Coupled models of STARWARS and PROBSTAB were used in this research in order to simulate the dynamic of slope stability (van Beek 2002 and Sekhar 2006). The slope stability modeling was based on infinite method. In order to run these models, high precision and resolution of DEM were needed. Hence, the combination between topographic map, DGPS measurement and Laser scanning survey were carried. Volumetric moisture content and groundwater level were simulated from STARWARS model while the PROBSTAB simulated the slope stability and probability of failure. Sensitivity analysis was applied to evaluate the model. The result of hydrological sensitivity analysis shows that soil depth was the most sensitive parameters. For the slope stability modeling, the most sensitive parameter was slope and followed by friction angle and cohesion. Overall slope stability simulation shows that the area categorized as unstable, critical and stable are 11.32%, 31.86% and 56.82% respectively. Model validation, done by using Yin and Yan equation shows that the accuracy of the model reached 20.5 %. This poor result of model was probably caused by the poor quality of input data and field observation. How ever, the results of dynamic modeling are ideal for landslide hazard assessment. Dynamic modeling software such as PC Raster® that are open source and free software are reliable alternatives to others commercial software.

Kata Kunci : Pemodelan dinamik,Penilaian bencana longsor lahan,PC Raster,PROBSTAB,Penilaian bencana longsor lahan,PCRaster,STARWARS,PROBSTAB


    Tidak tersedia file untuk ditampilkan ke publik.