Landslide susceptibility mapping at Lebir and Galas River Basins after extreme flood event using weights of evidence
2019
Mohd Hairil Mohd | Faten Nur Umaira Zainal Azman | Ahmad Jusoh | Mohd Asamudin A. Rahman
Landslides are natural disasters that cause a significant negative impact on the loss of life, property, infrastructure, organization, industry and the environment. Continuous and heavy precipitation triggered a large landslide at the Lebir and Galas River basins on end of the year 2014. The landslide debris rapidly turned into a high volume debris flow that was deposited into the river which may cause serious damage to the nearby infrastructures. The purpose of this study is to develop a landslide inventory map, to identify the critical and prone area and to produce a landslide susceptibility map for the Lebir and Galas River Basin after an extreme flood event on 2014. Landslides area was identified from aerial photograph interpretation, SPOT 5 Satellite Images and extensive field studies. Ten factors were used to generate landslide susceptibility map, including slope, aspect, geology (lithology), land use, precipitation, distance to drainage, distance to road, distance to fault, soil depth, and Normalized Difference Vegetation Index (NDVI). The landslides conditioning factors were mapped into ArcGIS, converted from vector to raster maps and analysed using Weights of Evidence (WOE) method. The importance of each factor was indicated by weight, Wi+ where positive Wi+ indicates the factor is favourable for the occurrence of landslides and vice versa. The result shows that distance to fault acquired the highest weight among other parameters (2.255814) followed by land use (1.031512) and geology (0.847892). The combination of 10 factors layer with a landslide inventory produced landslide susceptibility map.
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