Evaluation of the consistency of landslide susceptibility mapping: a case study from the Kankai watershed in east Nepal |
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Authors: | Prabin Kayastha Megh Raj Dhital Florimond De Smedt |
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Affiliation: | 1. Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel, 1050, Brussels, Belgium 2. Mountain Risk Engineering Unit, Tribhuvan University, Kirtipur, Kathmandu, Nepal 3. Central Department of Geology, Tribhuvan University, Kirtipur, Kathmandu, Nepal
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Abstract: | GIS-based landslide susceptibility maps for the Kankai watershed in east Nepal are developed using the frequency ratio method and the multiple linear regression technique. The maps are derived from comparing observed landslides with possible causative factors: slope angle, slope aspect, slope curvature, relative relief, distance from drainage, land use, geology, distance from faults and mean annual rainfall. The consistency of the maps is evaluated using landslide density analysis, success rate analysis and spatially agreed area approach. The first two analyses produce almost identical quantitative results, whereas the last approach is able to reveal spatial differences between the maps and also to improve predictions in the agreed high landslide-susceptible area. |
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