Journal
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
Volume 81, Issue 2, Pages 219-231Publisher
SPRINGER INDIA
DOI: 10.1007/s12594-013-0025-7
Keywords
Landslide density; Success rate; Agreed area; Heuristic; Bivariate; Nepal; Himalaya
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Funding
- Flemish Inter-University Council (VLIR), Belgium
- Mountain Risk Engineering Unit of Tribhuvan University
- Central Department of Geology of Tribhuvan University
- Department of Hydrology and Hydraulic Engineering of Vrije Universiteit Brussel
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The goal of this paper is to evaluate and compare the consistency of GIS-based heuristic and bivariate landslide susceptibility mapping techniques in the Himalayan region, taking the Kulekhani watershed of central Nepal as an example. For this purpose, a heuristic and two statistical bivariate landslide susceptibility mapping methods are applied, and three separate landslide susceptibility zonation maps are produced. The maps are compared using three approaches: landslide density analysis, success rate analysis, and agreed area analysis. A comparison of the values obtained from landslide density analysis and the curves of success rate analysis indicate that the two bivariate methods produce almost identical results, whereas the map produced with the heuristic method differs significantly from the others. On the other hand, the agreed area analysis highlights significant spatial differences in the maps obtained from the three methods. Although the three approaches evaluate the consistency of susceptibility maps, only the agreed area analysis is capable of spatially comparing them. Hence, this approach proves to be more suitable for spatially and quantitatively evaluating the consistency of various landslide susceptibility zonation maps.
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