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GIS based landslide susceptibility mapping using a fuzzy logic approach: A case study from Ghurmi-Dhad Khola area, Eastern Nepal

TitreGIS based landslide susceptibility mapping using a fuzzy logic approach: A case study from Ghurmi-Dhad Khola area, Eastern Nepal
Type de publicationJournal Article
Nouvelles publications2013
AuteursKayastha, Prabin, Subeg Man Bijukchhen, Megh Raj Dhital, and Florimond De Smedt
JournalJournal of the Geological Society of India
Volume82
Fascicule3
Pagination249 - 261
Année de publication2013
Numéro0016-7622, 0974-6889
Mots clésFuzzy operator, Geology, GIS, Hydrogeology, landslide, Nepal, susceptibility
Résumé

Landslides cause extensive loss of life and property in the Nepal Himalaya. Since the late 1980s, different mathematical models have been developed and applied for landslide susceptibility mapping and hazard assessment in Nepal. The main goal of this paper is to apply fuzzy logic to landslide susceptibility mapping in the Ghurmi-Dhad Khola area, Eastern Nepal. Seven causative factors are considered: slope angle, slope aspect, distance from drainage, land use, geology, distance from faults and folds, soil and rock type. Likelihood ratios are obtained for each class of causative factors by comparison with past landslide occurrences. The ratios are normalized between zero and one to obtain fuzzy membership values. Further, different fuzzy operators are applied to generate landslide susceptibility maps. Comparison with the landslide inventory map reveals that the fuzzy gamma operator with a γ-value of 0.60 yields the best prediction accuracy. Consequently, this operator is used to produce the final landslide susceptibility zonation map.

URLhttp://link.springer.com/article/10.1007/s12594-013-0147-y