Abstract
Nilgiris district of Tamil Nadu, India, is one of the landslide-prone zones. In recent years, this district has suffered a lot from landslides. A study was done using the geospatial technology–based analytical hierarchical process (AHP) model, a multi-criteria approach integrated with representation operating characteristics (ROC)–area under curve (AUC) validation technique to map the landslides susceptible zones of this district. The weights of the landslide triggering (or influencing or inducing) factors (criteria) obtained the AHP model are slope (0.377), geology (0.281), distance from the faults (0.119), distance from the drainage (0.071), rainfall (0.062), Land Use Land Cover (LULC) (0.039), elevation (0.027), and slope aspect (0.023). The obtained weights of respective influencing factors of this region illustrate their priorities in the order from very high to very low with a Consistency Ratio (CR) value equal to 0.07 (< 0.1) that indicates the acceptability of the weightage. Resulted landslide-susceptible (potential) zones of this district have revealed that 22.65% of the study area is very low susceptible, whereas 20.17%, 15.88%, 13.32%, and 27.98% of the regions are low, medium, very highly vulnerable to landslides, respectively. It was also found that the Udagamandalam block (north-central part of the Nilgiris district) is the most susceptible to landslides where Gudalur (north-west) is the least susceptible block. However, Coonoor (south-east) and Kotagiri (north-east) have acquired the second and third places, respectively. The empirical and binormal ROC curve estimates the accuracy nearly equal, i.e., 75.35% and 75.36%, respectively, that signifies the good performance of the AHP model in this region. Obtained landslide susceptible map of Nilgiris can be further used by the local or state or central authorities to make the policies and planning for the sustainable development of the region.
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