Remote Sensing and GIS for Landslide Vulnerability Studies in the Kodaikanal Hills,...

Remote Sensing and GIS for Landslide Vulnerability Studies in the Kodaikanal Hills, South India

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P. Amirdha Priyadharshini
student
INSTITUTE OF REMOTE SENSING , ANNA UNIVERSITY,
Email: [email protected]

M . SUDHA
STUDENT
INSTITUTE OF REMOTE SENSING , ANNA UNIVERSITY
Email: [email protected]

S.SANJEEVI
PROFESSOR AND HEAD
DEPARTMENT OF GEOLOGY, ANNA UNIVERSITY
Email: [email protected]

S.JAYASEELAN
SCIENTIST
ISRO REMOTE SENSING CENTRE , SATHYABAMA UNIVERSITY
Email: 

Landslides are caused in hilly terrains due to factors like gravity, weathering, deforestation, earthquake, heavy precipitation etc, and result in loss to property and life. Landslides often affect Kodaikanal, a well-known tourist hill resort in south India, during the monsoons. The hills in Kodaikanal have a fairly thick weathered overburden that tend to slide during heavy downpour. Therefore the frequency of landslides in these areas is higher.

This paper presents the results of a remote sensing and GIS based approach to map and study the causative factors of the Kodaikanal landslides. The methodology involves generation of geomorphic map, NDVI map, soil map, slope map, DEM, drainage and lineament map, landuse/landcover change map. LANDSAT TM and ASTER images have been used to generate a few of these thematic maps. Existing literature have also been referred to generate the thematic maps. To identify the vulnerable areas, the above-mentioned parameters were analyzed in a GIS by assigning appropriate ranks and weights.

The result is a landslide hazard zonation map showing regions with varying degrees of vulnerability to landslides. It is opined that such a map (which is derived from the analysis of the causative factors) will enable to propose and implement suitable mitigating measures, thus preventing loss of life and property in the Kodaikanal hills.