Abstract
Abstract. Among the various natural hazards, landslide is the most widespread and damaging hazard. In recent times, throughout a lot of attention is being drawn to evaluate the risk due to landslides. The invention of remote sensing and GIS have been new vistas in the field of geo scientific studies viz. geomorphological mapping, groundwater potential mapping, disaster management etc. The present study has been undertaken to study different thematic maps like, contour, drainage, slope, aspect, curvature, DEM, DTM, drainage density, drainage intensity, geology, lineament, lineament density, lineament intensity, geomorphology, land use, weathering thickness, run off, soil thickness and buffer maps like road, drainage, lineament etc. in CNG ghat section, Gudalur, The Nilgiris. For this purpose, the satellite image IRS – RS2, LISS III January 2014 used to prepare different thematic maps. The contour, drainage and road network were incorporate from SoI Toposheets. The slope, curvature, aspects and buffer maps were prepared from GIS environments. Based on field studies, above said thematic maps (22 nos.) were prepared and were grouped into 3 categories viz. Geology, Hydrology and Terrain. In each category the input maps were assigned different score as well as each layer has been given different weightage. Finally the categories are analysed through multi – criteria analysis to find out 5 different vulnerability classes. The 5 different land susceptibility zones are classified as very low, low, moderate, high and very high. The percentages of area under different susceptibility classes are 3%, 20%, 51%, 25%, and 1% respectively. The locations of small area major landslides and slip locations were calculated from different years using (2010 and 2014) Trimble GPS in the field. The field data was converted into point layer in GIS and landslide inventory map was prepared. This map was superimposed in landslide susceptibility zonation map. As per field data 0%, 9.25%, 57.5%, 32% and 1.25% Slide points are come under very low, low, moderate, high, very high susceptibility zones respectively.
Highlights
1.1 IntroductionLandslides and other mass movements are common phenomenon in the hilly region
Several factors affect the stability of the slopes & in this paper, the geological factors such as geology, weathering thickness, lineament, lineament density, lineament intensity, lineament buffer, and hydrological factors like drainage, drainage buffer, drainage density, drainage intensity, run-off, and terrain factors like contour, slope, slope aspects, geomorphology, structure, soil, land use, etc
The use of GIS in the modelling of landslide hazard using many different parameters maps was attempted by several researchers (Reza Talaei, 2014; Nagarajan et al 1998; Sriramkumar et al 2006; Kannan et al 2011; Saranathan et al 2012; Kannan et al 2015; Saranaathan and Mani 2016; Mani and Saranaathan 2016)
Summary
Landslides and other mass movements are common phenomenon in the hilly region. The general introduction of the landslides, the various types of landslides and causes of landslides are deeply discussed by Varnes (1978). The study area landslide types are mapped by large scale spatial data, pale scars and field survey, classified and landslide distribution in GIS environment. The use of GIS in the modelling of landslide hazard using many different parameters maps was attempted by several researchers (Reza Talaei, 2014; Nagarajan et al 1998; Sriramkumar et al 2006; Kannan et al 2011; Saranathan et al 2012; Kannan et al 2015; Saranaathan and Mani 2016; Mani and Saranaathan 2016). The present study has been attempted for the identification of spatial distribution of potential slope instability in a representative hill slope over which the attributes of geological factors, hydrological factors and terrain factors
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