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Space-Time Integrated Landslide Hazard Zonation near Tehri Dam in Uttarakhand, India: Integrated Landslide Hazard Zonation
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Author(s): Pooja Rana (Sphere India, India), Jeganathan Chockalingam (Birla Institute of Technology, India)and Arvind Chandra Pandey (Central University of Jharkhand, India)
Copyright: 2017
Pages: 25
Source title:
Remote Sensing Techniques and GIS Applications in Earth and Environmental Studies
Source Author(s)/Editor(s): Abhisek Santra (Haldia Institute of Technology, India)and Shreyashi Santra Mitra (Haldia Institute of Technology, India)
DOI: 10.4018/978-1-5225-1814-3.ch007
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Abstract
The study aims to predict landslide hazard zones near Tehri Dam in Uttarakhand State located in the Western Himalayas in India. Four different models were analysed: Weight Factor Model (M1), Multiple Factor Model (M2), Statistical Bivariate model (M3) and Analytical Hierarchical Processes (AHP) model (M4). Five different combination of reference landslides were used for deriving weights of the classes in the factor maps: all the landslides from 1990, 2002 & 2010 (C1); landslides from 2010 (C2); landslides from 1990 & 2002 (C3); landslides located within 500m from roads (C4); landslides located beyond 500m from roads (C5). The accuracy resulted from each model in each combination was [Mn:C1, C2…Cn]: M1: 60,44,46,38,66%; M2:70,76,79,73,71%; M3:45,37,23,36,85%; M4:64,51,51,64,36%. Multiple Factor Model (M2) resulted in a consistently high accuracy in all the combinations. Finally, the 20 different model outputs were integrated to derive unified hazard zonation maps based on: (a) mean (85% accuracy), (b) penalisation (57% accuracy) and (c) k-means cluster (80% accuracy) approaches.
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