IRS-LISS-III and PAN data analysis for landslide susceptibility mapping using heuristic approach in active tectonic regi
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J. Indian Soc. Remote Sens. (September 2009) 37:493–509
RESEARCH ARTICLE
IRS-LISS-III and PAN Data Analysis for Landslide Susceptibility Mapping using Heuristic Approach in Active Tectonic Region of Himalaya M.A.A. Patwary . P.K. Champati ray . Irshad Parvaiz
Received: 10 October 2007 / Accepted: 15 June 2009
Keywords Landslide susceptibility . Remote sensing . GIS . Himalaya
Abstract Structurally disturbed zones of Himalaya are among the worst landslide affected regions in the world. Although landslides are induced/ triggered either by torrential rain during monsoon or by seismic activity in the region, the inherent terrain conditions characterize the prevailing basic conditions susceptible to landslides. Using remotely sensed data and Geographic Information System (GIS), geological and terrain factors can be integrated
M.A.A. Patwary1 . P.K. Champati ray2 ( ) . I. Parvaiz2 1 Geological Survey of Bangladesh, 153, Pioneer Road, Segunbagicha, Dhaka – 1000, Bangladesh 2 Indian Institute of Remote Sensing, 4, Kalidas Road, Dehradun – 248001, India
email : [email protected]
for preparation of factor maps and demarcation of areas susceptible to landslides. Moderate to high resolution data products available from Indian Remote Sensing satellites have been utilized for deriving geological and terrain factor maps, which were integrated using knowledge driven heuristic approach in Integrated Land and Water Information System (ILWIS) GIS. The resultant map shows division of the area into landslide susceptibility classes ranked in terms of hazard potential in one of the structurally disturbed zones in western Himalaya around Rishikesh.
Introduction Landslides are one of the most hazardous geological phenomena in the Himalayan region where downward slope movements occur in a variety of geological materials such as soil, rock, or
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combinations of the two under different environmental conditions. Some slides involve only a small amount of loose surface material, while others result from deep failure of large solid rock masses (Valdiya, 1998; Bist and Sah, 1998; Sarkar et al., 2004; Gupta and Bist, 2004). Different types of movement such as planar, wedge and circular failures occur on gradual as well as on steep slopes under diverse climatic conditions causing flowage, sliding, failing and subsidence (Keller, 1979). This phenomenon is often triggered by torrential rainfall or by seismic activities in the region. Recent developmental activities such as widening of roads by rock blasting have also contributed to the triggering of landslides in many parts of the Himalaya. Geology and geomorphology are the main parameters that influence the occurrence of landslides, followed by other parameters such as the slope gradient, direction of slope, drainage net work, alignment of road network and vegetation density (Crozier, 1986; Virdi et al., 1997; Miller and Sias, 1998). In the present case, an attempt has been made to prepare thematic layers from remotely sensed data using image characteristics such as tone, textur
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