Landslide Hazard Zonation using Remote Sensing and GIS: a case study of Dikrong river basin, Arunachal Pradesh, India |
| |
| Authors: | Ashish Pandey P P Dabral V M Chowdary N K Yadav |
| |
| Institution: | (1) Water Resource Development and Management Department, IIT, 247 667 Roorkee, India;(2) Agricultural Engineering Department, NERIST, Nirjuli, Itanagar, Arunachal Pradesh, 791 109, India;(3) CSEAS, Kyoto University, Kyoto, Japan |
| |
| Abstract: | Landslides are among the most costly and damaging natural hazards in mountainous regions, triggered mainly under the influence
of earthquakes and/or rainfall. In the present study, Landslide Hazard Zonation (LHZ) of Dikrong river basin of Arunachal
Pradesh was carried out using Remote Sensing and Geographic Information System (GIS). Various thematic layers namely slope,
photo-lineament buffer, thrust buffer, relative relief map, geology and land use / land cover map were generated using remote
sensing data and GIS. The weighting-rating system based on the relative importance of various causative factors as derived
from remotely sensed data and other thematic maps were used for the LHZ. The different classes of thematic layers were assigned
the corresponding rating value as attribute information in the GIS and an “attribute map” was generated for each data layer.
Each class within a thematic layer was assigned an ordinal rating from 0 to 9. Summation of these attribute maps were then
multiplied by the corresponding weights to yield the Landslide Hazard Index (LHI) for each cell. Using trial and error method
the weight-rating values have been re-adjusted. The LHI threshold values used were: 142, 165, 189 and 216. A LHZ map was prepared
showing the five zones, namely “very low hazard”, “low hazard”, “moderate hazard”, “high hazard” and “very high hazard” by
using the “slicing” operation. |
| |
| Keywords: | GIS Landslide Relief Remote sensing Slope |
| 本文献已被 SpringerLink 等数据库收录！ |
|
