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Initial Screening of Regional Landslide Hazards in the Hunza River Watershed, Gilgit Baltistan, Pakistan
Natural Hazards Review
  • M. Farooq Ahmed
  • Maisum Hussain
  • J. David Rogers, Missouri University of Science and Technology
  • Muhammad Saleem Khan
Abstract

Landslides pose a significant hazard to life and property in areas vulnerable to mass movements. Qualitative landslide susceptibility maps offer a preliminary means of screening locations likely susceptible to slope instability. In this study, attempts have been made to identify various landslide hazard zones within the Hunza River watershed (varying from very high to low hazards) by considering geomorphic and geological conditions and employing common trigger factors into GIS data layers. Three different approaches were selected: the weighted overlay, fuzzy logic, and analytical hierarchy processes. These approaches allowed the compilation of preliminary landslide hazard maps for the 8,000 km2 Hunza River watershed area. This study utilizes the information layers related to geomorphological and geological risk factors such as elevation, slope angle, slope aspect, curvature, the normalized difference vegetation index (NDVI), lithology, distance to major faults, and drainage. Assumed triggering factors included seismic excitation and precipitation, expressed in raster files. These thematic map overlays were employed as input layers to compile landslide hazard maps. Each of the methods used to construct hazard maps produced satisfactory results when compared with existing landslide inventories, even those accompanied by field validation surveys. For the very high hazard zones in Chalt and the upper Hunza Valley, the trigger variable appears to be the Main Karakorum Thrust (MKT), where shattered lithologic units are most susceptible to landslides. These comparisons suggest that majority of documented rockslides fall in high and very hazard zones in the Hunza River watershed. Our findings also suggest that the employment of off-the-shelf GIS software may become a cost-effective means of assembling similar hazard maps on a regional scale elsewhere.

Department(s)
Geosciences and Geological and Petroleum Engineering
Comments

This research work was funded by the Higher Education Commission (HEC), Pakistan under the National Research Program for Universities (NRPU Project ID 9538).

Keywords and Phrases
  • GIS,
  • Hunza river,
  • Landslide,
  • Susceptibility,
  • Watershed
Geographic Coverage
Pakistan
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2021 American Society of Civil Engineers (ASCE), All rights reserved.
Publication Date
11-1-2021
Publication Date
01 Nov 2021
Citation Information
M. Farooq Ahmed, Maisum Hussain, J. David Rogers and Muhammad Saleem Khan. "Initial Screening of Regional Landslide Hazards in the Hunza River Watershed, Gilgit Baltistan, Pakistan" Natural Hazards Review Vol. 22 Iss. 4 (2021) ISSN: 1527-6996; 1527-6988
Available at: http://works.bepress.com/j-rogers/99/