Landslide inventory and susceptibility modelling using geospatial tools, in Hunza-Nagar valley, northern Pakistan

Alam Sher Bacha (Corresponding Author), Muhammad Shafique, H.M.A. van der Werff

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

A comprehensive landslide inventory and susceptibility maps are prerequisite for developing and implementing landslide mitigation strategies. Landslide susceptibility maps for the landslides prone regions in northern Pakistan are rarely available. The Hunza-Nagar valley in northern Pakistan is known for its frequent and devastating landslides. In this paper, we have developed a landslide inventory map for Hunza-Nagar valley by using the visual interpretation of the SPOT-5 satellite imagery and mapped a total of 172 landslides. The landslide inventory was subsequently divided into modelling and validation data sets. For the development of landslide susceptibility map seven discrete landslide causative factors were correlated with the landslide inventory map using weight of evidence and frequency ratio statistical models. Four different models of conditional independence were used for the selection of landslide causative factors. The produced landslides susceptibility maps were validated by the success rate and area under curves criteria. The prediction power of the models was also validated with the prediction rate curve. The validation results shows that the success rate curves of the weight of evidence and the frequency models are 82% and 79%, respectively. The prediction accuracy results obtained from this study are 84% for weight of evidence model and 80% for the frequency ratio model. Finally, the landslide susceptibility index maps were classified into five different varying susceptibility zones. The validation and prediction result indicates that the weight of evidence and frequency ratio model are reliable to produce an accurate landslide susceptibility map, which may be helpful for landslides management strategies.
Original languageEnglish
Pages (from-to)1354-1370
Number of pages17
JournalJournal of mountain science
Volume15
Issue number6
Early online date3 May 2018
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Landslides
  • Northern Pakistan
  • Susceptibility assessment
  • Inventory map
  • ITC-ISI-JOURNAL-ARTICLE
  • UT-Hybrid-D

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