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Evidence-Based Landslide Hazard Assessment in Loboc Watershed, Bohol, Philippines

  • Tomas Diño ReyesJr.
  • James Caldwell Bethune
Conference paper

Abstract

The study investigated the utility of updating a landslide hazard model with actual surveyed landslide locations in the Loboc Watershed of Bohol, Philippines. Landslide-prone areas were identified using an overlay and index-based approach with five slope instability parameters, including slope, soil morphology, geology, precipitation, and land cover, based on the approach described in the Philippine Vulnerability Assessment Manual. Five models, each with different parameter weights, were evaluated, and then their results were compared to a database of recent landslide locations. Models with heavy slope weightings most accurately predicted landslide locations, indicating that in the Loboc Watershed, slope is the most important parameter considered. The best-fitting model was then used to map the distribution of landslide hazard in the watershed. The results show that 9493.13 ha (14.55%) of the total land area of the watershed had high to very high landslide hazard susceptibility, concentrated in the mountainous municipalities of Bilar, Carmen, Loboc, Sevilla, and Balilihan.

Keywords

Landslide Loboc Watershed Hazard GIS Spatial analysis 

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Tomas Diño ReyesJr.
    • 1
  • James Caldwell Bethune
    • 1
  1. 1.Bohol Island State UniversityTagbilaranPhilippines

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