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Shallow Landslide Hazard Mapping for Davao Oriental, Philippines, Using a Deterministic GIS Model

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Part of the Advances in Natural and Technological Hazards Research book series (NTHR,volume 45)

Abstract

Davao Oriental located at 7°30′N and 126°50′E is one of the many landslide-prone provinces in the Philippines experiencing severe rainfall throughout the year. With the increase in population and other infrastructural developments, it is necessary to map the landslide potential of the area, to assure the safety of the people and delineate suitable land for development. In order to produce rainfall-induced shallow landslide hazard maps, Stability Index Mapping (SINMAP) was used over a 5-m interferometric synthetic aperture radar (IFSAR)-derived digital terrain model (DTM). SINMAP is based on the infinite slope stability model. Topographic, soil geotechnical, and hydrologic parameters (cohesion, angle of friction, bulk density, infiltration rate, and hydraulic transmissivity) were assigned to each pixel of the DTM with the total area of 5,164.5 km2 to compute for the corresponding factor of safety. The landslide hazard maps generated using SINMAP are found to be accurate when compared to the landslide inventory from 2003 to 2013. The landslide susceptibility classification was translated to zoning maps indicating areas that are safe from shallow landslides, areas that can be built upon with slope intervention and monitoring, and the no-build areas. These maps complement the structurally controlled landslide, debris flow, and other natural hazard maps that are being prepared to aid proper zoning for residential and infrastructural developments.

Keywords

  • Landslide
  • Hazard mapping
  • Deterministic model
  • Philippines
  • Davao Oriental
  • Natural hazards

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Acknowledgments

We would like to thank the creators of SINMAP (Pack et al.) for making this program available to the research and development community and communicating with us in the early stages. We also thank the National Mapping and Resource Information Authority (NAMRIA) for the IFSAR DTM used in this simulation. Funding for the project titled Enhancing Landslide Hazard Maps Through LIDAR and Other High Resolution Imageries is from the Department of Science and Technology (DOST), government of the Philippines .

Other Notes

DOST Project NOAH is a program implemented by the Philippine government to assess the different hazards present in the Philippines . Assessment of flood, landslide, and storm surge hazards is part of the program. Completed maps are to be added to the NOAH website (www.noah.dost.gov.ph) for free access to the general public to aid in the information dissemination to reduce effects of meteorological hazards in the country. The website, in partnership with PAGASA, also displays various weather sensors and visualizations to aid in the understanding of weather data.

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Correspondence to Ian Kaye Alejandrino B.S. .

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Alejandrino, I.K., Lagmay, A.M., Eco, R.N. (2016). Shallow Landslide Hazard Mapping for Davao Oriental, Philippines, Using a Deterministic GIS Model. In: Drake, J., Kontar, Y., Eichelberger, J., Rupp, T., Taylor, K. (eds) Communicating Climate-Change and Natural Hazard Risk and Cultivating Resilience. Advances in Natural and Technological Hazards Research, vol 45. Springer, Cham. https://doi.org/10.1007/978-3-319-20161-0_9

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