Debris flow and landslide hazard mapping and risk analysis in China

Abstract

This paper assesses the hazardousness, vulnerability and risk of debris flow and landslide in China and compiles maps with a scale of 1∶6000000, based on Geographical Information System (GIS) technology, hazard regionalization map, socioeconomic data from 2000. Integrated hazardousness of debris flow and landslide is equivalent to the sum of debris flow hazardousness and landslide hazardousness. Vulnerability is assessed by employing a simplified assessment model. Risk is calculated by the following formula: Risk= Hazardousness × Vulnerability. The analysis results of assessment of hazardousness, vulnerability and risk show that there are extremely high risk regions of 104 km², high risk regions of 283008 km², moderate risk regions of 3161815 km², low risk regions of 3299604 km², and extremely low risk regions of 2681709 km². Exploitation activities should be prohibited in extremely high risk and high risk regions and restricted in moderate risk regions. The present study on risk analysis of debris flow and landslide not only sheds new light on the future work in this direction but also provides a scientific basis for disaster prevention and mitigation policy making.

Keywords

debris flow and landslide hazards / hazardousness / vulnerability / risk assessment and analysis / GIS mapping

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Acknowledgements

This research work was financially supported by the National Key Technology Research and Development Project (No. 2006BAD20B03).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg