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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/nhess-2018-147
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2018-147
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 Jul 2018

Research article | 23 Jul 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Debris Flow Risk Mapping Based on GIS and Extenics

Wenbo Xu1,2, Xueru Zhang1,2, Yangjuan Zou1,2, Chunyu Zhang1,2, and Siyu Liu1,2 Wenbo Xu et al.
  • 1Center for Information Geoscience, University of Electronic Science and Technology of China
  • 2School of Resources and Environment, University of Electronic Science and Technology of China

Abstract. Debris flow, a very dangerous natural disaster, frequently occurs in mountainous areas of Sichuan province. China. Here, we applied the extenics method, which is normally used in single debris flow risk assessment, towards a large-scale debris flow risk assessment for the first time, and built the classical matter elements and joint domain matter elements for assessment of the debris flow risks in Sichuan province. Eight factors, including relative elevation, slope, rock hardness, rainfall, gully density, vegetation coverage, occurrences of historical debris flow and historical earthquake occurrences were selected for debris flow assessment by using geographic information system technology and weight analysis approach. Based on the risk assessment, the debris flow risk map was generated. Results indicate that areas with high risk and very high risk accounted for 21.32% and 14.35% of the whole province, respectively. 76% of the verification points fall within the moderate, high and very high risk areas, suggesting high accuracy of extenics method in large-scale assessment areas. Thus, the Geographic Information System (GIS) and extenics based methods could provide a strong support for debris flow management in the region.

Wenbo Xu et al.
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Wenbo Xu et al.
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Short summary
Debris flow, a very dangerous natural disaster. There is no effective method to assessment the lager-scale debris flow. We applied the extenics method towards a large-scale debris flow risk assessment for the first time, built the classical matter elements and joint domain matter elements for assessment of the debris flow risks. The results show that model has a high coincidence with the number of historical debris flow,suggesting high accuracy of extenics method in large-scale assessment areas.
Debris flow, a very dangerous natural disaster. There is no effective method to assessment the...
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