Preprints
https://doi.org/10.5194/nhess-2018-147
https://doi.org/10.5194/nhess-2018-147
23 Jul 2018
 | 23 Jul 2018
Status: this preprint has been withdrawn by the authors.

Debris Flow Risk Mapping Based on GIS and Extenics

Wenbo Xu, Xueru Zhang, Yangjuan Zou, Chunyu Zhang, and Siyu Liu

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.

This preprint has been withdrawn.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Wenbo Xu, Xueru Zhang, Yangjuan Zou, Chunyu Zhang, and Siyu Liu

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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Wenbo Xu, Xueru Zhang, Yangjuan Zou, Chunyu Zhang, and Siyu Liu
Wenbo Xu, Xueru Zhang, Yangjuan Zou, Chunyu Zhang, and Siyu Liu

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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.
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