Risk Assessment of Debris Flow Based on Rainfall Frequency

doi:10.11988/ckyyb.20160834

JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2018, Vol. 35 ›› Issue (1): 67-72.DOI: 10.11988/ckyyb.20160834

• FLOOD PREVENTION AND DISASTER REDUCTION • Previous Articles Next Articles

Risk Assessment of Debris Flow Based on Rainfall Frequency

WANG Yi^1,2, TANG Chuan², HE Chu³,GONG Ling-feng²

1.Chinese Southwest Architectural Design and Research Institute Co., Ltd., Chengdu 610052, China;
2.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu Universityof Technology, Chengdu 610059, China;
3.College of Earth Sciences, Chengdu Universityof Technology,Chengdu 610059, China

Received:2016-08-22 Online:2018-01-01 Published:2018-01-11

Abstract

Abstract: The risks of debris flow in Wenchuan County, Sichuan Province of China are assessed as a typical case study by a combination of GIS technology and hierarchy-information quantity model. According to the special geological condition after earthquake, six factors affecting the source materials of debris flow are selected (slope gradient, elevation, water system’s influence zone, earthquake intensity, fault’s influence zone, and type of rock soil mass) to analyze the susceptibility of the most important source materials. The susceptibility maps of landslide and debris flow in Wenchuan County are obtained. Furthermore, the risks of debris flows under 100-year rainfall and 50-year rainfall are analyzed respectively. Finally, the risk zoning maps are obtained in ArcGIS, and debris flow canals in need of monitoring and treatment are determined.

Key words: debris flow, rainfall frequency, hierarchy-information quantity model, GIS, risk assessment

CLC Number:

TU452

WANG Yi, TANG Chuan, HE Chu,GONG Ling-feng. Risk Assessment of Debris Flow Based on Rainfall Frequency[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2018, 35(1): 67-72.

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Risk Assessment of Debris Flow Based on Rainfall Frequency

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