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[1]YANG Cheng-lin,CHEN Ning-sheng,DENG Ming-feng.Assessment on Debris-flow Hazard Based on the Volume of Debris -A Case Study in the Baishahe River, Dujiangyan[J].Research of Soil and Water Conservation,2011,18(06):25-30.

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Assessment on Debris-flow Hazard Based on the Volume of Debris -A Case Study in the Baishahe River, Dujiangyan

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 18 Number of periods: 2011 06 Page number: 25-30 Column: Public date: 2011-12-20

Title:: Assessment on Debris-flow Hazard Based on the Volume of Debris -A Case Study in the Baishahe River, Dujiangyan

Author(s):: YANG Cheng-lin^1,2, CHEN Ning-sheng¹, DENG Ming-feng^1,2; 1. Key Lab of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: Baishahe River; debris flows; formation condition; volume of debris

CLC:: P642.23

DOI:: -

Abstract:: Abundant debris deriving from the landslides and rock avalanches triggered by large earthquakes could significantly alter the characteristics and occurrence frequency of debris flows in the earthquake stricken areas. There is an urgent need for a quick and easy method to assess debris flow hazard to aid the recovery activities by the local residents. Conventional methods are mainly based on field investigations which are time consuming and resources demanding. In addition, as the loose materials are gradually taken away by debris flows, the debris flow occurrence frequency will change with time and more regular updates are needed with the debris flow hazard maps. Therefore, a GIS based system using satellite remote sensing and digital elevation model is proposed in this study. The debris-flow potential index based on the volume of unstable debris is used as the assessment criterion. The proposed method is applied to a case study in the river area affected by the Wenchuan Earthquake 2008. It has been found that the resulted hazard map corresponded well with the observed debris hazards. The validity of the proposed method is depended on the digital data and need regularly update from the latest satellite images with more up-to-date debris accumulation information.

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