• 山洪/泥石流灾害风险评价 •

### 四川省小流域泥石流危险性评价

1. 1. 西南石油大学土木工程与建筑学院,成都 610500
2. 中国科学院重庆绿色智能技术研究院,重庆 400714
3. 中国科学院地理科学与资源研究所 资源与环境信息系统国家重点实验室,北京 100101
• 收稿日期:2017-06-30 修回日期:2017-09-26 出版日期:2017-12-25 发布日期:2017-12-25
• 作者简介:

作者简介：熊俊楠(1981-),男,四川南充人,博士,副教授,主要从事地理信息系统与灾害风险分析方面的研究。E-mail: neu_xjn@163.com

• 基金资助:
住房和城乡建设部科技计划项目（2016-K3-024）;国家安全生产监督管理总局科技项目（2014-3281）;西藏自治区科技支撑计划项目(省809);西南石油大学启航计划项目（2014QHZ034）

### Hazard Assessment of Debris Flow in Sichuan Province

XIONG Junnan1,3,*(), WEI Fangqiang2, LIU Zhiqi1

1. 1. School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China
2. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
3. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Acdemy of Sciences, Beijing 100101, China
• Received:2017-06-30 Revised:2017-09-26 Online:2017-12-25 Published:2017-12-25
• Contact: XIONG Junnan E-mail:neu_xjn@163.com

Abstract:

Hazard assessment is important for the prevention and mitigation of debris flow disaster. This study takes Sichuan Province as the research area. Based on the DEM data, we realize the demarcation of the small watershed in Sichuan Province by extracting the direction of water flow and calculating the accumulation of the flow confluence. Based on the collected information of debris flow watershed, we selected the watershed elevation difference and watershed area as the indicators. The identification model of potential debris flow watershed based on the energy condition was built by analyzing the hazard-formative environment and characteristics of debris flow hazards. A total of 7798 small watersheds with the required energy conditions for debris flow occurring were identified by utilizing the established model among all the demarcated small watersheds, which is 31.1×104 km2 accounting for 64.18% of the total area of Sichuan Province. The indicator system of debris flow hazard risk assessment and the extension matter-element model were established from the energy condition of the debris flow occurring, the condition of the loose solid materials, the precipitation condition and the condition of human activity. These determine the weights of the assessment factors, of dividing the grade of the hazard risk, by which it classifies the hazard risk degree of small watershed debris flow. The number of the moderate, high and very high hazard degree is 1946, 1725 and 1002, with an area of 9.1×104 km2, 7.7×104 km2 and 3.4×104 km2, respectively. The total area of moderate hazard areas is 20.2×104 km2, accounting for 41.67% of the total area of Sichuan Province. Finally, the analyses were made for the reliability of assessment results and the distribution of the different hazard degree of debris flow areas in different municipal administrative districts and the major river valleys. All the known small watershed of very high hazard degree are identified as debris flow watersheds. The 896 watersheds of moderate hazard degree do not belong to the identified debris flow and 1233 watersheds of high hazard degree do not belong to the identified debris flow, either. They are the key area for disaster prevention and reduction in Sichuan province in the next few years. The results of the analyses have the great theoretical and practical significance for enhancing the debris flow identification, the prevention and mitigation of regional debris flow disaster. The sustainable development of mountainous areas and also the theory of the risk assessment of debris flow hazard.