Abstract
The southwest mountainous area is a frequent debris flow disaster area in China, which poses a serious threat to the regional roads and greatly affects the normal traffic operation and the safety of residents’ lives and property. The debris flow risk assessment of highway can quantify the threat degree of debris flow to the roads. In this paper, from the perspective of villages and towns, taking the upper reaches of Minjiang River as the research area, four factors including road network density, highway disaster resistance capacity, population density and highway cost are selected, and the weight is obtained by using entropy weight method, and the debris flow vulnerability evaluation results of highway are obtained by weighted calculation. Four indexes of debris flow density, shape factor, relative height difference and annual rainfall are selected to evaluate the debris flow hazard of highway by using the information method. Based on the vulnerability and hazard evaluation results, the risk of highway debris flow is evaluated, and the results are classified and discussed. The results show that: the risk of debris flow on the upper reaches of Minjiang River is relatively low, the overall spatial distribution shows a trend of high in the East and low in the west, and the overall risk of township roads in Wenchuan county is the highest; The risk of debris flow is generally high within -10 to 30 km from the central fault zone of Longmenshan.
Highlights
The results show that: the risk of debris flow on the upper reaches of Minjiang River is relatively low, the overall spatial distribution shows a trend of high in the East and low in the west, and the overall risk of township roads in Wenchuan county is the highest; The risk of debris flow is generally high within −10 to 30 km from the central fault zone of Longmenshan
81 villages and towns in the upper reaches of Minjiang River are taken as the evaluation unit, and the vulnerability of highway under debris flow stress is evaluated from the perspectives of society, economy and highway itself; Based on 1800 Small Watersheds in the upper reaches of Minjiang River, the risk of highway in the upper reaches of Minjiang River under the stress of debris flow was evaluated by using information method; according to the vulnerability and risk assessment results of highway debris flow, the highway risk in the upper reaches of Minjiang River under the stress of debris flow is quantified, which provides scientific guidance and reference for highway planning and construction and disaster prevention and mitigation management in southwest mountainous areas
It can be seen that the spatial distribution of debris flow vulnerability of highway in the upper reaches of Minjiang River presents a trend of low in the West and high in the East; 48 towns are in low vulnerability level and below, accounting for 59% of the total number of towns in the study area, of which the overall vulnerability level of Heishui county highway is the lowest; The towns with moderate vulnerability level and above are located along the Duwen high speed, G213, G317 and S302; The three towns with high vulnerability level are located in Wenchuan County, respectively Weizhou Town, Miansi Town and Yinxing Town
Summary
81 villages and towns in the upper reaches of Minjiang River are taken as the evaluation unit, and the vulnerability of highway under debris flow stress is evaluated from the perspectives of society, economy and highway itself; Based on 1800 Small Watersheds in the upper reaches of Minjiang River, the risk of highway in the upper reaches of Minjiang River under the stress of debris flow was evaluated by using information method; according to the vulnerability and risk assessment results of highway debris flow, the highway risk in the upper reaches of Minjiang River under the stress of debris flow is quantified, which provides scientific guidance and reference for highway planning and construction and disaster prevention and mitigation management in southwest mountainous areas. It is conducive to promoting regional social and economic development, and has important scientific significance for the development of highway disaster prevention and control research and other related fields
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