TITLE:
Risk Assessment of Highway in the Upper Reaches of Minjiang River under the Stress of Debris Flow
AUTHORS:
Mingyang Li, Shujun Tian, Chen Huang, Wenqia Wu, Shiwu Xin
KEYWORDS:
The Upper Reaches of Minjiang River, Risk Assessment, Highway, Debris Flow
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.9 No.7,
July
16,
2021
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.