A road network resilience assessment in high disaster risk areas: The case study of aba tibetan and qiang autonomous prefecture

In geographically vulnerable areas, road networks are costly and dangerous to build, and difficult to repair. A stable transportation system can bring about stable regional economic development. Based on the theory of road network resilience assessment, we combine the multi-hazard characteristics of disaster-prone regions, scientifically construct a quantitative index system for assessing strike intensity and quantify network functions using the Hansen index, thus forming a network resilience assessment method for disaster-prone regions. Aba Tibetan and Qiang Autonomous Prefecture is selected as the study area. The differences and impacts of single and double disconnections are assessed and discussed on the basis of population and region. The resilience assessment results are compared with the road network importance, average time change and road network degree distribution, and the results of the study find that: (1) When single disconnections are made, the road network resilience in the southeast region of Aba is lower due to the influence of road network importance and strike intensity. (2) Compared with the other three assessment methods, the resilience has better differentiation for road network and is more consistent with regional characteristics. (3) When we simulate a multi-point disaster, most of the roads in the road network perform well, but some of them have bad conditions such as impassability and sharp increase in impact due to coupling effects. The method described in this paper can provide a good theoretical basis for further prediction of traffic disaster, supporting local authorities in disaster prevention decisions and reducing disaster losses.