Quantitative Evaluation Method Of Urban Traffic Road Networks Resilience To Waterlogging Disasters

The urban traffic road network plays an important role in the normal operation of the city,but the urban flood and waterlogging disaster has a huge negative impact on the urban traffic road network.In the daily operation of cities or during a disasters,the government both attaches great importance to the function of the urban traffic road network,but there is still a lack of understanding urban traffic road network’s resilience to waterlogging.Traditional waterlogging measures and concepts have been difficult to adapt to the needs of urban modernization and development.It is urgent to introduce the concept of waterlogging resilience into the urban traffic road network,and it is necessary to conduct a quantitative evaluation study on the waterlogging resilience of the urban traffic road network to improve the urban traffic road network waterlogging resilience.The specific research is conducted as the following steps:(1)The research background,current status at home and abroad are sorted out.It is found that the domestic and foreign researches on the urban traffic road network’s resilience to waterlogging lack focus,failing to fully analyze its influencing factors and improvement suggestions.It is also found that current researches lack the use of technical means such as rain flood simulation software.This study is conducted to make up for these deficiencies.(2)The concept and connotation of the urban traffic road network’s waterlogging resilience are analyzed.The concepts and connotations of urban traffic road networks,flood disasters,and urban traffic road network resilience are clarified,and the urban traffic road network’s waterlogging resilience is defined as the ability to respond to and recover from flood disasters.(3)An evaluation index system for urban traffic road network’s waterlogging resilience is established.After analyzing and comparing the quantitative evaluation methods of infrastructure resilience,the theory of 4R characteristics is selected,which focuses on the robustness,rapidity,strategy and redundancy of waterlogging.Through relevant literature,interview materials,news reports and regulatory plans,an evaluation index system for the anti-waterlogging resilience of urban traffic road networks is constructed.Experts are invited to conduct a second screening,and an evaluation index system containing 26 indexes is determined.(4)An evaluation model of the urban traffic road network’s waterlogging resilience is established.After corresponding the waterlogging robustness and rapidity indicators to the SWMM model parameters and output,the data features of each characteristic are clarified.A quantitative model of waterlogging robustness and rapidity based on the entropy weight method,a model of resourcefulness and redundancy based on G1 method and a comprehensive evaluation model are established.(5)The SWMM model is used to quantify the traffic road network’s waterlogging resilience of Jiangbei New District,Nanjing.Taking Jiangbei New District in Nanjing as an example,a simulation model of road network flood resilience in Jiangbei New District is constructed.Based on the SWMM model output results,the entropy weight method is used to perform robustness and rapidity quantitative evaluation,and the G1 method is used to perform resourcefulness and redundancy quantitative evaluation.Then a comprehensive evaluation is conducted.In the case of a five-point system,the comprehensive score of the study area is 3.55 before the transformation and3.96 after the transformation.Based on the evaluation results,the Jiangbei New District of Nanjing City was given targeted recommendations for improvement.(6)The universal recommendations are summarized.The experience of the traffic road network’s waterlogging resilience in typical developed countries is analyzed and the management systems are compared.Combining the international rain and flood related policies,the Singapore ABC certification system,the construction of the road network’s resilience of Singapore and the results of case study,suggestions are made for the daily improvement and disaster improvement of the road network’s waterlogging resilience.Studying the conceptual connotation and evaluation methods of the urban traffic road network’s waterlogging resilience is of great significance for improving the urban traffic road network’s waterlogging resilience,and can effectively make up for the limitations of existing theories and practices.