Study On Resilience Evaluation Of Water Distribution Network Based On Optimal Arrangement Of Valves

As the lifeline project of the city,the water distribution network undertakes the important task of maintaining the water needed for the life and production of the whole city.However,with the corrosion and aging of the pipeline and the influence of earthquakes and other disasters,the pipeline inevitably bursts and fails,resulting in the interruption of water supply.Improving the resilience of water distribution network is helpful to reduce the vulnerability of water distribution network in disaster and quickly return to normal state,thus reducing the impact of disaster.However,there is still no accepted definition of resilience,which makes the evaluation methods of resilience different,and it is impossible to establish a comprehensive research system of water distribution network resilience.On the basis of previous studies,starting from the network system,this paper gives full consideration to various uncertainties of damage and post-disaster recovery,and puts forward the resilience evaluation method and resilience promotion strategy of water distribution network.The main work is as follows:.(1)Based on the research status of historical resilience at home and abroad,the definition and evaluation methods of water distribution network resilience are systematically put forward,the existing stages and properties of system resilience are deeply analyzed,three evaluation methods of resilience are comprehensively analyzed,their advantages and disadvantages are summarized,the diversified indexes of resilience are introduced in detail,and the evaluation methods of resilience in this paper are put forward.(2)Taking the resilience evaluation index system as the framework,based on the resilience platform of water distribution network,the modeling method of water distribution network resilience is analyzed,and WNTR is analyzed.The network structure,hydraulic simulation,disaster simulation and response,and resilience index are integrated into a framework,and the simulation analysis flow adopted in this study is put forward.(3)Using graph search method,the identification method of valve isolation segment is proposed.Based on the principle of valve layout,the system resilience under different valve densities is compared and analyzed,and according to the visualization of valve isolation segment diagram,the method of optimizing valve distribution by using valve isolation segment diagram is put forward.(4)Based on the optimized valve isolation segment model,the seismic attenuation model method is used to simulate the damage,and the segment analysis is applied to the connectivity analysis.Four connectivity indexes are adopted to compare and analyze the pipeline damage state and connectivity of water distribution network under the conditions of single pipe isolation and segment isolation.(5)Based on the regional analysis method,the isolated segment instead of a single pipeline is taken as the research object,and the regional resilience performance of the pipe network is analyzed,and the resilience grade of each segment is divided.The three elements of resilience improvement recovery time,maintenance sequence and important segment protection are pointed out,and some suggestions for resilience improvement strategy are given.