城市供水管道失效后果评价模型

为评价城市供水管道发生事故关阀后管网的运行状态,建立了供水管道失效后果评价模型.该模型为二级评价模型,以影响区流量减少情况、非影响区流量减少情况及压力降低情况为3个评价指标;评价模型中所有变量都是节点的属性值,从而易于借助水力模型取值;供水管道失效后果评价模型基于供水管道失效水力模型构建,该水力模型综合运用节点流量初次重分配、节点流量压力驱动自适应调整的方法,并以遗传算法求解.将模型在算例管网中模拟实验,模型应用效果良好,并且根据模型模拟结果,能有效分析管网中阀门布置的合理性及管道担负的角色,可有针对性地提出降低管道失效后果的措施.

The failure consequence evaluation model of urban water supply pipeline

To evaluate the working state after turning off some valves in an urban water distribution system(WDS) when there was a pipeline breakage,this paper established a failure consequence evaluation model,in which the node demands decrease of affected pipelines,the node demands decrease and the pressure reduction of non-affected pipelines were taken as three estimate indexes.And because all the variables were the node’s properties,their values were easier to get from the hydraulic model.As a basis for the model,a micro-hydraulic model named water supply pipeline failure hydraulic model was established.It redistributed node demands firstly,and then automatically adjusted the node demands under node pressure,and was calculated by genetic algorithm(GA).By the simulation experiments in a small water distribution system,it showed that the assessment model worked well.According to the results,the reasonableness of the valve’s arrangement and the role of some pipelines in the network can be effectively analyzed.