中国地质大学(武汉)信息工程学院，武汉 430074,中国地质大学(武汉)信息工程学院，武汉 430074,立得空间信息技术股份有限公司，武汉 430223
为了精细刻画供水管网在事故状态下的可靠性，提出一种新的供水管网分析模型——考虑流向的单元阀门图（segmentvalve diagram with flow directions, SVFD）.该模型将供水管网阀门拓扑模型改造为有向图，用有向边标记阀门处的水流方向，能够更加精准地描述爆管时需要关闭的阀门，并有利于获取真实完整的停水区域.运用该模型进行供水管网拓扑可靠性评价，面向事故影响、隔离难度和应急时间，设计了5个新的评价指标.使用这些指标对中国3个城市的供水管网进行可靠性分析，结果显示，与基于单元阀门图的传统经典指标相比较，改进指标能更加准确清晰地反映管网事故的实际影响和处置难度.
A novel water distribution network (WDN) analysis model, segmentvalve diagram with flow directions (SVFD), is proposed to elaborate the reliability of WDNs in case of accident. By transforming a WDN valve topology model into a directed graph and marking directions of water flowing through valves with directed edges, this model can more accurately determine the valves to be closed when a pipe burst occurs, and is conducive to obtaining the really complete outage area. This paper takes advantage of SVFD to evaluate topological reliability of WDNs, and designs 5 new evaluation indicators oriented to accident impact, isolation difficulty and emergency disposal time. Reliability analysis of WDNs in 3 Chinese cities is conducted with these indicators, which shows that compared with the traditional classic indicators based on the segmentvalve diagram, the improved indicators can reflect the actual impact and disposing difficulty of pipe network accidents more accurately and clearly.