基于管段重要性的给水管网布局分析

Water Distribution Systems Layout Analysis Based on Link Importance Indicator

针对给水管网模型中管段重要性判断的实际需求,利用算例,构造了树状管网、不同环数的环状管网、供水压力变化、连通管段直径变化以及多水源供水等情况下的各种给水管网布局,结合水力计算进行了分析,得出了有助于供水管网规划、设计和运行管理中与管段重要性相关的结论:树状管网从水源到每一需水节点仅存在一条输水路径,不存在连通性冗余和能力冗余;环状管网具有连通性冗余,但能力冗余取决于整体布局;环状管网基环数目依次增多时,存在连通管段的局部效应,即在所添加连通管道附近的管段重要性受到影响,但远离小环部分的管段重要性未受影响;随着供水压力的升高和水源的增多,成环部分各管段重要性下降,管网的能力冗余提高.

The concept of link importance was introduced to quantitatively measure the relative value of a link in the water distribution system model. Based on a case study, different pipe configurations such as branched, looped, mixed and dual- source network were constructed. The link importance values are calculated and a comparison is made between the configurations with hydraulic analysis. Some views contributing to the impact of water network layouts on link importance were concluded. Branched network has no redundant connectivity because there is only one flow route from source to a consumer. Looped network contains redundant flow paths, however, the capacity of water supply depends on the overall configuration. Local effects are affected with increasing number of primary loop. The pipe near the connected pipe is affected significantly, while the pipe far from the connected pipe remains unaffected. The link importance of each pipe in loop descends as water supply pressure rises.