基于分区计量系统的供水管网模型流量分配方法研究

Research on Flow Distribution Model of Water Supply Network Based on District Metering System

节点流量作为供水管网建模的重要参数,其分配结果直接影响供水模型准确性。针对目前常规节点流量分配方法准确性不足及工作强度大的问题,提出了基于分区计量系统的供水管网节点流量分配方法。该分配方法中的节点流量是居民用户节点流量、其他工商户节点流量和产销差节点流量之和。居民节点流量通过DMA边界五级表数据确定;其他工商户节点流量通过终端六级远传表数据确定;产销差节点流量,以二级分区为单位,在区域内沿线流量均分后折算。该方法运用于H市供水管网水力建模项目,模型校核结果:测压点水压的实测记录值与模拟值之差分别为100%≤(±4)mH_2O;85.83%≤(±2)mH_2O;55.18%≤(±1)mH_2O;23.15%≤(±0.5)mH_2O,提高了模型精度。

As an important parameter of water supply network modeling,node flow directly affects the accuracy of water supply model.Aiming at insufficient accuracy and high work intensity of the current node-flow distribution methods,this paper proposes a node flow distribution method of water supply network based on district metering system,whose node flow is the sum of residential user node flow,industrial and commercial user node flow and the no-revenue water node flow.The node flow of residential users is obtained from the five-level water meter at the DMA boundary;the node flow of industrial and commercial users is obtained from the six-level terminal water meter;the no-revenue water node flow is converted from the equal divison of flow along the line in each secondary area.This method is applied to the hydraulic modeling project of water supply network in H city,and the verification results are as follows:the differences between the measured value and the simulated value of water pressure at the measuring point are 100%≤(±4)mH2O,85.83%≤(±2)mH2O,55.18%≤(±1)mH2O,23.15%≤(±0.5m)H2O,respectively,indicating that this method improves the accuracy of the model.