摘要
供水管网的夜间最小流量(MNF)在漏损程度评估中起到重要作用,其数值大小对评估准确度有很大影响.以广东省某市供水管网为例开展夜间最小流量监测实验,研究取值时间固定与否、匹配时间区段、取值时间间隔对夜间最小流量数值的影响,并据此探讨了更加合理的夜间最小流量确定方法.研究结果显示,夜间最小流量较夜间最小流量时刻流量(MNFTF)能取到更小数值,约偏低 5.18%;匹配时间区段不局限在 02:00-04:00;取值时间间隔为 10、15、20、30、60、90、120 min时,较5 min时夜间最小流量分别平均高 15.70%、22.95%、27.81%、33.00%、42.08%、49.39%、60.34%.这表明为了得到更小的夜间最小流量,其取值方法存在较大的优化空间,在我国夜间最小流量建议匹配时间区段放宽到 00:00-06:00,取值时间间隔要尽可能短,优先考虑不固定取值时间的方法.
Abstract
The minimum night flow(MNF)in the water supply network plays an important role in evaluating the degree of leakage,and its numerical value has a significant impact on the accuracy of the evaluation.This article conducted a minimum night flow monitoring experiment on the water supply network in a certain city,Guangdong Province,to study the influence of fixed value time,matching time period,and value interval on the minimum night flow value.Based on this,we explored a more reasonable method for determining the minimum night flow.The research results showed that the minimum night flow was smaller than the minimum nighttime flow time flow(MNFTF),which was about 5.18%lower;The matching time range was not limited to 02:00 am to 04:00 am;When the value intervals were 10,15,20,30,60,90,120 min,the MNF values were 15.7%,22.95%,27.81%,33.00%,42.08%,49.39%,and 60.34%higher than those of 5 min,respectively.This indicated that there was significant room for optimization in the method of obtaining a smaller minimum night flow.In China,it was recommended to relax the matching time range to 00:00 am to 06:00 am for the minimum night flow,shorten the value interval as much as possible,and prioritize methods with variable value times.
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