双水位尺渠道测流

Flow Measurement by “dual Gage”in Canal

一般而言,从20世纪50年代起至今,采用设于斗渠进口的“单水位尺”法测(定)流(量),然而,经验表明,上述“单水位尺”的测流成果往往不够准确。因此,山西滹沱河灌区最近几年一直在试验“双水位尺”法,“双水位尺”法非常简单,只是在斗渠进口处的原有水尺的下游约100m处,建立另外一支水尺,应注意两只水尺,老的和新的必须确切地建立成同一的水位零点高程。测流时,只同时记录两只水尺的水位,就可获得具有高精度的渠道流量。此外,利用“双水位尺”法还可以大致确定与水有关的事故位置。

In the general ,from the 1050's ,a 'single gage'method for flow measurement at the inlet of tertiary canal had been used .Howrver ,the experience shows that the measuring result of the 'single gage method 'mentioned above is often lacking in accuracy .Therefore ,Hutuohe irrigation distriet ,ShanXi ,has been testing a 'dual gage'method for last several years .The 'dual gage 'method is very simple that only another gage is erected about 100meters downstream of the original gage at the inlet of the tariary canal .Take care that the gages ,old and new ,must be erected exactly on the Same elevation of gage zero .when mwasuring flow ,only by recording thw fwo gage's water level at the same time ,the canal discharge that is of high accuracy will be obtarned .And further ,the location of accident that is related to water will also be able to roughly be determined by using the 'dual gage 'mwthod .