二线能坡测流法能坡测速垂线组合分析

Analysis of The Combinations of Velocity Measuring Vertical Lines in Two-Vertical Energy Slope Method

二线能坡测流法中,计算能坡用的两条实测垂线流速,经测速垂线不同组合实例分析表明,除断面左右两岸边测速垂线外,中泓两侧其它各位置的垂线流速不同跨泓组合,能坡法测流精度均能满足流量测验规范要求。由于受测流河段顺直程度,水下地形等水力条件复杂因素影响,垂线位置的组合存在优与良的差异。为此在建立能坡法流量在线监测站时,对确定两条能坡测速垂线起点距位置,可以用历史实测流量资料进行验证分析,做出最佳优化选择。

In two-vertical energy slope method,the case study of different combinations of velocity measuring vertical lines shows that the accuracy of flow measurement can meet the requirements of the flow measurement specification with the various combinations of velocity measuring vertical lines on both sides of the midstream of channel,except the velocity measuring vertical lines on both left and right sides of the section.However,due to the complexity of hydraulic conditions such as the straightness of the measured river section and underwater topography,the combination of vertical line position can vary from being excellent to being good.Therefore,when the online flow monitoring station based on the energy slope method is being established,the distance from initial point of the two velocity measuring vertical lines can be verified with the historical data of measured flow to make the best optimization choice.