河道流量测量与计算方法研究

The Study of Measurement and Calculation Method on River Discharge

获得河道流量常用的方法是实测流速乘以面积法和实测水位转换法。测流速精度高但成本高,而直接由水位估算流量经济但精度不够高。采用飞来峡水文站实测的流速与流量,对中泓一点法、水位流量法和水位-流速-流量拟合法3种方法进行了对比研究。发现在传统的水位流量关系中加入了一个点的流速后能够显著的提高流量的计算精度。基于现在流速仪技术的发展,可以在河道断面长期布置一单点流速仪,实时观测一点流速,所以采用水位-流速-流量法是未来获得高精度河道流量的可行方案。

There are two methods that we used to obtain the river flow ,one is the flow velocity multiplied by the area ,the other one is getting river discharge by water level .If we want to get high precision flow velocity ,we must have high costs ,and estimating by water level is economical but the accuracy is not high enough .In this paper ,we compare three methods We have found that after the flow velocity is added into stage-discharge relation ,the accuracy of results is significantly improved .Now based on technology devel‐opment of current meter ,we can arrange a single-point current meter in river section for a long time to observe flow velocity in real-time .Therefore ,the water level-flow velocity-flow method is a feasible solution to get highly accurate river flows in the future .