电波雷达在丹东地区中小河流洪水应急测流中的系数率定分析

Coefficient rate analysis of radar in emergency flow measurement of floods in small and medium rivers in Dandong region

电波雷达已逐步成为中小河流突发洪水应急监测较为实用的仪器,但电波雷达测定的是水面的表面流速,需进行流速系数率定,将表面流速转换成断面平均流速,再结合断面面积,得到监测的断面流量。本文以丹东地区龙湾站为实例,对电波雷达综合水面流速系数进行率定。率定结果表明:在丹东地区,电波流速枪的综合水面流速系数为0.85,综合不确定度为2.2%,基本可满足应急测流的精度要求。

Radar has gradually become a practical instrument for emergency monitoring of floods of small-and medium-sized rivers.However,only the surface velocity is measured by radar.It is also necessary to determine the velocity coefficient and convert the surface velocity into the average velocity of the river section.Section flow could be obtained by combining the average velocity and section area.This paper takes the Longwan Station in Dandong region as an example and calibrate the comprehensive radar coefficient rate of surface velocity.The results show that,in Dandong region,the comprehensive coefficient of surface velocity using radar is 0.85,and the comprehensive uncertainty reaches 2.2%,which can basically meet the accuracy requirements of emergency flow measurement.