大赉水文站测速垂线精简测点的分析探讨

利用2007年大赉水文站总计30次用三点法实测流量资料,通过对流量、垂线平均流速两个方面分析得知,大赉水文站测速垂线精简测点后,采用相对水深0.2、0.8测点测流与采用相对水深0.2、0.6、0.8测点测流,两种方法计算的流量对比,总的系统误差为-0.36%。并对两种测流方法进行了单次流量随机不确定度验证,符合《河流流量测验规范》精度要求。其意义在于缩短测流历时,把流量测验的重点投入到增加测验次数上,满足大洪水时期,水位变幅大,测次不足的问题。尤其在主汛期可及早报出流量,为防汛抗洪服务。

Discussion of the analysis for the cutting measure points of measuring vertical velocity in Dalai hydrometric station

Using the flow information of Dalai Hydrometric Station in 2007,with a total of 30 three-point method measured,through the analysis of flow and the average vertical velocity,after the Station cut the vertical measure points,comparing the two methods of measuring flow with the relative water depth of 0.2,0.8 and 0.2,0.6,0.8,the total system error is-0.36%.And two flow measurement methods for single random uncertainty of the flow test,is satisfied the requirement of the River Flow Test Norms.Its significance is reduced flow measurement time;the focus of the test is increasing the number of tests to meet the water level large variation,measuring shortage problems during the flood period,especially in the main flood season.