武宣(二)站悬移质输沙率间测分析

Analysis of suspended sediment discharge intermittent gauging for Wuxuan Ⅱ Station

由于上游河道水利工程增多,武宣(二)站已丧失作为一类精度泥沙站的基本条件和现实意义。为此,参照《河流悬移质泥沙测验规范》[1]规定二、三类站悬移质输沙率间测分析的条件和方法,采用该站1993-2011年期间连续19年并补充包含历年最大单沙和实测输沙率最大相应单沙在内的1983-1986年期间连续4年共23年实测输沙率成果,对武宣(二)站垂线混合法悬移质输沙率进行间测分析。结果:武宣(二)站垂线混合法综合单断沙关系线分析精度达到了间测输沙率的要求,可作为间测或精简输沙率测次的依据。

Wuxuan II Station lost the basic condition and practical significance as a sediment metering station of class I accuracy due to increase of hydraulic works on upstream reach. The sediment gauging records of this station from 1983 to 1986 contains the maximum sediment concentration in unit water sample over the years and the maximum sediment concentration in unit water sample corresponding to recorded sediment discharge. According to the conditions and method of suspended sediment discharge intermittent gauging for class II and class III stations as stipulated in the Specification for River Suspended Sediment Measurement, intermittent gauging analysis of vertical mixing method suspended sediment discharge was conducted for Wuxuan II Station with the sediment discharge records of 23 years from 1983 to 1986 and from 1993 to 2011. The analysis accuracy of vertical mixing method comprehensive single-section sediment relation curve conforms to the requirements of sediment discharge intermittent gauging, which may be the basis of intermittent gauging or simplifying measurement frequency of sediment discharge at Wuxuan II Station.