曲面流速分布模型构建及其在自动测流系统中的应用

Construction of Curved Velocity Distribution Model and Its Application in Automatic Flow Measurement System

根据江苏平原水网区河道顺直化、规整化的特点,基于常用的水平流速分布曲线、垂向流速分布曲线和流速分布测验结果,推导和构建了天然河道的流速分布(曲面)模型、全断面流量表达公式以及纵剖面流量表达公式,进而采用超几何函数原理,推导和构建了横剖面流量表达公式。结果表明:江苏平原水网区河道H-ADCP安装高度建议在相对水深0.4~0.65之间,横剖面层平均流速与断面平均流速的关系采用一元一次函数关系推求。

according to the characteristics of river straightening and regularization in Jiangsu Plain water network area, based on the commonly used horizontal velocity distribution curve, vertical velocity distribution curve and velocity distribution test results, this paper deduced and constructed the velocity distribution(curved surface) model of natural river. The full section flow expression formula and the longitudinal section flow expression formula, and then the cross section flow expression formula was deduced and constructed by using the principle of hypergeometric function. The results show that the installation height of H-ADCP in the river channel of Jiangsu Plain water network area is recommended to be between 0.4 ~ 0.65 relative water depth, and the relationship between the average velocity of cross section layer and the average velocity of cross section is deduced by one-dimensional firstorder function.