内陆河流域河流水面流速系数比测试验研究

Comparative Experiment Study on River Surface Velocity Coefficients for Inland River Basin

水面流速系数是流量测验中经常使用的参数。目前，大部分水文站使用水面流速系数均选用经验值．为提高流量测验精度，2003-2007年间，在内陆河流域代表站莺落峡、高崖、正义峡、祁连、肃南水文站开展了对水面流速系数的比测试验工作，取得大量比测试验资料。通过分析得出试验分析成果．并对试验分析计算方法和比测试验方法进行了探讨。水面流速系数分析计算方法采用算术平均法、回归分析法。两种分析方法得出的结论基本一致，算术平均法是对回归分析成果的校核，因此均采用回归分析法比测试验分析成果。以莺落峡站为例对垂线比测法和断面流量比测法两种不同比测试验方法进行对比分析和比测试验方法优选。垂线比测法和断面流量比测法均能得到比较满意的结果，相关系数均达0．95以上，分析成果比较接近。断面流量比测法理论比较严密．得到的水面流速系数适合全断面应用。这些试验分析成果为提高流量测验精度提供理论依据。

Water surface velocity coefficients as parameters are often used in discharge measurement. At present, empirical values are usually selected for water surface velocity coefficients at most hydrometric stations. In order to improve precision of discharge measurement, comparative experiment study on river surface velocity coefficients was made at the stations of Yingluoxia, Gaoya, Zhengyixia, Qilian and Sunan in the inland river basin from 2003 to 2007, in which lots of comparative experimental data were obtained. Through analyzing experimental results, the method of experiment analysis and method of comparative experiment were studied. The arithmetic average analysis and regression analysis were used the method of experiment analysis, of which the conclusions are consistent. Regression analysis was used to comparatively measure with the results of experimental analysis, because arithmetic average can check the results of regression analysis. Yingluoxia station was taken as an example to comparatively analyze and optimize two various methods of veItical ratio measurement and section flow ratio measurement, which shows that two methods can get satisfactory results, both of the correlation coefficients get over 0.95.