水工模型多条有压隧洞联合泄流糙率校正方法

Roughness correction methods for hydraulic model tests on combined discharge of multiple pressure tunnels

针对水利水电工程多条有压隧洞联合泄流时传统的糙率修正方法工作量大且精度不高这一问题,对多条有压隧洞联合泄流的糙率校正方法进行研究,采用一封闭的方程组求解各有压隧洞的水位校正值和实际过流量。此方程组考虑了有压隧洞间的互相影响,且仅需测量1组次多条有压隧洞同时泄流时的水位、流量数据。该方法在金沙江流域其宗水电站5条有压隧洞联合泄流模型试验中的应用表明,计算简单方便,可节省大量时间,糙率校正后的试验结果准确可靠。

With regard to the large workload and low accuracy of the traditional roughness correction methods for the combined discharge of multiple pressure tunnels in hydropower engineering, the roughness correction methods for the combined discharge of multiple pressure tunnels were studied. A closed equation set was employed to solve the corrected water levels and actual discharges of the multiple pressure tunnels. The interrelations among various pressure tunnels in the equation set were considered, and only one group of data of water levels and discharges of should be measured under the simultaneous discharge of the multiple pressure tunnels. The application of the above method in the combined discharge of five pressure tunnels of Qizhong Hydropower Station in Jinsha River basin shows that the proposed method is simple and convenient and can save much time, and the test results after roughness correction are accurate and reliable.