Resesarch on computing method for channel roughness of the Middle Route of South-to-North Water Diversion Project
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Abstract:
In order to determine the reasonable channel roughness values for the Middle Route of South-to-North Water Diversion Project, we selected three methods ( Kai-lin Yang fo rmula, U.S. Bureau of Reclamation formula, and U.S. Army Corps of Engineers formula) and established one optimized method to caculate the roughness; then we tested the validity of the roughness values using the hydraulic model for main canal of South-to-North Water Diversion Project. The model and the method were applied to ten stable working conditions of the channel from Diaohe Gate to Tuanhe Gate. The roughness values caculated by the four methods were 0.01538, 0.0156, 0.01389, and 0.0169, respectively. Then the roughness values were put into the hydraulic model to caculate the water level behind Diao he Gate. The sum of relative error between caculated and measured values of the ten working conditions were 0.1744% , 0.1586% , 0.3028% , and 0.0947% , respectively . Results showed that the optimized method was the best at caculating channel roughness. We suggest that it be applied to South-to-North Water Diversion Project.
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