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《China Water Power & Electrification》 2012-08
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Simplified Calculation Method of Critical Water Depth on the U-shaped Tunnel Water Passing Cross-section

ZHENG Bo1,TENG Kai2(1.Nenjiang Nierji Water and Hydropower Co.,Ltd.,Qiqihar 161006,China;2.Qiqihaer Water Authority,Qiqihaer 161006,China)  
Aiming at the problems of more complicated calculation method of U-shaped tunnel water passing cross section critical water depth,and the like,based on optimized fitting principle,standard residual difference minimum is used as objective function,approximation fitting is conducted in the parameter range applicable to project,and a simplified calculation method is proposed.The expression form of the method approximate to formula is more simple and intuitive without segmentation and discriminant selection,the actual calculation can be rapidly finished by the aid of calculator.Analysis of cases and accuracy comparison show that the fitting alternative precision of simplified calculation method is higher than relevant literature,the maximum fitting relative error is only 0.58%,the points with fitting relative error less than 0.58% account for 95% of total calculation points,which can completely meet the design accuracy requirements of the actual project.
【CateGory Index】: TV131.4
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