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针对明渠非均匀流,采用立面二维数值试验的方法,并将雷诺应力垂线分布计算结果延伸至床面,以此计算减速流情况下床面摩阻流速,得到了不同壅水下床面摩阻流速的计算结果.研究表明:在壅水情况下,当流量和底坡相同时,壅水段摩阻流速随水深的增加而逐渐减小;在相同水深和底坡下,摩阻流速随流量的增加而增大;在相同流量和水深下,摩阻流速随底坡的增大而增大.为满足工程中计算的需要,根据数值试验结果拟合得到了明渠水流壅水情况下床面摩阻流速的实用计算式.
Aiming at the non-uniform flow of open channel, the method of two-dimensional numerical test of the elevation is adopted and the calculation result of the vertical distribution of Reynolds stress is extended to the bed so as to calculate the velocity of bed friction under the condition of deceleration flow, The results show that when the flow rate is the same as the bottom slope, the frictional velocity decreases with the increase of water depth at the same water depth and bottom slope, and the frictional resistance The flow rate increases with the increase of flow rate, and the friction flow velocity increases with the increase of slope at the same flow rate and water depth.In order to meet the needs of engineering calculation, the open channel water flow rate is obtained according to the numerical test results Bed friction velocity of the practical formula.