Hydraulic calculation of steady uniform flows in trapezoidal compound open channels
Hydraulic calculation of steady uniform flows in trapezoidal compound open channels
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DOI：
10.1007/s10483-010-1329-z
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发表时间：
2010-07
影响因子：
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通讯作者：
Y. Zeng;Yue‐hua Wang;W. Huai
中科院分区：
文献类型：
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作者：
Y. Zeng;Yue‐hua Wang;W. Huai
对梯形复合明渠恒定均匀流水力计算进行了研究。根据各河段水的力平衡，推导出主槽、边坡、滩地的平均流速。用表观剪应力表示了横截面之间的横向动量交换。为了验证模型的正确性，使用了7组英国防洪道设施(UK-Fcf)的实测数据进行比较，这些数据的滩地和主航道之间的相对水深变化在0.057~0.4%之间。结果表明，相对水深较小时，计算流速大于实测值；相对水深较大时，计算流速小于或接近实测值。表观剪应力对滩地流速计算的影响不明显，而对主航道的影响较大。将三级模型与刘的两级模型进行了比较，结果表明，三级模型对三级梯形复式航道的预报效果较好。最后，计算了表观剪应力，并与实测值进行了比较。结果表明，动量传递系数的取值是合理的。
Hydraulic calculation of steady uniform flows in trapezoidal compound open channels is studied. Based on the force balance of water in each sub-section, the average velocities of the main channel, side slope, and floodplain are derived. The lateral momentum exchanges between the sub-sections are expressed by using the apparent shear stress. To verify the model, seven groups of UK Flood Channel Facility (UK-FCF) measured data with a relative water depth between the floodplain and the main channel varying from 0.057 to 0.4 are used for comparison. The result shows that the calculated velocity is larger than the measured data when the relative water depth is small, while it is less than or close to the measured value in the case of a larger relative water depth. The influence of the apparent shear stress on the calculation of velocity on the floodplain is not obvious, while it is much greater on the main channel. The three-stage model is compared with Liu’s two-stage model, showing that the former can give a better prediction for a three-stage trapezoidal compound channel. Finally, the apparent shear stress is calculated and compared with the measured data. The result shows that the chosen values of the momentum transfer coefficients are appropriate.