Predictive model for stage-discharge curve in compound channels with vegetated floodplains
Predictive model for stage-discharge curve in compound channels with vegetated floodplains
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DOI：
10.1007/s10483-014-1884-6
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发表时间：
2014-10
影响因子：
--
通讯作者：
Chao Liu;Xing-nian Liu;Kejun Yang
中科院分区：
文献类型：
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作者：
Chao Liu;Xing-nian Liu;Kejun Yang
根据植被复合河道的水流连续性方程和动量方程，建立了单位宽度流量的控制方程。给出了单位宽度流量的解析解，包括床层摩擦、横向动量传递、阻力和二次流的影响。采用简单易行的数值积分方法，即复合梯形公式，计算分区流量和总流量的近似解。与英国洪水河道设施（UK-FCF）已发表的实验数据进行比较表明，该模型不仅能够预测植被复合河道的阶段流量曲线，还能够预测分区流量。讨论并分析了积分区间划分数和二次流量系数这两个关键参数对总流量的影响。
The governing equation of the discharge per unit width, derived from the flow continuity equation and the momentum equation in the vegetated compound channel, is established. The analytical solution to the discharge per unit width is presented, including the effects of bed friction, lateral momentum transfer, drag force, and secondary flows. A simple but available numerical integral method, i.e., the compound trapezoidal formula, is used to calculate the approximate solutions of the sub-area discharge and the total discharge. A comparison with the published experimental data from the U. K. Flood Channel Facility (UK-FCF) demonstrates that this model is capable of predicting not only the stage-discharge curve but also the sub-area discharge in the vegetated compound channel. The effects of the two crucial parameters, i.e., the divided number of the integral interval and the secondary flow coefficient, on the total discharge are discussed and analyzed.