A. Yao, K. Anoh, Loukou Alexis Brou, Menouan Wilfried Goli, L. K. Kouassi
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引用次数: 0
摘要
近年来,卡瓦利河受到多种活动的影响,包括建设导流渠道和一座桥梁,使其容易受到洪水的影响。为了评估这些水工建筑物对河流水动力功能的影响,实现了一个1D-2D模型。3d -2D模型的实现包括先运行1D模型,然后运行2D模型,最后将两者耦合。采用1988年洪水线设计一维-二维模型,小河床的曼宁系数为0.052 m 1/3 /s,大河床的曼宁系数为0.06 m 1/3 /s。水力模型计算结果表明,水流速度与自然运行时的速度基本一致。在小河床上的速度值在0.4 ~ 1.3 m/s之间,在洪泛平原上的速度值在0.06 ~ 0.71 m/s之间。构筑物施工前洪水传播平均水位为262.37±0.44 m,构筑物施工后平均水位为262.23±0.85 m。由于引水渠和桥梁造成的0.41米的水位下降与卡沃利河全年6 - 7米的总波动相比微不足道。
Simulation of the Hydrodynamic Functioning of the Cavally River Using a Coupled 1D-2D Model in the Ity Area (Zouan-Hounien in Côte d’Ivoire)
In recent years, the Cavally River has been subject to multiple activities, including the construction of diversion channels and a bridge that makes it vulnerable to flooding. In order to assess the impact of these hydraulic structures on the river hydrodynamic functioning, a 1D-2D model was realized. The implementation of the 1D-2D model consisted of first running the 1D model, then the 2D model, and finally in coupling them. The 1D-2D model was designed with the 1988 flood hydrograph, a Manning’s coefficient of 0.052 m 1/3 /s for the minor bed and 0.06 m 1/3 /s for the major bed. The results of the hydraulic model show that the velocities are almost identical to those of the Cavally in natural operation. The values of the velocities are included between 0.4 m/s and 1.3 m/s at the level of the minor bed of the river and between 0.06 m/s and 0.71 m/s at the level of the floodplains. The average water level for flood propagation is 262.37 ± 0.44 m before construction of the structures and 262.23 ± 0.85 m after construction of the structures. The 0.41 m reduction in water level due to the diversion canal and bridge is negligible compared to the total fluctuations of the Cavally River, which vary from 6 to 7 m over the year.