Abstract
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 m1/3/s for the minor bed and 0.06 m1/3/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.
Highlights
Water is a very important resource for the development of life on the Earth planet
The Cavally River has been subject to multiple activities, including the construction of diversion channels and a bridge that makes it vulnerable to flooding
The analysis of the observed and simulated water lines shows a good synchronization. This good similarity between the observed and simulated values is highlighted by the statistical criteria that are the Nash coefficient (0.87 for calibration and 0.83 for validation) and the Root Mean Square Error (RMSE) coefficient (0.081 for calibration and 0.065 for validation)
Summary
Water is a very important resource for the development of life on the Earth planet. the development of almost all socio-economic activities depends on its availability. According to [6], the Cavally watershed is subject to all kinds of anthropogenic activities Among these activities, agriculture, livestock and, industrial and artisanal mining contribute strongly to the modification of the river hydrological functioning. The impact of hydraulic developments on the river hydrodynamic functioning has been shown by [7]. The latter highlighted the extent of flood wave propagation and probable flood zones near the perimeter of Ity Mining Company (SMI). The objective of this study is to evaluate the impact of hydraulic structures on the hydrodynamic functioning of Cavally River. To achieve this objective, coupled 1D/2D modeling remains the first approach tool to understand the hydrodynamic behavior of the river in the minor and major beds
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