TITLE:
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)
AUTHORS:
Affoué Berthe Yao, Kouao Armand Anoh, Loukou Alexis Brou, Menouan Wilfried Goli, Lazare Kouakou Kouassi
KEYWORDS:
Ity Mines, 1D-2D Modeling, Flooding, Cavally River, Côte d’Ivoire
JOURNAL NAME:
Open Journal of Modern Hydrology,
Vol.11 No.4,
October
30,
2021
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.