Impact of Meteorological Drought on Streamflows in the Lobo River Catchment at Nib&amp;#233;hib&amp;#233;, C&amp;#244;te d’Ivoire

Koffi, Bérenger; Kouadio, Zilé Alex; Yao, Affoué Berthe; Sanchez, Martin; Kouassı, Kouakou Lazare

doi:10.4236/jwarp.2020.126030

Cited by 9 publications

(8 citation statements)

References 22 publications

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“…The reservoir is the main source of drinking water for the city of Daloa. The Lobo River is one of the main tributaries of the Sassandra River on the left bank [19,20]. Its catchment area is not confined to a single administrative entity.…”

Section: Study Areamentioning

confidence: 99%

Evaluation of the Gamma Law for Settling Velocity and Trapping Capacity Analysis of Suspended Particles in a Dam Reservoir (Lobo River in Côte d’Ivoire)

Koffi

Sanchez

Kouadio

et al. 2023

Water

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Human activities and climate change are currently dominant processes that affect hydrological processes, resulting in alterations in water and sediment flows. Evaluation of the settling velocity of suspended solids is a critical parameter in modelling sediment transport. In this study, we investigated seasonal changes in suspended solids’ settling velocity and trapping capacity in the presence and absence of water turbulence on a dam reservoir. Using key parameters such as flow rate, mean settling velocity (V¯), critical velocity (vc), suspended solids concentration, ratio V¯/vc, and shape parameter ‘r’, the trapping capacity on the dam reservoir on the Lobo River in a tropical region was estimated. The results show that, considering the settling velocity of suspended solids, following the Gamma distribution law remains an innovative solution proposed to evaluate the trapping capacity in water reservoirs. The results show that the mean suspended solids settling velocity V¯ is well above the median rate V50%. For a parameter V¯/vc ≥ 4, there is an increase in the trapping capacity of the water retention. As established, a large proportion of the sediment is trapped. Furthermore, for a parameter V¯/vc ≤ 4, a decrease in the trapping capacity of the Lobo River water reservoir is observed.

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Section: Study Areamentioning

confidence: 99%

Evaluation of the Gamma Law for Settling Velocity and Trapping Capacity Analysis of Suspended Particles in a Dam Reservoir (Lobo River in Côte d’Ivoire)

Koffi

Sanchez

Kouadio

et al. 2023

Water

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“…1). This river is one of the tributaries of the Sassandra River (Koffi et al, 2020;Yao et al, 2012). Its catchment has an area about 7000 km 2 and is characterised by a monotonous relief with an altitude ranging between 192 and 612 m.a.s.l (Avenard, 1974).…”

Section: Study Areamentioning

confidence: 99%

Two-dimensional Numerical Simulation of Suspended Sediment Transport in Lobo Reservoir(Western-central of Côte D’ivoire)

Koffi

Sanchez

Kouamé

et al. 2022

Preprint

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Built to improve the water supply of the populations of the city of Daloa, the water reservoir of the Lobo River is no longer functioning properly due to sedimentation phenomena. This study aims to understand the hydro-sedimentary functioning of the reservoir for better management. Based on the river flows, bathymetric surveys, suspended solids concentrations, settling velocity, a two-dimensional modelling of the flows and sedimentation of the Lobo River reservoir was carried out using the MIKE 21FM/MT software. The simulation results indicate that the hydrodynamic model could reproduce the variation of water levels at the free surface of the reservoir. The results are very sensitive to the boundary conditions of the model but also to the initial conditions. A strong influence of the initial conditions on the long-term stability of the models was observed. It could be seen that in all cases the deposition rate tends towards a final value which only depends on the river flow. The trapping efficiency of the reservoir is between 26.7% and 80.4%. The different simulation scenarios indicate that the deposition thicknesses are between 0.02 and 48 mm and that the deposition occurs when the flow is loaded, during the rise and fall phase of the hydrograph. The old intake, the new intake and the weir are the preferred areas for sediment deposition in the Lobo reservoir.

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“…1). This river is one of the tributaries of the Sassandra River (Koffi et al, 2020a;Yao et al, 2012). The Lobo River impoundment is the main source of drinking water supply for the people of the city of Daloa.…”

Section: Study Areamentioning

confidence: 99%

Hydrodynamic Functioning of the Lobo River Reservoir, West-Central of Côte D’ivoire

Koffi¹,

Alexis²,

Alain³

et al. 2022

HHH

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Built to improve water supply for the populations of the city of Daloa, the Lobo River reservoir is no longer functioning properly due to human activities near its reservoir. This study, based on a 2D hydrodynamic model, carried out with the Mike21 HD software, allowed the reconstruction of the flows in the Lobo River reservoir. The results of the simulation indicate that the hydrodynamic model could reproduce the variation of water levels at the free surface of the reservoir. Also, the results are very sensitive to the boundary conditions of the model but also to the initial conditions. The results of the influence of pumping on the dynamics of water levels in the Lobo River reservoir showed that water levels are not significantly modified by pumping (less than 1.3 mm). Therefore, pumping has little impact on the hydrodynamics of the Lobo River because the pumped flows are much less than the inflow to the reservoir.

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Impact of Meteorological Drought on Streamflows in the Lobo River Catchment at Nibéhibé, Côte d’Ivoire

Cited by 9 publications

References 22 publications

Evaluation of the Gamma Law for Settling Velocity and Trapping Capacity Analysis of Suspended Particles in a Dam Reservoir (Lobo River in Côte d’Ivoire)

Evaluation of the Gamma Law for Settling Velocity and Trapping Capacity Analysis of Suspended Particles in a Dam Reservoir (Lobo River in Côte d’Ivoire)

Two-dimensional Numerical Simulation of Suspended Sediment Transport in Lobo Reservoir(Western-central of Côte D’ivoire)

Hydrodynamic Functioning of the Lobo River Reservoir, West-Central of Côte D’ivoire

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