Water exchange and pollutant diffusion law in Gangnan reservoir

Zhang, Shaoxiong; He, Hanxiao; Zhang, Bin; Zhang, Liting

doi:10.1016/j.aej.2022.06.022

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…One of the aspects related to filtration in reservoirs, correlations for convective diffusion and determination of salt dissolution coefficients, had been proposed. In this case, the convective diffusion equations were constructed, and the problem was solved under conditions where all the salts in the cracks were dissolved, and the diffusion coefficient did not depend on the filtration rate [14,15]. In addition, the water reservoirs, particularly the Akdarya reservoir, analyzed the state of turbidity.…”

Section: Introductionmentioning

confidence: 99%

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

2023

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The Republic of Uzbekistan pays great attention to the development and implementation of a program for the development of hydropower based on ensuring the share of hydropower in the energy potential and the integrated development of hydropower potential. Over the last three years, hydropower plants have been built or reconstructed in more than a dozen small and medium-sized earth dams to accomplish this task. Typically, unstable filtration is observed in the body of earth dams because of deviations from the normal filling and emptying of water reservoirs. The main goal of the research is to determine the time to lower the depression surface in the Tupalang earth dam transition zones, which characterizes the intensity of unstable filtration during a smooth and sudden drop in reservoir water level. The calculations were made according to the theoretical dependences of V.P.Nedriga for two cases of smooth and sudden lowering of the water level in the reservoir, starting from the normal backed level (NBL). In the calculations, the values of the main parameters were taken to be the coefficient of water loss of the soil (0.3), the coefficient of filtration of the transition zones (9.5 m/day), and the coefficient of laying the slope of the transition zones (0.2). Calculations showed that the time of lowering the depression surface in the transition zones with a gradual decrease in the water level in the reservoir was 84.1 days, and with an instantaneous decrease in the water level during the operation of a dam with a height of 120 m 3.86 days, and during the operation of a dam with a height of 185 m 6.82 days.

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Section: Introductionmentioning

confidence: 99%

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

2023

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Impact of flow on the deposition and sediment trapping capacity in a West African reservoir (case of the Lobo River reservoir, west-central of Côte d’Ivoire)

Koffi,

Sanchez,

Kouamé

et al. 2023

Environ Earth Sci

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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 hydrosedimentary 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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Occurrence, spatiotemporal dynamics, and ecological risk of fungicides in a reservoir-regulated basin

Zhu

Ouyang

Guo

et al. 2023

Environment International

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Water exchange and pollutant diffusion law in Gangnan reservoir

Cited by 4 publications

References 12 publications

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

Impact of flow on the deposition and sediment trapping capacity in a West African reservoir (case of the Lobo River reservoir, west-central of Côte d’Ivoire)

Occurrence, spatiotemporal dynamics, and ecological risk of fungicides in a reservoir-regulated basin

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