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• W3198807730 abstract "• Explore impact time of saline sediment on reservoir water considering infiltration. • Propose a criterion for determining the influence time by an improved Pe . • Develop a single-domain model to efficiently simulate sediment-water interactions. • Accurately calculate the influence time by combining the model with Pe . • Deduce an empirical formula to effectively estimate the influence time. The influence time of polluted sediments on water quality, as well as the influence degree, plays a key role in decision-making for sediment pollution control. However, factors that determine influence time, especially slow infiltration through sediments, are poorly known. Further, there is a lack of corresponding indexes and efficient models to accurately identify the critical moment in determining the influence time from the dynamic process of interaction between downward advection (infiltration) and upward diffusion at the sediment-water interface. Therefore, this article focuses on methods for determining the influence time of saline sediments on reservoir water salinisation. An alternative expression of Péclet number ( Pe = uC D ∂ C / ∂ x x = 0 ) is proposed to characterise the transient relative role of downward advection versus upward diffusion on the transport of non-reactive solutes; Pe = 1 can be used as an exact criterion for identifying the critical moment when saline sediments no longer affect the overlying water. We then developed a single-domain model that does not require an alternate run the two subdomains in solving processes, enabling to flexibly simulate sediment-water interactions, both effectively and efficiently. By combining this model with the alternative Pe , the influence time of saline sediments on reservoir water can be accurately determined. We used the planned Muguandao Coastal Reservoir, Qingdao, China, as an example to explore the effects of infiltration on the influence time. The influence time shortens with infiltration rates in a power function relationship and decreases from 970 years to 19.3 years in the rate range of (1–7) ×10 −2 m/year. Furthermore, based on the simulation and sensitivity analysis, we suggest a simple formula ( t = 5.25 D / u 2 ) to directly predict the influence time of saline sediments on water salinisation for shallow mixed coastal reservoirs. The importance of understanding slow infiltration in determining the influence time is discussed." @default.
• W3198807730 created "2021-09-13" @default.
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• W3198807730 date "2021-12-01" @default.
• W3198807730 modified "2023-09-27" @default.
• W3198807730 title "Inclusion of slow infiltration in determining the influence time of saline sediments on reservoir water" @default.
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• W3198807730 doi "https://doi.org/10.1016/j.jhydrol.2021.126853" @default.
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