Density effects on solute release from streambeds

Jin, Guangqiu; Yang, Wenhai; Xu, Huji; Zhang, Zhongtian; Yuan, Saiyu; Tang, Hongwu; Li, Ling; Barry, David Andrew

doi:10.1002/hyp.13655

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…At T 2 = T 0 + 5 min, the qualitative pattern was similar to that observed at T 1 . However, the difference was that the exchange depth increased, the horizontal flow of pore water played a leading role, the solute expanded along the transverse direction, intersecting with the downward solute path, and the mixing was enhanced, forming a finger flow at the edge of the active hyporheic exchange zone (Jin, Hao, et al, 2020; Jin, Yang, et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Numerical simulation of hyporheic exchange driven by an emergent vegetation patch

Gao

Sun

2022

Hydrological Processes

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Vegetation patches increase the pressure gradient of local channels and can create an uneven pressure distribution at the water–sediment interface, thereby driving hyporheic exchange. However, this process has rarely been discussed. We investigated the spatiotemporal characteristics of hyporheic exchange under the influence of multiple factors. A bidirectional coupling model of the overlying water and sediment with an emergent vegetation patch was adopted. The results show that hyporheic exchange driven by vegetation patches are spatially heterogeneous. The active area of hyporheic exchange was concentrated directly below the vegetation patch. A finger flow was formed at the edge of the active hyporheic exchange zone as the exchange took place. Furthermore, intermittent downward solute transport path (IDSTP) was formed downstream of the vegetation patch, and the exchange rate was one order of magnitude smaller than that of the hyporheic exchange active zone. Hyporheic exchange occurred at the stem and patch scales when the vegetation density was relatively high. There was a logarithmic relationship between the hyporheic exchange flux and sediment permeability, and a power function relationship existed between the hyporheic exchange flux and Reynolds number. The active area of hyporheic exchange will help predict pollutant transport and understand vegetation's nutrient absorption process. IDSTP will provide references for vegetation patch expansion.

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Section: Resultsmentioning

confidence: 99%

Numerical simulation of hyporheic exchange driven by an emergent vegetation patch

Gao

Sun

2022

Hydrological Processes

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“…In the presence of perturbations in the overlying water flow or alterations in the environmental conditions of the water body, such as variations in pH, dissolved oxygen concentration, and hydraulic conductivity of the sediments, contaminants within the sediment layer may be released back into the water. This phenomenon potentially resulting in secondary pollution in river systems, poses substantial threats to aquatic ecosystems and human health [3,4] . Therefore, it is crucial to study the transport of the dissolved constituents between overlying water and sediment in aquatic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulations of Zinc ions transfer to turbulent flows from hyporheic zone

Jin,

Chen,

Zhang

et al. 2024

Preprint

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Metal contaminants from surface water pollution events often enter hyporheic zones, under certain conditions, they may be released back into streams, causing secondary pollution to the water quality. The present study investigated the effects of adsorption, permeability, and anisotropy of sediment beds on the release of zinc ions (Zn2+) from the hyporheic zone into overlying turbulent flows using large-eddy simulations (LES). The volume-averaged Navier-Stokes equations and advection-diffusion equation with adsorption term were used to describe the sediment in-flow, adsorption, and convective diffusion of Zn2+ within the sediment layer. The effects of sediment permeability on the Zn2+ concentration distribution and mass transfer processes were investigated by time-averaged statistics of flow and concentration fields. The results show that adsorption becomes stronger as the pH value increases, leading to a slow increase in Zn2+ concentration in the overlying water layer and reaching a lower steady-state concentration. Higher overall permeability of the sediment layer can enhance mass and momentum exchange near the sediment-water interface (SWI), and intensify the release of Zn2+ from the sediment layer into the overlying water. As the wall-normal permeability of the sediment layer increases, the normal turbulent intensity strengthens, momentum transport enhances the wall-normal Zn2+ concentration flux increases, the effective diffusion coefficient increases, and the concentration in the overlying water increases.

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“…The periodic fluctuations of water levels also modify the hydrodynamic conditions, leading to changes in the rate of solute transport (Krause et al., 2007). The pollutants accumulated in the sediment may be released when the hydrodynamics of the overlying water changes (G. Q. Jin et al., 2020; H. Zhang et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The pollutants accumulated in the sediment may be released when the hydrodynamics of the overlying water changes (G. Q. Jin et al, 2020;H. Zhang et al, 2017).…”

mentioning

confidence: 99%

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

Chen,

Zhang,

Jin

et al. 2023

Water Resources Research

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Seasonal lakes appear in floodplain systems due to the seasonal variation of water level of rivers or main lakes and play an important ecological function. Previous studies have focused on exchange flux between the surface water and groundwater in seasonal lakes, but the process of solute transport at the sediment‐water interface under the effect of seasonal water level fluctuations remains unclear. In this study, laboratory flume experiments and numerical simulations were conducted to investigate non‐reactive solute transport and exchange in a seasonal lake under effects of hydrological connectivity, water level amplitude, sediment permeability and solute source. The results show that the recharge pattern between seasonal lakes and rivers or main lakes is determined by the seasonal water level. The solute transports from the groundwater of seasonal lakes to the main lake during the dry season, while the reverse applies during the wet season. The perennial hydrological isolation increases the concentration in the overlying water and pore water of the seasonal lake by 20.5% and 28.7%, respectively. The solute concentration in the overlying water and pore water of the seasonal lake decreases by 55.2% and 51.5%, respectively, when solute source occurs in the main lake compared with that occurs in the seasonal lake. The amplification of water level amplitudes leads to an increase of 6.46% and 10.55% in the solute concentration drop from the overlying water, respectively. These findings contribute to improving water resource utilization and protecting aquatic ecological environment in floodplain systems.

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Density effects on solute release from streambeds

Cited by 7 publications

References 37 publications

Numerical simulation of hyporheic exchange driven by an emergent vegetation patch

Numerical simulation of hyporheic exchange driven by an emergent vegetation patch

Large eddy simulations of Zinc ions transfer to turbulent flows from hyporheic zone

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

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