Numerical simulation of hyporheic exchange driven by an emergent vegetation patch

Lv, Jianzhang; Gao, Xueping; Sun, Bowen

doi:10.1002/hyp.14756

Cited by 6 publications

(2 citation statements)

References 65 publications

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“…This was expected because in compound channels of lowland rivers, the velocity is relatively modest and the flow is mostly subcritical. Therefore, to model the free surface, the rigid‐lib boundary condition was used, which corresponds to a symmetry plane (Lv et al, 2022).…”

Section: Numerical Methodologymentioning

confidence: 99%

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Effect of bank slope and ambient groundwater discharge on hyporheic transport and biogeochemical reactions in a compound channel

Liu,

Xiao,

Gualtieri

et al. 2023

Ecohydrology

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As floodplains are inundated during floods in a compound channel, solutes in the surface water column reach the hyporheic zone and react with solutes upwelled from the groundwater. These biogeochemical reactive processes, such as aerobic respiration, nitrification, and denitrification, need more clarification. In this study, a 3D hydrodynamic model combined with a 2D groundwater and biogeochemical model was used to examine the influence of bank slope angle and ambient groundwater discharge on these processes. A denitrification zone was found under the interface between the main channel and the floodplain when the bank slope angle was 90°, while lower angles extended that zone horizontally. In addition, a lower bank angle decreased N entry into the streambed and enhanced nitrogen removal. A decrease in ambient groundwater had a negative impact on both aerobic respiration and denitrification. When the ambient groundwater discharge reached below −0.9 m/d, nitrification was dominant in the model domain, and the hyporheic zone turned into a NO3− source. The greatest removal efficiency, equal to 0.8, was attained at a discharge rate of −0.5 m/d for ambient groundwater and a bank slope angle of 30°. The hyporheic zone should lose its ability to remove N when ambient groundwater discharges exceed 0.25 m/d and removal efficiency fluctuates by 0. In conclusion, our findings indicate that bank slope angle and ambient groundwater discharge have a substantial impact on solute transport and biogeochemical activities in the hyporheic zone of a compound channel.

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Section: Numerical Methodologymentioning

confidence: 99%

“…Therefore, to model the free surface, the rigid-lib boundary condition was used, which corresponds to a symmetry plane (Lv et al, 2022).…”

Section: Surface Water Modelmentioning

confidence: 99%