Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028817 |
Hyporheic exchange in sand dunes under a freely deforming river water surface | |
Anzy Lee; Antoine F. Aubeneau; Xiaofeng Liu; M. Bayani Cardenas | |
2021-02-25 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Bedform‐driven hyporheic exchange is conditioned by the head gradients at the sediment‐water interface. Local exchange phenomena between the surface and the subsurface are often driven by the dynamic forces related to the velocity distributions around sediment waves. In open channels, the static forces are represented by the water depth, yet most computational fluid dynamics models use a rigid‐lid approximation. We investigated whether and when the deformation of the river's free‐surface influences bedform‐driven hyporheic exchange. This was done through simulations of coupled open‐channel and hyporheic flows with the air‐water interface modeled either as a free‐surface or a rigid‐lid across increasing subcritical Froude numbers from ∼0.05 to ∼0.95. The normalized hyporheic flux was higher when considering free‐surface deformation across most of the range of Froude numbers considered. When the Froude number was larger than 0.6 and smaller than 0.85, both hydrostatic and non‐hydrostatic‐driven fluxes increased significantly compared to the rigid‐lid approach and the total flux was about 5 times that predicted with the rigid‐lid. These results indicate that bedform‐driven hyporheic fluxes are underestimated in most studies that use a rigid‐lid assumption in subcritical flows. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/315857 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Anzy Lee,Antoine F. Aubeneau,Xiaofeng Liu,et al. Hyporheic exchange in sand dunes under a freely deforming river water surface[J]. Water Resources Research,2021. |
APA | Anzy Lee,Antoine F. Aubeneau,Xiaofeng Liu,&M. Bayani Cardenas.(2021).Hyporheic exchange in sand dunes under a freely deforming river water surface.Water Resources Research. |
MLA | Anzy Lee,et al."Hyporheic exchange in sand dunes under a freely deforming river water surface".Water Resources Research (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论