Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025069 |
The effect of streamflow, ambient groundwater, and sediment anisotropy on hyporheic zone characteristics in alternate bars | |
A Monofy; F Boano | |
2020-12-08 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | The hyporheic exchange is the main driver for the biogeochemical transformations of nutrients within a river bed. The current study addresses the variations in hyporheic zone characteristics in alternate bars due to different streamflow, ambient groundwater, and sediment anisotropy. Several simulations, using a sequentially coupled surface water‐groundwater model of a synthetic reach with fully developed alternate bars morphology, were performed. Two hyporheic zones exist within the streambed; a shallow zone that is more linked to surface water, and a deep one that is more influenced by the groundwater variations. Increasing streamflow, and therefore bar submergence, decreases the hyporheic flow. The residence times distribution is bimodal, which implies the existence of two hyporheic zones. This bimodality is enhanced by anisotropic sediment conditions, while it is much milder in isotropic ones. The shallow zone residence times increase when streamflow value rises, while the residence times in the deep hyporheic zone are less affected. The mean and median residence times decrease by increasing streamflow in partially submerged case, and they are larger in fully submerged case. The hyporheic flow, area, residence times, and extent decrease by increasing groundwater fluxes. The deep zone is the most affected by the groundwater fluxes. Hyporheic flow and extent values are significantly larger in isotropic conditions than in anisotropic ones. The change in residence times values is different between the deep and shallow zones. A predictive model is driven to predict the hyporheic flux, residence times, and hyporheic depths dependence on bar submergence, ambient groundwater, and sediment anisotropy. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/308292 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | A Monofy,F Boano. The effect of streamflow, ambient groundwater, and sediment anisotropy on hyporheic zone characteristics in alternate bars[J]. Water Resources Research,2020. |
APA | A Monofy,&F Boano.(2020).The effect of streamflow, ambient groundwater, and sediment anisotropy on hyporheic zone characteristics in alternate bars.Water Resources Research. |
MLA | A Monofy,et al."The effect of streamflow, ambient groundwater, and sediment anisotropy on hyporheic zone characteristics in alternate bars".Water Resources Research (2020). |
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