Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021WR030299 |
Laboratory Flume and Numerical Modeling Experiments show Log Jams and Branching Channels increase Hyporheic Exchange | |
K. Wilhelmsen; A.H. Sawyer; A. Marshall; S. McFadden; K. Singha; E. Wohl | |
2021-09-13 | |
发表期刊 | Water Resources Research
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出版年 | 2021 |
英文摘要 | Log jams alter gradients in hydraulic head, increase the area available for hyporheic exchange by creating backwater areas, and lead to the formation of multiple channel branches and bars that drive additional exchange. Here, we numerically simulated stream-groundwater interactions for two constructed flume systems—one without jams and one with a series of three jams—to quantify the effects of interacting jam structures and channel branches on hyporheic exchange at three stream flow rates. In simulations without jams, average hyporheic exchange rates ranged from 2.1x10-4 to 2.9x10-4 m/s for various stream discharge scenarios, but with jams, exchange rates increased to a range of 1.3x10-3 to 3.5x10-3 m/s. Largely due to these increased hyporheic exchange rates, jams increased stream-groundwater connectivity, or decreased the turnover length that stream water travels before interacting with the hyporheic zone, by an order of magnitude, and drove long flow paths that connected multiple jams and channel threads. Decreased turnover lengths corresponded with greater reaction significance per km, a measure of the potential for the hyporheic zone to influence stream water chemistry. For low-flow conditions, log jams increased reaction significance per km five-fold, from 0.07 to 0.35. Jams with larger volumes led to longer hyporheic residence times and path lengths that exhibited multiple scales of exchange. Additionally, the longest flow paths connecting multiple jams occurred in the reach with multiple channel branches. These findings suggest that large gains in hydrologic connectivity can be achieved by promoting in-stream wood accumulation and the natural formation of both jams and branching channels. |
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/338743 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | K. Wilhelmsen,A.H. Sawyer,A. Marshall,et al. Laboratory Flume and Numerical Modeling Experiments show Log Jams and Branching Channels increase Hyporheic Exchange[J]. Water Resources Research,2021. |
APA | K. Wilhelmsen,A.H. Sawyer,A. Marshall,S. McFadden,K. Singha,&E. Wohl.(2021).Laboratory Flume and Numerical Modeling Experiments show Log Jams and Branching Channels increase Hyporheic Exchange.Water Resources Research. |
MLA | K. Wilhelmsen,et al."Laboratory Flume and Numerical Modeling Experiments show Log Jams and Branching Channels increase Hyporheic Exchange".Water Resources Research (2021). |
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