GSTDTAP  > 资源环境科学
DOI10.1029/2020WR027719
Local and Reach‐Scale Hyporheic Flow Response From Boulder Induced Geomorphic Changes
T. Dudunake; D. Tonina; W. J. Reeder; A. Monsalve
2020-10-06
发表期刊Water Resources Research
出版年2020
英文摘要

Stream hydromorphology regulates instream water flow and interstitial flow of water within streambed sediments, the latter known as hyporheic exchange. Whereas hyporheic flow has been studied in sand‐bedded streams with ripples and dunes and in gravel‐bedded streams with pool‐riffle morphology, little is known about its characteristics in plane bed morphology with subdued streambed undulations and sparse macro‐roughness elements such as boulders and cobbles. Here, we present a proof‐of‐concept investigation on the role of boulder‐induced morphological changes on hyporheic flows based on coupling large‐scale flume sediment transport experiments with computational fluid dynamics. Our results show that placement of boulders on plane beds increase the reach scale hyporheic median residence time, τ50, by 15% and downwelling flux, qd, by 18% from the plane bed. However, reach scale hyporheic exchange changes are stronger with τ50 decreasing by 20% and qd increasing by 79% once the streambed morphology reached equilibrium (with the imposed upstream sediment and flow inputs on boulders). These results suggest that hyporheic flow is sensitive to the geomorphic response from bed topography and sediment transport in gravel‐bedded streams, a process that has been overlooked in previous work.

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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/297910
专题资源环境科学
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T. Dudunake,D. Tonina,W. J. Reeder,等. Local and Reach‐Scale Hyporheic Flow Response From Boulder Induced Geomorphic Changes[J]. Water Resources Research,2020.
APA T. Dudunake,D. Tonina,W. J. Reeder,&A. Monsalve.(2020).Local and Reach‐Scale Hyporheic Flow Response From Boulder Induced Geomorphic Changes.Water Resources Research.
MLA T. Dudunake,et al."Local and Reach‐Scale Hyporheic Flow Response From Boulder Induced Geomorphic Changes".Water Resources Research (2020).
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