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DOI | 10.1002/2016WR019514 |
Subsurface flow in lowland river gravel bars | |
Bray, E. N.1,2; Dunne, T.3 | |
2017-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Geomorphic and hydraulic processes, which form gravel bars in large lowland rivers, have distinctive characteristics that control the magnitude and spatial patterns of infiltration and exfiltration between rivers and their immediate subsurface environments. We present a bedform-infiltration relation together with a set of field measurements along two reaches of the San Joaquin River, CA to illustrate the conditions required for infiltration and exfiltration of flow between a stream and its undulating bed, and a numerical model to investigate the factors that affect paths and residence times of flow through barforms at different discharges. It is shown that asymmetry of bar morphology is a first-order control on the extent and location of infiltration, which would otherwise produce equal areas of infiltration and exfiltration under the assumption of sinusoidal bedforms. Hydraulic conductivity varies by orders of magnitude due to fine sediment accumulation and downstream coarsening related to the process of bar evolution. This systematic variability not only controls the magnitude of infiltration, but also the residence time of flow through the bed. The lowest hydraulic conductivity along the reach occurred where the difference between the topographic gradient and the water-surface gradient is at a maximum and thus where infiltration would be greatest into a homogeneous bar, indicating the importance of managing sand supply to maintain the ventilation and flow through salmon spawning riffles. Numerical simulations corroborate our interpretation that infiltration patterns and rates are controlled by distinctive features of bar morphology. |
英文关键词 | hyporheic gravel bed river infiltration bedform hydraulic conductivity |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413484200016 |
WOS关键词 | STREAMBED HYDRAULIC CONDUCTIVITY ; FALL CHINOOK SALMON ; RESIDENCE TIME DISTRIBUTION ; EGG BURIAL DEPTHS ; HYPORHEIC EXCHANGE ; FINE SEDIMENT ; BED FORMS ; CONVECTIVE-TRANSPORT ; CHANNEL MORPHOLOGY ; SURVIVAL |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/21299 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA; 2.Univ Calif Berkeley, Ctr Environm Design Res, Berkeley, CA 94720 USA; 3.Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, Santa Barbara, CA 93106 USA |
推荐引用方式 GB/T 7714 | Bray, E. N.,Dunne, T.. Subsurface flow in lowland river gravel bars[J]. WATER RESOURCES RESEARCH,2017,53(9). |
APA | Bray, E. N.,&Dunne, T..(2017).Subsurface flow in lowland river gravel bars.WATER RESOURCES RESEARCH,53(9). |
MLA | Bray, E. N.,et al."Subsurface flow in lowland river gravel bars".WATER RESOURCES RESEARCH 53.9(2017). |
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