globalchange  > 气候减缓与适应
DOI: 10.1002/2013GL057862
论文题名:
First direct measurements of hydraulic jumps in an active submarine density current
作者: Sumner E.J.; Peakall J.; Parsons D.R.; Wynn R.B.; Darby S.E.; Dorrell R.M.; McPhail S.D.; Perrett J.; Webb A.; White D.
刊名: Geophysical Research Letters
ISSN: 0094-8351
EISSN: 1944-8082
出版年: 2013
卷: 40, 期:22
起始页码: 5904
结束页码: 5908
语种: 英语
英文关键词: ADCP ; Black Sea ; density current ; Froude number ; hydraulic jump
Scopus关键词: ADCP ; Black sea ; Densimetric Froude number ; Density currents ; Depth-averaged velocities ; Direct measurement ; Flow transformations ; Important features ; Debris ; Deposition ; Froude number ; Ocean currents ; Sediment transport ; Submarines ; Velocity ; Hydraulic jump ; Acoustic Doppler Current Profiler ; data set ; density current ; flow modeling ; Froude number ; gravity field ; open channel flow ; pump ; turbidity current ; Black Sea
英文摘要: For almost half a century, it has been suspected that hydraulic jumps, which consist of a sudden decrease in downstream velocity and increase in flow thickness, are an important feature of submarine density currents such as turbidity currents and debris flows. Hydraulic jumps are implicated in major seafloor processes, including changes from channel erosion to fan deposition, flow transformations from debris flow to turbidity current, and large-scale seafloor scouring. We provide the first direct evidence of hydraulic jumps in a submarine density current and show that the observed hydraulic jumps are in phase with seafloor scours. Our measurements reveal strong vertical velocities across the jumps and smaller than predicted decreases in downstream velocity. Thus, we demonstrate that hydraulic jumps need not cause instantaneous and catastrophic deposition from the flow as previously suspected. Furthermore, our unique data set highlights problems in using depth-averaged velocities to calculate densimetric Froude numbers for gravity currents. ©2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887643710&doi=10.1002%2f2013GL057862&partnerID=40&md5=6d9c4d8920c7ae92299a06bcd8082858
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5615
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作者单位: School of Earth and Environment, University of Leeds, Leeds, United Kingdom

Recommended Citation:
Sumner E.J.,Peakall J.,Parsons D.R.,et al. First direct measurements of hydraulic jumps in an active submarine density current[J]. Geophysical Research Letters,2013-01-01,40(22).
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