DOI: 10.1002/2016GL069547
论文题名: Enhanced sedimentation beneath particle-laden flows in lakes and the ocean due to double-diffusive convection
作者: Davarpanah Jazi S. ; Wells M.G.
刊名: Geophysical Research Letters
ISSN: 0094-8477
EISSN: 1944-8208
出版年: 2016
卷: 43, 期: 20 起始页码: 10883
结束页码: 10890
语种: 英语
英文关键词: double-diffusive convection
; interflows
; overflows
; sediment fingers
; settling-driven convection
Scopus关键词: Heat convection
; Lakes
; Sedimentation
; Acoustic Doppler velocimeter
; Double-diffusive convection
; interflows
; Marginal densities
; overflows
; Particle laden flows
; Settling velocity
; Visual measurements
; Sediments
英文摘要: The transport rate of particles beneath sediment-laden overflows and interflows in lakes and the ocean can be enhanced by double-diffusive and settling-driven convection. In previous experiments with sediment-laden fluid overlaying a saline layer, visual measurements could only be made in the optically clear lower layer. Hence, there was difficulty distinguishing the two processes, hindering predictions of when enhanced sedimentation occurs. We used an Acoustic Doppler Velocimeter to measure velocities and turbulence above and below the initial sediment/salt interface. The velocity of the sediment fingers in the lower layer were always larger than the Stokes settling velocity of the particles, leading to an asymmetry in the flow field of the two convective layers. Sediment fingers only dominated when there were marginal density differences between the two layers. We conclude that double-diffusive sediment fingers control sedimentation beneath interflows in most lakes, whereas settling-driven convection is dominant in most oceanic overflows. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84995639332&doi=10.1002%2f2016GL069547&partnerID=40&md5=a3301bb1e38b6d6ec12aee32dfba6c73
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9440
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON, Canada
Recommended Citation:
Davarpanah Jazi S.,Wells M.G.. Enhanced sedimentation beneath particle-laden flows in lakes and the ocean due to double-diffusive convection[J]. Geophysical Research Letters,2016-01-01,43(20).