DOI: 10.1002/2017JF004202
Scopus记录号: 2-s2.0-85043478999
论文题名: Turbidity Current Dynamics: 2. Simulating Flow Evolution Toward Equilibrium in Idealized Channels
作者: Traer M.M. ; Fildani A. ; Fringer O. ; McHargue T. ; Hilley G.E.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 3 起始页码: 520
结束页码: 534
语种: 英语
英文关键词: channel levee
; flow stripping
; overspill
; submarine
; turbidity current
; uniform flow
Scopus关键词: channel flow
; computer simulation
; flow modeling
; grain size
; levee
; one-dimensional modeling
; sediment transport
; submarine channel
; turbidity current
; underwater environment
英文摘要: This study simulates turbidity currents through a number of idealized channels using a steady, one-dimensional, depth-averaged model to determine if modeled flows starting from a wide range of initial conditions might reach an equilibrium state where clear-water entrainment balances fluid mass lost to flow stripping or overspill processes. To accomplish this, we calculated flow dynamics based on 1,000 sets of randomized initial conditions, identified flows that successfully traversed the system, and then extracted the flow height, velocity, and sediment flux at the channel terminus. We then systematically changed channel and flow properties using a wide range of values and calculated the length required for the simulated currents to reach the new equilibrium conditions. We found that modeled turbidity currents may evolve to a single equilibrium state consistent with the physical channel and flow properties regardless of the initial flow conditions. Additionally, we found that simulated turbidity currents generally required 1–40 km of downflow distance to adjust to new equilibrium conditions resulting from changes in the channel slope, channel height, channel width, coefficient of bed friction, and meander radius of curvature. Changes in sediment grain size and suspension cloud concentration resulted in adjustment lengths exceeding 100 km. Shorter adjustment lengths resulting from flow stripping suggest that this process might play an important role in flow filtering. The fact that modeled flows adjust to new equilibria over tens of kilometers suggests that they are less sensitive to upstream flow conditions in longer channels. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114379
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Sciences, Stanford University, Stanford, CA, United States; Statoil, Austin, TX, United States; Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, United States
Recommended Citation:
Traer M.M.,Fildani A.,Fringer O.,et al. Turbidity Current Dynamics: 2. Simulating Flow Evolution Toward Equilibrium in Idealized Channels[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(3)