DOI: 10.1002/2017JF004200
Scopus记录号: 2-s2.0-85043528271
论文题名: Turbidity Current Dynamics: 1. Model Formulation and Identification of Flow Equilibrium Conditions Resulting From Flow Stripping and Overspill
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: 501
结束页码: 519
语种: 英语
英文关键词: channel levee
; flow stripping
; overspill
; submarine
; turbidity current
Scopus关键词: entrainment
; levee
; one-dimensional modeling
; Richardson number
; submarine channel
英文摘要: This study expands the widely used one-dimensional, four-equation model for turbidity currents to account for mass, momentum, and energy sinks associated with flow stripping and overspill processes acting upon the turbidity current suspension cloud. The suspension cloud is defined as any portion of the flow extending above the channel levees. The expanded model allows steady turbidity currents to evolve to a uniform, or equilibrium, state where mass, momentum, and energy gained through sediment and clear-water entrainment processes are balanced by the mass, momentum, and energy lost to flow stripping and overspill. We perform a sensitivity analysis of the expanded model to assess how changes in channel (e.g., slope, channel height, width, bed friction, and radius of curvature) and flow (e.g., sediment grain size, suspension cloud concentration, and turbulence) properties affect the equilibrium flow conditions. By varying the model inputs from half to double their base case values, we find that the equilibrium values can change by up to a factor of 2. We find that the equilibrium conditions, including the flow Richardson number, were generally most sensitive to changes in slope, channel height, grain size, and suspension cloud concentration. Additionally, we identify model parameter space where Richardson subcritical equilibrium flow is possible. The fact that turbidity currents can attain equilibrium, and particularly subcritical equilibrium, might help elucidate the long turbidity current runout distances on low slopes inferred from extensive submarine channel levee systems. ©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/114326
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: 1. Model Formulation and Identification of Flow Equilibrium Conditions Resulting From Flow Stripping and Overspill[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(3)