Estimating Turbulence and Shear Stress under Regular Waves from ADV Data

Zheng Xiao; Chao Shen; Zhi Xin Guan; Yuan Li; Rui Min Ji

doi:10.4028/www.scientific.net/AMM.212-213.1083

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 212-213Estimating Turbulence and Shear Stress under...

Estimating Turbulence and Shear Stress under Regular Waves from ADV Data

Abstract:

The boundary layer flow determines the bottom shear stresses, which is key point for sediment transport and thereby the evolution of coastal morphology. The structure of the bottom boundary layer in coastal seas has been of interest to oceanographers for many years. In the paper Acoustic Doppler velocimeter (ADV) technique is applied to measure the bottom boundary layer under cnoidal waves in a laboratory flume with 40-m-long, 0.5-m-wide, and 0.8-m-deep.. Based on the high frequency turbulence signal collected, statistic parameters of cnoidal wave flow are calculated, compared and analyzed. The turbulent structure over plain bed and sand ripples bed are carefully studied. The turbulence intensity of near-bed velocities changes along depth of several phases in a period is analyzed. Turbulent Kinetic Energy Method (TKE Method) is used to estimate near-bed shear stress on flat and slope.

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Periodical:

Applied Mechanics and Materials (Volumes 212-213)

Pages:

1083-1091

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.212-213.1083

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Online since:

October 2012

Authors:

Zheng Xiao, Chao Shen, Zhi Xin Guan, Yuan Li, Rui Min Ji

Keywords:

ADV, Bottom Boundary Layer, Regular Wave, Shear Stress

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