Sediment bed destabilization by an isolated vortex:an experimental approach
作者机构：Institut PprimeCNRS-Universitéde Poitiers-ISAE-ENSMA-UPR 3346PoitiersFrance
出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)
年 卷 期：2021年第33卷第2期
页 面：370-385页
核心收录：
学科分类：08[工学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程]
主 题：Sediment plume isolated vortex stereo-correlation particle image velocimetry(PIV) bedform dynamics
摘 要：The destabilization of an erodible sediment bed by a reproducible impulsive phenomenon is studied *** this,a specific setup is designed to produce a well-controlled isolated vortex,advected over a uniform sand *** image velocimetry(PIV)measurements are performed to get fluid flow information;suspended particles images are also recorded.A new measurement technique,based on a stereo-correlation method,provides a precise reconstruction of the bedform morphology over *** turbulent structures(namely sweep events)are evidenced in a near-wall region,where particles are mainly *** sediment plume follows the vortex:in particular,the upward velocity inside maintains the suspension ***,the dispersion process seems to be not dependent on the vortex ***,the bed morphology is investigated:a scour hole is dug as the vortex hits the granular *** dynamics is described by a typical scour law,even if the initial perturbation is *** area,where the particles settled,can be observed:it behaves like a ripple,with a logarithmic growth of its *** deposition region has a specific geometry,studied here by a Fourier contour ***,a pickup rate is also derived from the morphological data:it appears independent of the vortex and bedform features.
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