Characteristics of Resuspension,Settling and Diffusion of Particulate Matter in a Water Column |
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Authors: | Michael?Belinsky Hillel?Rubin Email author" target="_blank">Yehuda?AgnonEmail author Eliezer?Kit Joseph?F?Atkinson |
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Institution: | (1) Department of Civil and Environmental Engineering, Technion – Israel Institute of Technology, Haifa, 32000, Israel;(2) Department of Fluid Mechanics and Heat Transfer, Tel-Aviv University, Tel-Aviv, 69978, Israel;(3) Department of Civil, Structural and Environmental Engineering, University at Buffalo, Buffalo, NY 14260, USA |
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Abstract: | Experiments were conducted in order to characterize the distributions of concentrations of suspended particulate matter (SPM)
in water columns of lakes and reservoirs. The experiments, in a reduced model of the water column, used a set of oscillating
grids. Runs were done with particles denser than water as well as with light particles. The results were in good agreement
with analytical solutions for steady-state, and non-steady-state conditions. An approximate analytical solution was derived
and found to be in agreement with the full solution. The threshold for resuspension was measured, and characterized in terms
of a modified Shields parameter, which is appropriate to a zero-shear environment. All experiments showed that the distribution
of SPM exhibited a layer near the bottom that is thought to be analogous to the benthic nepheloid layer (BNL) observed in
larger lakes. The thickness of the nepheloid layer increases with the turbulence intensity. |
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Keywords: | Benthic nepheloid layer lakes and reservoirs modified Shields parameter multi-grid induced turbulence sediment transport |
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