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Microstructure of Cohesive Sediment Suspensions

by Panagiotis D. Scarlatos, South Florida Water Management, District, United States,
Ashish J. Mehta, South Florida Water Management, District, United States,



Document Type: Proceeding Paper

Part of: Soil Properties Evaluation from Centrifugal Models and Field Performance

Abstract:

In a shear flow field suspended fine sediments under relatively low concentrations and stable stratification conditions develop a step-wise profile. This is due to internal wave instability and turbulent mixing of the suspended particles. A mathematical model has been presented for simulation of that physical process in a horizontally homogeneous and steady-state system. The model is based on the nonlinear vertical diffusion equation. Both velocity and density gradients are incorporated through the eddy diffusivity coefficient. The solution is iterative with quadratic convergence. An example is given for microstructure development in a stably stratified suspended sediment system subject to shear based on a von Karman's logarithmic velocity profile.

Subject Headings: Suspended sediment | Shear flow | Fluid flow | Microstructure | Mathematical models | Fluid velocity | Diffusion (fluid)

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