# Modeling Turbulent Mixing and Sand Distribution in the Bottom Boundary Layer

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*by*Rafik Absi, EBI, 32 Bd du Port, 95094 Cergy-Pontoise cedex, France, r.absi@ebi-edu.com,

**Document Type:**Proceeding Paper

**Part of:**Coastal Dynamics 2005: State of the Practice

**Abstract:**For the calculation of turbulent mixing in the bottom boundary layer, we present simple analytical tools for the mixing velocity w

_{m}and the mixing length l

_{m}. Based on observations of turbulence intensity measurements, the mixing velocity w

_{m}is represented by an exponential function decaying with

_{m1}obtained from the

_{m2}based on von Kármán's similarity hypothesis. These analytical tools were used in the finite-mixing-length model of Nielsen and Teakle. The modeling of time-mean sediment concentration profiles

_{m2}which increases the upward convexity of C(z), the first equation l

_{m1}increases the upward concavity of

**Subject Headings:**Soil mixing | Boundary layers | Sandy soils | Sand (material) | Suspended sediment | Kinetics | Light rail transit | Turbulent flow | Turbulence | Decision support systems |

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