The eddy diffusivity coefficients for momentum and heat fluxes are defined as follows,
2.
The linear approximation, the eddy diffusivity equation with an eddy diffusion coefficient K, allowed Ekman to obtain a simple logarithmic spiral solution.
3.
Fortunately there exists a closure approximation in introducing the concept of eddy diffusivity and its statistical approximations for the random concentration and velocity components from turbulent mixing.
4.
In this approach, the diffusion rate at each pressure level is parameterized by a quantity known as the "'eddy diffusion coefficient "', K ( also sometimes called "'eddy diffusivity "', with units of m 2 s " 1 ).
5.
Here, z is the elevation above the bed, c _ s is the concentration of suspended sediment at that elevation, h is the flow depth, P is the Rouse number, and \ alpha relates the eddy viscosity for momentum K _ m to the eddy diffusivity for sediment, which is approximately equal to one.
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