CMS-Flow:Sediment Fall Velocity

Sediment Fall Velocity

The sediment fall velocity may be user-specified or is calculated using the formula by Soulsby (1997):

$\omega _{s}={\frac {v}{d}}\left[(10.36^{2}+1.049d_{*}^{3})^{1/2}-10.36\right]$

(1)

where:

v = kinematic viscosity [m²/s]

d = grain size [m]

d_* = dimensionless grain size [-].

The dimensionless grain size is given by

$d_{*}=d\left[{\frac {(s-1)g}{v^{2}}}\right]^{1/3}$

(2)

where:

s = sediment specific gravity or relative density [-]

g = gravitational constant (9.81 m/s²).