CMS-Flow:Bottom Friction

Bottom Friction

Flow without Waves

In the situation without waves, the bottom shear stress is calculated based on the quadratic formula

     $\tau _{m}=\tau _{c}=\rho c_{b}|U|U$

where $c_{b}$ is the bottom friction coefficient, $U$ is the depth-averaged current velocity.

Flow with Waves

In the case with waves, the bottom friction is calculated as

     $\tau _{m}=\lambda \tau _{c}$