You can define the waves in your calculations as:
· No waves
· Wave field from SW simulation
If waves are included you need to specify some additional parameters.
Liquefaction is a weakening of the sediment due to pore-pressure flocculation caused by the waves.
To include this you must specify a liquefaction factor.
Generally, the inclusion of liquefaction will increase erosion.
You must also specify the minimum water depth for waves. This is the water depth below which the pure current solution for the bed shear stress will be used instead of the wave-current solution.
It is possible to select which formulation to use when calculating the bed shear stress for combined wave-current action.
The solution can be a parameterised version by Soulsby et. al. (1993), calculating the mean shear stress or the maximum shear stress, respectively.
It is also possible to choose an approach by Fredsøe (1981), where the bed shear stress is found by the maximum value of a pure current solution and a solution that considers a modified bed roughness due to the waves.