How to determine the moment caused only by the horizontal wave load?
 

Hello all,

I am modelling the impact of a caisson (height=18 m) completely submerged at water depths of 40 m using diffraction theory (AQWA/HYDROD). I want to determine the moment caused by just the horizontal load in order to obtain the arm of this load.

Is there any way to remove the moments caused by the vertical loads?

Thank you very much for your time