Open boundary for generation of waves resulting from landslide

Dear DualSPHysics users,

I am working on a landslide case in which a rigid body slides down a ramp and hits the water, creating waves. I would like to define a open boundary to prevent reflecting waves back into the domain. In the examples of inlet and outlets , waves and fluid mass are created on the boundaries. In the particular case, where the waves are generated by sliding an object, can we apply an open boundary as shown in the figure?

I greatly appreciate your idea and assistance.

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