Siew and Hurley (1977) provided the linear solution for the transmitted and reflected waves in the presence of a submerged plate in shallow water. They, however, appeared to not be interested in estimating the forces. Later, Patarapanich (1984a) used the linear potential flow solution provided by Siew and Hurley (1977) and integrated the pressure on the submerged plate to obtain the linear forces when the water is shallow and waves are long.
We also used the Green-function method to obtain the linear exciting forces on the plate. We consider a train of regular waves of frequency ω that diffract due to the presence of the submerged plate. The waves are assumed to be linear and long crested. The fluid is assumed to be incompressible and inviscid and is undergoing irrotational flow in finite water. The fluid motion is assumed small, and hence the total velocity potential ϕ, which is a function of the spatial coordinates and time, can be written as