This research focuses on the development of a set of two-dimensional boundary
conditions for specific governing equations. The governing equations are existing Boussinesqtype
equations which is capable of simulating wave-current interaction. The present boundary
conditions consist of for waves only case and for currents only case. To simulate wave-current
interaction, the two kinds of the present boundary conditions are then combined. A numerical
model based on both the existing governing equations and the present boundary conditions is
applied to simulation of currents only and of wave-current interaction propagating over a basin
with a submerged shoal. The results of the numerical model show that the present boundary
conditions go well with the existing Boussinesq-type wave-current interaction equations.