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In this paper we discuss a theoretical model for the interfacial profiles ofprogressive non-linear waves which result from introducing a triangularobstacle, of finite height, attached to the bottom below the flow of astratified, ideal, two layer fluid, bounded from above by a rigid boundary. Thederived equations are solved by using a nonlinear perturbation method. Thedependence of the interfacial profile on the triangular obstacle size, as wellas its dependence on some flow parameters, such as the ratios of depths anddensities of the two fluids, have been studied

Progressive Internal Gravity Waves With Bounded Upper Surface Climbing a Triangular Obstacle