A second-order coupling model is extended to consider 3D nonlinear wave propagation in a complete coupling numerical and physical wave basin. The first- and second-order solutions for the wave paddle position are obtained by combining the second order coupling theory with the nonlinear shallow water wave generation theory, in which the wave direction, non-uniformity and nonlinearity along with the numerical-physical-boundary can be completely included. Several comparisons between numerical and physical waves have been conducted. Comparisons of the proposed second order coupling model are also made to the existing first order coupling model. In all experiments, the results support the proposed model, which also show that it is capable of simultaneously processing large-scale numerical wave propagation with physical model including local complex wave phenomena.

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