Abstract: In regions of internal waves, topography is commonly an important factor for internal waves’ generation, propagation and evolution. Based on incompressible primitive Navier-Stokes equations, a non-hydrostatic oceanic hydrodynamics model is employed to study internal solitary waves (ISWs). Generation and evolution processes of nonlinear internal waves are simulated in the numerical model forced by barotropic tide. Using the simulation results, topological structure changes of single-ridge terrain on the generation and propagation of solitary waves are presented. According to the simulations of various topographic depths and extended parameters, analysis is done in terms of arrival time and intensity of ISWs. Following that, an “L-depression” structure would appear on the opposite side of the ridge before ISW generation is proposed, and a -“accumulation” and “releasing” mechanism on energy with the “L-depression” structure is also indicated.

Key words: internal wave, single ridge, non-hydrostatic approximation, depression