A NUMERICAL STUDY ON PROPAGATION OF NONLINEAR INTERNAL WAVES

Internal waves in a two-layer system are simulated using a set of nonlinear internal-wave equations, which was derived on the basis Of a variational principle without any assumptions concerning wave nonlinearity and dispersion In the cases where long internal waves reflect in a tank, interface displacements obtained by the proposed model with more than two vertically distributed functions of velocity potential are in harmony with those by the Boussinesq-type model. as well as the existing experimental data especially in the wave number In the intermediate-wave case, the present model shows different results from those through the Boussinesq-type model, which should not be applied to this case without enough consideration of the wave dispersion Internal waves propagating over a submerged breakwater are also simulated, where the vertical distribution of horizontal velocity below a crest is remarkably distributed when it starts disintegration after passing over the shoulder