Studying Resonance Oscillations in the Eastern Part of the Posyet Bay

The field experiment with the installation of autonomous pressure gages in the Troitsa and Vityaz’ bays was held for studying the specific features of free surface oscillations in the Posyet Bay (the Sea of Japan). The interpretation and joint analysis of measurement data allowed obtaining the datasets of spatiotemporal parameters for free oscillations calculated using the spectral-difference model and for forced oscillations in the form of the response to the forcing with the periods of 10–50 minutes in the numerical model of shallow water with the difference approximation on the irregular triangular grid. The position of peaks on the model resonance curves and the values of frequencies of free oscillations are consistent with the position of clearly pronounced peaks of the energy spectrum from field data. This indicates the possibility of significant resonance enhancement of the amplitude of oscillations by periodic wind effects and incoming wave effects.