Method of Studying Modulation Effects of Wind and Swell Waves on Tidal and Seiche Oscillations

Abstract

This paper describes a method for identifying modulation effects caused by the interaction of waves with different frequencies based on regression analysis. We present examples of its application on experimental data obtained using high-precision laser interference instruments. Using this method, we illustrate and describe the nonlinearity of the change in the period of wind waves that are associated with wave processes of lower frequencies—12- and 24-h tides and seiches. Based on data analysis, we present several basic types of modulation that are characteristic of the interaction of wind and swell waves on seiche oscillations, with the help of which we can explain some peculiarities of change in the process spectrum of these waves.

Verification of Data from Supersensitive Detector of Hydrosphere Pressure Variations

“…This system was used in fundamental and applied research intended to obtain unique results in the wide frequency and dynamic ranges. In-situ data obtained from this instrument made it possible to study the eigen oscillations of the bays within Posyet Bay of the Sea of Japan [ 2 ], the interaction of wind waves with lower-frequency sea waves [ 3 ], the mechanisms of nonlinear hydrophysical disturbances’ occurrence in the range of gravity and infragravity sea waves [ 4 ], and many other natural phenomena.…”