Characteristics of Shear Stratified Flows in the Conditions of the Sea of Japan Shelf Based on in-situ Measurements in 2022

The results of analyzing the in-situ data of shear stratified flow measurements on the shelf of the Sea of Japan are presented. Study of critical zones and layers is performed in terms of the dimensionless Froude and Richardson numbers. It is shown that during the propagation of high-intensity internal bores, sufficiently long (up to several hours) time intervals occur, which are characterized by a supercritical Froude regime, when active generation of short-period internal waves of large amplitude is predicted and takes place. The statistics of the Richardson numbers shows that with the lower bound on the probability in the layer of flow measurements during the observation period, shear instability can occur in 15% of cases and can be preserved in 44% of cases.