A three-dimentional model of the northeast East China Sea, with application to the M₂ current field

A simple three-dimensional tidal model is used to examine the M₂ tidal current distribution in a northeastern part of the East China Sea, especially the vertical variation of the current in the region. Computed M₂ current is compared with observations available and found to be in good agreement.
Main features of the calculating method in this study are:(1) Vertical variation of the tidal current is taken as a funetion of the depth-mean velocity:(2) the method is applicable to a variety of the vertical eddy viscosities; (3) it has a fine vertical resolution, especially near the sea bootom. So, this method not only enables us to get a steady state solution easily but also depicts effects of the friction on the vertical variation of the current much better.