Abstract
The residual current that is the remainder in filtering out the periodic tidal current variations from the current observed can efficiently be computed without tidal computation resorting to the residual current equations with tidal stress. This paper deals with the problem of evaluation method of the coefficient of kinematic eddy viscosity involved in these equations, through a case study in the Bungo Channel, the Seto Inland Sea. The residual current handled is limited to that resulting from non-linearity of tidal current, i.e., tide-induced residual current. Moreover, flow field is assumed barotropic, by which it is permitted to be based on the horizontally two-dimensional equations. Consequently it is demonstrated that in order to correctly reproduce such a residual current over the whole domain of interest, the coefficient should be spatially variable and then expressed in terms of the square of the amplitude of tidal current variations applying the mixinglength theory.
