The residual flow in a tidal stream

Summary Consideration is given to the problem of the boundary conditions that must be specified when calculating the residual flow in a tidal stream. A particular example is discussed that relates to the tidal flow adjacent to a straight coastline. It is shown that the long-shore mean volume flux of water must be prescribed in order to determine the corresponding residual flow. A theory is given that relates to flows in water of non-uniform depth, and by considering a particular case, it is shown that this may have a profound effect upon the structure of the residual current system.