THE MODIFIED MILD-SLOPE EQUATION

A modified version of the mild-slope equation is derived and its predi ctions of wave scattering by two-dimensional topography compared with those of other equations and with experimental data. In particular, th e modified mild-slope equation is shown to be capable of describing kn own scattering properties of singly and doubly periodic ripple beds, f or which the mild-slope equation fails. The new equation compares favo urably with other models of scattering which improve on the mild-slope equation, in that it is widely applicable and computationally cheap.