Water wave diffraction by a surface strip

The two-dimensional problem of wave diffraction by a strip of arbitrary width is investigated here in the context of linearized theory of water waves by reducing it to a pair of Carleman-type singular integral equations. These integral equations have been solved earlier by an iterative process which is valid only for a suffciently wide strip. A new method is described here by which solutions of these integral equations are determined by solving a set of four Fredholm integral equations of the second kind, and the process is valid for a strip of arbitrary width. Numerical solutions of these Fredholm integral equations are utilized to obtain fairly accurate numerical estimates for the reflection and transmission coeffcients. Previous numerical results for a wide strip are recovered from the present analysis. Additional results for the reflection coeffcient are presented graphically for moderate values of the strip width which exhibit a less oscillatory nature of the curve than the case of a wide strip