Douglas M. Photiadis
Naval Res. Lab., Washington, DC 20375-5000
The scattered field from an irregularly ribbed fluid-loaded plate is ``measured'' using numerical simulations. The diffuse field scattered by the irregularity exhibits strong coherent features in the far-field scattering pattern associated with phase matching to locally propagating Bloch waves on the structure. These features are also apparent in the scattering from finite periodic arrays, but are strongly enhanced by irregularity. Some examples of the behavior of the system are presented and the scaling of the cross section with the number of scatterers and irregularity is determined.