The scattering of sound from the sea surface is important for the operation of underwater sonar and underwater acoustic communications systems. Studies of low to mid-frequency surface reverberation have a long history, but studies of very high frequency (>300 kHz) surface scattering in the literature are rare. The physics of very high frequency (VHF) scattering is expected to be strongly depend...

The development of new concurrent detection and classification concepts has the potential of dramatically increasing the coverage rate of shallow water mine countermeasures, in particular for buried targets. The GOATS'98 experiment had as one of its main objectives to explore the possibility of basing such a concept on the measurement of classifying features of the 3-D acoustic scattering by su...

Wave propagation in disordered (random) media is the underlying theme. Many types of wave propagation problems can most conveniently be analyzed in this framework. Acoustic waves in the earth's crust and shallow water (or surface gravity) waves are two examples. The interaction of sound waves with the heterogeneities in the earth's crust is important in seismology. The interaction of surface gr...

This paper concerns with the modeling and construction of a fifth order method for two dimensional acoustic wave equation in heterogenous media. The method is based on a standard discretization of the problem on smooth regions and a nonstandard method for nonsmooth regions. The construction of the nonstandard method is based on the special treatment of the interface using suitable jump conditio...

Time-harmonic acoustic waves in an ocean of finite height are modeled by the Helmholtz equation inside a layer with suitable boundary conditions. Scattering in this geometry features phenomena unknown in free space: resonances might occur at special frequencies and wave fields consist of partly evanescent modes. Inverse scattering in waveguides hence needs to cope with energy loss and limited a...