Time-evolution modelling of seafloor scatter: Part 1: Theory
A time-series model for acoustic seafloor backscattering is described.The method expresses analytically the elementary time-backscatteredresponse of every seafloor surface and every seafloor volume infinitesimal element. For chosen geometric, acoustical and acquisition parameters, they aresummed to produce in the time-domain a realization of the reverberated time pressure field received at the source. The approach is based on the Kirchhoff approximation for the seafloor interface backscattering and on the Small Perturbation theory for the seafloor volume. It only accounts for single backscattering mechanisms of the compressional wave with the seafloor. The model is implemented using calculated height fields for the water-sediment interface and the distributed seafloor volume inhomogeneities. The analytical description of the model and its limitations is described in this report.
Pace, Nicholas G.