Numerical and Imitative Simulation of Sound Signal and Noise Propagation in Shallow Sea

摘要

On the basis of the exact wave approach and under the using of the imbedding method ideas the correspondent software was developed and calculations of acoustical fields in the shallow sea from monochromatic source, radiating in the middle frequencies 500 - 1000 Hz, were carried out. We investigate the influence of real factors presenting in the coastal ocean area on the possibilities of a reception of useful signal from the source. Namely these are the antiwaveguide sound speed depth stratification, having the features of the thermocline origin, the presence of a bottom, having some complex impedance structure, finally the presence of a complex field of the underwater acoustical noise. For the last factor the possibilities of imitative simulation are considered. Sound field simulation is carried out on an example of the scalar and vectorial power characteristic behaviour, namely these are the acoustical energy (scalar intensity) and the sound power flux density (vector). The considered models and calculation results can be useful for the prognosis of results of experimental measurements in a coastal ocean area.