The research of scalar-vector structure of sound field in shallow water

Abstract

The paper presents the results of experimental studies of the sound field in shallow sea. The experiment was carried out in the Posyet Bay (Sea of Japan) in 2014. Towed array was used as a source of sound signals and reception was fulfilled by a combined 4-channel receiver. The investigated range of operating frequency was 83-243 Hz. The measurements were performed for different depths of towing sound source and various receiving horizons. The purpose of the experiment was to study the space-frequency structure of the sound field in shallow water in the scalar-vector description of its main characteristics. The generalized theory of wave propagation in layered media was used to explain the experimental results. The measurement results indicate essential irregularity of the sound field in the horizontal plane and the presence of a significant level of reverberation noise. These features are related to the location of the receiving system and towing line of the sound signal source close to the coastal wedge. The measured noise field contains an anisotropic component connected with the man-caused sources of noise interference in Troicy Bay.