The Features of Formation of the Spatial Structure of the Vector-Scalar Sound Field in the shelf zone of the Sea of Japan

Abstract

In this paper we discuss the findings of experimental studies on spatial structures of the acoustic vector-scalar field that were generated with the help of a towed low frequency sound source in a shallow water area in the Sea of Japan. The emission of the 134 Hz tone signal was provided by towing the acoustic source. The depth of towing was 20 meters for all tracks in both experiments with a maximum distance between the source and the combined receiver (CR) of 10 kilometers. The CR consists of an omnidirectional hydrophone and three perpendicular vector receivers of acceleration oscillatory vectors. Special emphasis was given to the study of formation of vector and scalar fields interference structure under monitorable vertical distribution of temperature and salinity in water column. The features of interference structure at different tracks are described. Of great interest are the results of comparison of the horizontal and vertical field components of the vector-scalar fields, which made it possible to identify significant (hundreds of meters) shifts of the minima and maxima of the signals in the PXY channels relative to the Z channel on some tacks. The possibility of practical implementation of the findings is discussed.