沿岸漁場における背景雑音の解析

概要

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A method was developed in order to establish an accurate way of analyzing underwater background noise in the coastal fishing grounds. Three hydrophones were placed on the seabed in a triangular pattern. Underwater sounds generated by the research vessels were recorded on a data-recorder and then analyzed at the laboratory of Hokkaido University. Power spectra were estimated from these data. Dominant sound frequencies in these spectra were identified, as well as their underwater directional source. Where the sea is shallow for some distance from shore, the energy decreasing rate of ship noise which traveled underwater was observed to vary according to different sound frequencies. The method of the hydrophone placement used in this study also aided in detecting sound direction. By applying the process of numerical filtering, it was possible to detect the direction of the underwater sound, as well as express its characteristics.
日本水産學會の論文