Processing and comparing of underwater ambient noise during spring and neap tide

Underwater background noise consists of a mixture of physical and biological noise that are not directly of interest of the study. Physical noise includes for example surf، wind، turbulence، wave breaking، rain، sand motion، earthquakes and anthropogenic noise. Biological noise includes the calls of marine mammals، crustaceans، fish and all other marine life sounds. With the growing marine renewable industry، notably Tidal Stream Turbine project، underwater background noise mechanisms in shallow water is starting to be of interest. Thus before assessing the turbine noise، it is thus essential to monitor underwater background noise of a proposed site at different tide (spring، neap)، season، at different sea level during the ebb and the flood. In this research southern port of our country are compared for use of this technology and principles of ambient noise measuring during spring and neap tide are introduced. Finally some predictions of results and comparisons between measured and analyzed noise in different frequency band are presented.