Accession Number : AD0424974

Title :   A SOUND TRANSMISSION EXPERIMENT IN THE LOWER WEST PASSAGE OF NARRAGANSETT BAY,

Corporate Author : RHODE ISLAND UNIV KINGSTON NARRAGANSETT MARINE LAB

Personal Author(s) : Dietz,Frank T. ; Gilbert,Kent

Report Date : NOV 1963

Pagination or Media Count : 26

Abstract : On December 28, 1962, an underwater sound transmission experiment was conducted, using explosive sound sources, along a 4300-m range in the lower West Passage of Narragansett Bay, Rhode Island. The purpose of the experiment was to determine the sound transmission characteristics as functions of frequency between 18.7 and 8000 cps. Under the prevailing conditions, the best transmission was found to occur in the frequency band from 600 to 2400 cps for sources detonated at both mid-depth and near the surface. Sound transmission characteristics were related to ambient noise measurements made in the same area. Poor sound transmission below the normal mode cutoff frequency may partially explain the absence of an ambient noise wind dependence below 150 cps. Good transmission in the 600 2400 cps band is related to the observed high sensitivity of the ambient noise spectrum to changes in wind speed in this region. (Author)

Descriptors :   (*UNDERWATER SOUND SIGNALS, SOUND TRANSMISSION), ATTENUATION, INTENSITY, FREQUENCY, EXPLOSIONS, SEA WATER, TEMPERATURE, MEASUREMENT, INSTRUMENTATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE