Accession Number : AD0828264

Title :   SEASONAL ECHO SOUNDER CORRECTIONS FOR MARSDEN SQUARE 130.

Descriptive Note : Informal rept.,

Corporate Author : NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS

Personal Author(s) : Bialek, Eugene L.

Report Date : NOV 1967

Pagination or Media Count : 22

Abstract : Echo sounders used in this country are calibrated for a sound speed of 4,880 feet per second. The actual speed of sound in water varies with temperature, pressure, and salinity, but in the ocean it is nearly always faster than the calibration speed. The error thus induced is always such as to give an echo sounder reading less than the actual water depth. In certain precise work it is necessary to correct the echo sounder readings for actual sound speed under prevailing conditions. The purpose of the study is to examine the calculated seasonal echo sounder corrections within Marsden Square 130. (Author)

Descriptors :   *ECHO RANGING), (*DEPTH INDICATORS, UNDERWATER SOUND, VELOCITY, OCEANS, DEEP WATER, PERIODIC VARIATIONS, OCEAN CURRENTS, LEAST SQUARES METHOD, CALIBRATION, MAPS, CORRECTIONS.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE