Accession Number : AD0742825

Title :   Spectral Level of Explosive Charges Fired Very Near the Surface.

Descriptive Note : Technical rept.,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS

Personal Author(s) : McElroy,Paul T.

Report Date : MAY 1972

Pagination or Media Count : 29

Abstract : The spectral levels of 85 one-half pound blocks of TNT fired at the shallow depth of 18 inch have been determined in 26 contiguoug one-third octave bands extending from 112 Hz to 35.4 kHz. Measurements were made in sea states varying from 0 to 5. Mean levels, standard deviations and standard deviations of the mean are given. The spectra deviate markedly from the expected spectra of a shock pulse alone. A theoretical model incorporating a direct signal and a surface reflection truncated by cavitation, gives a reasonable fit to the experimental curves particularly after cavitation pressure is adjusted as a parameter to improve the match. (Author)

Descriptors :   (*UNDERWATER EXPLOSIONS, POWER SPECTRA), EXPLOSIONS, SHALLOW WATER, SOUND, OCEAN WAVES, SHOCK WAVES, CAVITATION, EXPERIMENTAL DATA

Subject Categories : Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE