Accession Number : AD0331393
Title : SMALL SCALE STUDIES OF REFRACTION OF UNDERWATER SHOCK WAVES (U)
Descriptive Note : Summary rept.
Corporate Author : NEW HAMPSHIRE UNIV DURHAM
Personal Author(s) : HALL, H.H. ; CLARK, D.G.
Report Date : DEC 1961
Pagination or Media Count : 1
Abstract : Laboratory scale studies of the refraction of underwater shock waves by thermal gradients are described. The ratios of peak pressures to those in isovelocity water showed a marked decrease in the attenuation zone, while ratios of impulse appear to be less affected by refraction. The effects of small variations of the various characteristics of a velocity profile upon pulse duration could be predicted. These effects were consistent with the scaling law. In the attenuation region, wave shapes have gradually rising fronts, and rounded peaks, indicating a loss of high frequency components in this region. These wave fronts can be characterized by cut off wave lengths, proportional to their time constants, which appear to reach maximum length when passing from the surface downward at about the middle of the attenuation zone. (Author)
Descriptors : *REFRACTION, *SHOCK WAVES, *THERMAL CONDUCTIVITY, *UNDERWATER SOUND, .
Subject Categories : Physical and Dynamic Oceanography
Distribution Statement : APPROVED FOR PUBLIC RELEASE