Accession Number : AD0453271

Title :   PRESSURE TRANSMISSION FROM AN EXPLOSION IN A LIQUID LAYER OVERLYING A POROUS SOLID, AND RELATED PROBLEMS.

Descriptive Note : Interim technical rept.,

Corporate Author : CAMBRIDGE ACOUSTICAL ASSOCIATES INC MA

Personal Author(s) : Eichler, Ewald ; Rattayya, Jasti V.

Report Date : JUL 1964

Pagination or Media Count : 48

Abstract : A study is made of the pressure field of an underwater explosion as modified by bottom and surface reflection. Linear theory is applied to a fluid layer overlying a porous fluid-saturated solid half-space. The porous medium supports three types of free waves. The combination of inertial and viscous coupling between its components makes it dispersive, and hence limits the application of Cagniard's method. Explicit long-range approximations are presented for the pressure and for its Fourier transform. Available geophysical parameters are scarce. Data for a globigerina ooze are supplemented to give two complete sets of parameters for a porous solid ocean bottom. Reflection coefficients computed therefrom are generally lower than for a simpler liquid or solid bottom. (Author)

Descriptors :   (*UNDERWATER EXPLOSIONS, PRESSURE), POROUS MATERIALS, SOLIDS, LIQUIDS, OCEAN BOTTOM TOPOGRAPHY, OCEAN WAVES, PROPAGATION, SEISMOLOGY, ECHO RANGING, LINEAR SYSTEMS, OCEAN MODELS, REFLECTION, FOURIER ANALYSIS, INTEGRAL TRANSFORMS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE