PRESSURE TRANSMISSION FROM AN EXPLOSION IN A LIQUID LAYER OVERLYING A POROUS SOLID, AND RELATED PROBLEMS.
Interim technical rept.,
CAMBRIDGE ACOUSTICAL ASSOCIATES INC MA
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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 Cagniards 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