An Experimental Study of the Reverse Percolation Lofting Process in a Sand Medium.
WHITTAKER CORP NORTH HOLLYWOOD CA SHOCK HYDRODYNAMICS DIV
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A vertical shock tube was used to approximate the time dependent overpressure at 1 km from a nominal 1 Mt source, in order to study the lofting response of a porous sand medium, arising from the gas flow into and out of the medium. The basic shock wave form applied to the sand surface in the vertical shock tube, had a peak value of 100 psig, and a positive duration of approximately 0.75 seconds. The corresponding Brode function has an estimated positive duration of 1.1 sec, but was closely approximated by the experimental shock over the first 0.4 microseconds. Modified author abstract
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