124 resultados para Shock Tunnel


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National Highway Traffic Safety Administration, Washington, D.C.

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Vita.

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"This work has been supported by the National Science Foundation under Grant G-1221"

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Mode of access: Internet.

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"This work was supported in part by the Office of Naval Research under Contract No. Nonr-1834(15)"

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"Issuance Date: May 24, 1965"--cover ; "December 1964"--title page

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The development of sand ripples in an oscillatory-flow water tunnel was observed in 104 laboratory experiments approximating conditions at the seabed under steady progressive surface waves. The period, T, and amplitude, a, of the water motion were varied over wide ranges. Three quartz sands were used, with mean grain diameters, D = 0.55, 0.21, and 0.18 millimeter. In 24 experiments, with the bed initially leveled, T was reduced until ripples appeared, and their development to final equilibrium form was observed without further change in T. The remaining 80 experiments investigated the response of previously established bed forms to changes in T or a or both. The ripple length, lambda, and height, eta, were measured from photos, except when bed forms were three dimensional.

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"DA-49-193-MD-2229."

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Caption title.

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"PNE-112F(Pt. II); Nuclear Explosions and peaceful applications."