Abstract
Experimental values of the coefficient of drag at the threshold of motion were determined for spheres resting on a permeable bottom during oscillatory wave motion. The tests were performed in a wave tank in which a model trench was used to simulate the back fill and cover layers of a buried pipe line. The tests were conducted on model cover layers consisting of spheres of various sizes and specific weights. The ambient velocity and acceleration were computed for the wave conditions and phase angle at the instant of incipient motion. The drag coefficient was determined after assuming that a theoretical nonconvective solution for the coefficient of inertia could be used to estimate the inertial force. The data obtained from the tests may be used to estimate the size of stable stone armoring necessary to protect buried pipelines and marine foundations.
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