TECHNICAL PAPERS
Mar 1, 1998

Initial Motion of Sediment in Oscillatory Flow

Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 124, Issue 2

Abstract

A new model is developed to study the initial motion of sediment in oscillatory flow over a flat bottom on the basis of available experimental data. It is found that the initial motion of sediment in oscillatory flow is uniquely defined by the simple model of A/d=KA2ω/ν+B, where A= semiexcursion of wave orbital motion near the bed; ω= angular frequency; d= grain diameter; ν= kinematic viscosity; and K and B= dimensionless coefficients determined by the immersed sediment weight. For a given sediment, the onset velocity derived from the model is found to initially increase with the wave period T and then approach a constant. A practical formula is also presented to calculate the onset velocity of sediment in the coastal zone.

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Go to Journal of Waterway, Port, Coastal, and Ocean Engineering
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 124Issue 2March 1998
Pages: 68 - 72

History

Published online: Mar 1, 1998
Published in print: Mar 1998

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Authors

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Zai-Jin You
Sr. Res. Sci., Marine and Freshwater Resour. Inst., P.O. Box 114, Queenscliff Victoria 3225, Australia, e-mail: [email protected]

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