Incipient motion on a horizontal granular bed in non-breaking water waves |
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| Authors: | Miguel A Losada JoséM Desiré |
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| Institution: | Departamente de Puertos y Obras Maritimas, E.T.S. Ingenieros de Caminos, Canales y Puertos, University of Santander, Santander, Spain |
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| Abstract: | A criterion for initiation of sediment movement on a horizontal bed under non-breaking waves is established. Bagnold's sediment transport model is used. The dissipation rate of energy has been related to the length and velocity scales of the large-scale turbulence. The proposed equation is compared with the available laboratory results for fine and coarse material 0.1 mm < D ? 45 mm over a wide range of particle sizes, density ratios and liquid viscosities and a reasonable agreement between the two is obtained. An incipient motion hypothesis based on the development of vorticity is proposed. |
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