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Coastal and Estuarine Studies


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  • 3022 Marine Geology and Geophysics: Marine sediments—processes and transport



Net transport of fine sediment in a homogeneous tidal channel

J. van de Kreeke

For a tidal channel with water of homogeneous density, a semi-analytical expression is derived for the tidally-averaged displacement of a sediment particle in terms of the amplitudes and phases of the harmonic constituents of the Lagrangian velocity. Transport of sediment is by erosion—advection—deposition. The amplitudes and phases of the Lagrangian tidal current constituents are related to the amplitudes and phases of the Eulerian tidal current constituents and the gradient of the amplitude of M2. It is assumed that the Eulerian velocity field consists of a mean current and M2 and its overtides. From the semi-analytical expression for the net particle displacement it follows that the direction of the sediment transport is determined by the phase between the M2 and M4 constituent of the Lagrangian velocity. In terms of the Eulerian velocity field this phase angle depends on the phase between M2 and M4, the ratio of the amplitudes of M2 and M1 and the gradient of the amplitude of M2. Application to channels with a length of 100 km and a depth of 10 m shows a divergence of the net sediment transport with a seaward net transport in the seaward one third of the channel. This is in agreement with results of calculations in which the advection diffusion equation for sediment transport was solved numerically.

Citation: van de Kreeke, J. (1996), Net transport of fine sediment in a homogeneous tidal channel, in Mixing in Estuaries and Coastal Seas, Coastal Estuarine Stud., vol. 50, edited by C. Pattiaratchi, pp. 361–373, AGU, Washington, D. C., doi:10.1029/CE050p0361.

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