Cross-Shore Sediment Transport Modelling and Comparison with Tests at Prototype Scale

by Klemens Uliczka, Bundesanstalt fur Wasserbau, -Aussenstelle Kuste-, Wedeler, Landstrasse, Hamburg, Germany,
Robert B. Nairn, Bundesanstalt fur Wasserbau, -Aussenstelle Kuste-, Wedeler, Landstrasse, Hamburg, Germany,



Document Type: Proceeding Paper

Part of: Coastal Sediments

Abstract:

A series of prototype scale laboratory experiments have been performed at the Large Wave Channel (GWK) in Hanover to investigate the process of sediment transport over a horizontal bed induced by unbroken waves. The selected monochromatic wave heights ranged from 0.25 m to 1.7 m and wave periods from 3 s to 9 s were considered, the water depth was 4.5 m. Flow velocity and sediment concentration measurements were made at several elevations above the bed. A simple sediment trap was also deployed to obtain a Lagrangian estimate of the sediment transport rate. In this paper, the results of the experiment are compared to the predictions from a numerical model for sediment transport based on the time-averaged Energetics approach. Predictions of the orbital velocity, the mean flow velocity, the bedform and the sediment transport rate are compared to the measured values. The time-averaged approach to sediment transport modelling provides an adequate representation of the process for those wave conditions when most sediment is transported.

Subject Headings: Sediment transport | Numerical models | Flow measurement | Water waves | Hydraulic models | Fluid velocity | Comparative studies

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