Marine current-induced bedload sediment transport: 5th DNVA-RSE Norway-Scotland Waves Symposium

Alistair Borthwick, Margaret Creed, Sergio Maldonado

Research output: Other contribution

Abstract / Description of output

Marine sandbanks are natural seabed features found in shallow seas or the mouths of estuaries, which may be historical relicts from the time when the sea level was lower (see e.g. Dyer and Huntley, 1996). Marine spoil heaps are of similar shape, but derive from human activities such as marine mining. Marine sandbanks and spoil heaps are typically composed of coarse sediment particles that move through bedload transport (i.e. the particles roll, slide, or saltate) under the action of local currents. The migration of such sandbanks tends to be slow (even on decadal timescales), but is nevertheless important given that sandbanks can act to protect coastlines, may be dredged for aggregate, and are potential sites for marine renewable energy farms. Sandbars are the two-dimensional analogue of sandbanks, again predominantly composed of coarse sediment. This presentation will describe a morphodynamic model that has been modified to include bed-slope-induced morphological diffusivity and is used to simulate the evolution of a bed hump in a steady current.
Original languageEnglish
TypeConference Abstract
Number of pages2
Publication statusPublished - 2017

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