Sand transport by surface waves: can streaming explain the onshore transport?

Wouter Kranenburg, Jan Ribberink, Rob Uittenbogaard

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Abstract

In wave flumes an onshore boundary layer current is present that is not present in oscillating flow tunnels. We investigate numerically the hypothesis that this streaming explains the measured increase of onshore directed sediment transport in flumes over tunnels. In the formulation and validation of the model special attention has been given to the wave-generated net current profile. From model experiments we conclude that the additional current indeed contributes to onshore transport, but can not be the full explanation of the measured differences in transport rates. Other contributing mechanisms are the amplification/reduction of the fall velocity by vertical sediment advection (only relevant for fine grains) and the amplification/reduction of the concentration at maximum onshore/offshore velocity by intra-wave gradients in horizontal sediment flux. The latter contributes, for the investigated cases, to onshore transport with comparable order as the boundary layer current. These conclusions are relevant for further development of parameterizations of wave-induced sediment transport for morphodynamic models.
Original languageEnglish
Title of host publicationProceedings of 32nd International Conference on Coastal Engineering (ICCE)
Subtitle of host publication30 June - 5 July 2010, Shanghai
EditorsJane McKee Smith, Patrick Lynett
PublisherCoastal Engineering Research Council
Pages1-14
ISBN (Print)978-0-9896611-0-2
DOIs
Publication statusPublished - 30 Jun 2011
Event32nd International Conference on Coastal Engineering, ICCE 2010 - Shanghai, China
Duration: 30 Jun 20105 Jul 2010
Conference number: 32

Publication series

NameCoastal Engineering Proceedings
Publisher978-0-9896611-0-2
ISSN (Electronic)2156-1028

Conference

Conference32nd International Conference on Coastal Engineering, ICCE 2010
Abbreviated titleICCE
CountryChina
CityShanghai
Period30/06/105/07/10

Keywords

  • METIS-275181

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