Sheet flow sediment transport under waves with acceleration skewness and boundary layer streaming

Nielsen, P. (2006) Sheet flow sediment transport under waves with acceleration skewness and boundary layer streaming. Coastal Engineering, 53 9: 749-758. doi:10.1016/j.coastaleng.2006.03.006


Author Nielsen, P.
Title Sheet flow sediment transport under waves with acceleration skewness and boundary layer streaming
Journal name Coastal Engineering   Check publisher's open access policy
ISSN 0378-3839
1872-7379
Publication date 2006-07-01
Year available 2006
Sub-type Article (original research)
DOI 10.1016/j.coastaleng.2006.03.006
Open Access Status Not Open Access
Volume 53
Issue 9
Start page 749
End page 758
Total pages 10
Editor H. F. Burcharth
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 290899 Civil Engineering not elsewhere classified
770400 Coastal and Estuarine Environment
Abstract The effect of acceleration skewness on sheet flow sediment transport rates (q) over bar (s) is analysed using new data which have acceleration skewness and superimposed currents but no boundary layer streaming. Sediment mobilizing forces due to drag and to acceleration (similar to pressure gradients) are weighted by cosine and sine, respectively, of the angle phi(.)(tau)phi(tau) = 0 thus corresponds to drag dominated sediment transport, (q) over bar (s)similar to vertical bar u(infinity)vertical bar u(infinity), while phi(tau) = 90 degrees corresponds to total domination by the pressure gradients, (q) over bar similar to du(infinity)/dt. Using the optimal angle, phi = 51 degrees based on that data, good agreement is subsequently found with data that have strong influence from boundary layer streaming. Good agreement is also maintained with the large body of U-tube data simulating sine waves with superimposed currents and second-order Stokes waves, all of which have zero acceleration skewness. The recommended model can be applied to irregular waves with arbitrary shape as long as the assumption negligible time lag between forcing and sediment transport rate is valid. With respect to irregular waves, the model is much easier to apply than the competing wave-by-wave models. Issues for further model developments are identified through a comprehensive data review.
Keyword Sheet flow
Bed load
Sediment transport
Acceleration skewness
Boundary layer streaming
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 17:58:04 EST