New bed shear stress estimator for net sand transport rate predictions under non-linear waves

T. Abreu, Dominic Alexander Van Der A, P.A. Silva, F. Sancho, H. Michallet

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The estimation of the bed shear stress is a crucial step in many sediment transport formulae since, when bedload is dominant, sediment transport can be parameterized in terms of the bed shear stress. In this work, the performance of a new bed shear stress estimator for nonlinear waves is analysed. The effects of velocity and acceleration skewness are incorporated in the time-varying bed shear stress using two parameters: the index of skewness or nonlinearity, r, and the waveform parameter, phi. The results are compared with two different data
sets obtained in the Aberdeen Oscillatory Flow Tunnel, under accelerated-skewed oscillatory flows. When applied to a typical bedload formula, the new expression considerably improves the prediction of the net sand transport rates. A sensitivity analysis for the phase-lead between the bed shear stress and the outer flow indicates that the new expression provides the best trends between predicted and measured transport rates when compared to other parameterizations. This work provides further insights in the correct prediction of sediment transport modelling, accounting for the effect of nonlinear wave shapes.
Original languageEnglish
Pages (from-to)2007-2011
Number of pages5
JournalJournal of Coastal Research
Volume64
Issue numberSI
Publication statusPublished - 2011
EventInternational Coastal Symposium 2011 - Szczecin, Poland
Duration: 9 May 201114 May 2011

Keywords

  • bed shear stress
  • sand transport
  • non-linear waves
  • oscillatory flow

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