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Citació: Van den Berg, N.; Falqués, A.; Ribas, F. Shoreline sand waves and beach nourishments. A: International Conference on Coastal Engineering. "32nd International Conference on Coastal Engineering". Coastal Engineering Research Council, 2010, p. 1-10.
Títol: Shoreline sand waves and beach nourishments
Autor: Van den Berg, Niels Veure Producció científica UPC; Falqués Serra, Albert Veure Producció científica UPC; Ribas Prats, Francesca Veure Producció científica UPC
Editorial: Coastal Engineering Research Council
Data: 2010
Tipus de document: Conference report
Resum: The effects of the feedback between the changing coastal morphology and the wavefield on the generation and propagation of large scale (O(1-10 km)) shoreline sand waves is examined with a quasi-2D morphodynamic model. Traditional shoreline change models do not include this feedback and are only able to describe diffusion of shoreline sand waves and furthermore they are unable to describe migration. It is found with the present model that if there is a dominant littoral drift, the feedback causes downdrift migration of coastline features no matter if they grow or decay. Consistently with previous studies, simulations show that a rectilinear coastline becomes unstable and sand waves tend to grow spontaneously from random perturbations, if the wave incidence angle is larger then about 42º (θc) at the depth of closure (high angle wave instability). The initial wavelengths at which the sand waves develop are 2-3 km and this is similar to previous linear stability analysis. The implications of high angle wave instability for beach nourishments are investigated. The nourished shoreline retreats initially due to cross-shore transport because the nourished profile is steeper than the equilibrium profile. When a dominant littoral drift is present, the nourishment also migrates downdrift. If the wave angle at the depth of closure is below θc the alongshore transport contributes to the diffusion of the nourishment. However, if the angle is above θc (constant high angle wave conditions) the diffusion is reversed and the nourishment can trigger the formation of a shoreline sand wave train. Numerical experiments changing the proportion of "high angle waves" and "low angle waves" in the wave climate show that relatively small proportions of low angle waves slow down the growth of sand waves. These simulations with more realistic wave climates show shoreline sand waves that migrate downdrift maintaining more or less the same amplitude for years.
URI: http://hdl.handle.net/2117/12312
Versió de l'editor: https://journals.tdl.org/ICCE/article/view/1310/pdf_316
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DF - Dinàmica No Lineal de Fluids. Ponències/Comunicacions de congressos
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