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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Reshaping of realistic beach nourishments under high angle wave conditions
Reshaping of realistic beach nourishments under high angle wave conditions
Author : B.J.A. HUISMAN(1), V. CURTO(2) & R. HOEKSTRA(3) & M.A. DE SCHIPPER(3)
e. larger than 45กใ with respect to the shore-normal) on the morphology of
nourishments has been investigated in literature using either a one-line approach or quasy-2D models. Typically, these
studies predicted downdrift nourishment migration and the generation of alongshore sand waves for coasts with
persistent high-angle wave conditions. The size of the nourishments or the cross-shore profile shape applied in these
studies is however much larger than what is common for the Dutch coast. This research therefore aims at exploring the
reshaping mechanisms of beach nourishments of realistic Dutch proportions as a result of high-angle waves. To this end
a Delft3D numerical model study was performed testing two conceptual nourishment configurations of 2 km long and a
cross-shore extent of respectively 250m or 1000m. First, the numerical model was applied to provide a qualitative
indication of the impact of high-angle waves by examining the spatial patters of wave height and direction as well as the
initial alongshore sediment transport fields. These computations show that for the Dutch coast situation nourishments
with a relatively small cross-shore perturbation (250m width and 2km length) are not likely to develop high-angle wave
instabilities even for continuous very obliquely incoming waves. As the initial sediment transport patterns indicate that
instabilities might be present for large nourishments (1km width and 2km length) the latter case was tested more
rigorously with a morphodynamic simulation. These simulations show that indeed some lee side effects could be
expected for continuous high angle waves. Further investigation with alternating low angled and high angled waves,
revealed that the sequencing and frequency of the high angled waves can be of importance. Although large
nourishments can migrate downdrift during high-angle wave conditions and generate some leeward erosion, a relatively
short period with low-angle waves can wipe out the features of the leeward erosion.Form Required :Published Date : 123
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 20/08/2015
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