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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Study of the overtopping flow impacts on multifunctional sea dikes in shallow foreshores with an hyb...
Study of the overtopping flow impacts on multifunctional sea dikes in shallow foreshores with an hybrid numerical model
Author : CORRADO ALTOMARE(1),(2), YUKI OSHIMA(3), XUEXUE CHEN (4), ALEJANDRO J.C. CRESPO(5) & TOMOHIRO SUZUKI(1),(6)
ABSTRACT
The present work describes the validation of a hybridization technique between two different numerical models, namely
SWASH and DualSPHysics, to study the impact of overtopping flows on multifunctional sea dikes in shallow foreshores.
Previous works on the SWASH-DualSPHysics hybridization were presented by Dominguez et al. (2014) and Altomare et
al. (2014), where the technique was validated against physical model results of wave propagation and run-up over sandy
beaches. The present work aims to extend the use of this hybridized model to the analysis of wave-structure interaction: a
typical case from the Belgian and Dutch coastline is used, where a building is constructed on the top of the dike. The
building represents the last defense against the overtopping flows and the wave loads acting on it have to be properly
characterized. Physical model tests were carried out at Flanders Hydraulics Research to measure forces on the vertical
wall (i.e. building), the layer thickness and velocities of the overtopping flows. The results from the experimental campaign
have been used to validate the hybridization. SWASH is previously validated against the physical model results: wave
propagation, transformation and breaking have been accurately modelled and the conditions at the toe of the dike are
reproduced as in the physical model test. Then SWASH is implemented together with DualSPHysics to model the wave
impact. A hybridization point along the physical domain has been defined. SWASH provides the boundary conditions for
DualSPHysics at that location. DualSPHysics is used to model the closest part of the domain to the dike. The results of
this hybridization strategy confirm the accuracy of the technique. Water surface elevation, velocity field of the overtopping
flows and wave forces, as measured in DualSPHysics, are in good agreement with the physical data. The results of the
validation are reported in this work.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 13/08/2015
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