COMPARISON OF NUMERICAL MODELS FOR WAVE OVERTOPPING AND IMPACT ON A SEA WALL

Dieter F.A. Vanneste, Corrado Altomare, Tomohiro Suzuki, Peter Troch, Toon Verwaest

Abstract


The paper discusses three different numerical models in a study of wave overtopping and impact on a sea wall. The models used are SWASH (based on the nonlinear shallow water equations), DualSPHysics and FLOW-3D (both based on the full Navier-Stokes equations). The models are validated against experimental measurements in a setup with a quay wall and berm in front of the sea wall. The two models based on the full Navier-Stokes equations provide good estimates of the wave impact on the sea wall. Moreover, reasonable agreement with experimental values of averaged overtopping discharges was found for the full test time series simulated with FLOW-3D. Notwithstanding the SWASH model provides reasonable estimates for the wave overtopping on a simple quay wall, at a significantly lower computational cost than the other two models, it clearly underrates the overtopping discharge in the case of a combination of a quay wall, berm and sea wall. Further investigation is needed to draw conclusions on the model accuracy of SWASH in such a case.

Keywords


numerical model; sea wall; wave overtopping; wave impact; validation; wave flume experiment

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References


Crespo A.J.C., Gómez-Gesteira M., Dalrymple R.A., Boundary conditions generated by dynamic particles in SPH methods, CMC: Computers, Materials, & Continua. 5(3) (2007) 173-184.

Crespo A.J.C., J.M. Domínguez, M. Gómez-Gesteira, A. Barreiro and B.D. Rogers. 2012. User Guide for DualSPHysics Code v2.0.

EurOtop. (2007) Wave Overtopping of Sea Defences and Related Structures: Assessment Manual, Environment Agency (UK)/Expertise Netwerk Waterkeren (NL)/Kuratorium fur Forschung im Kusteningenieurswesen (DE).

Flow Science, 2014. Flow-3D User Manual Version 10.1. Flow Science, Inc., USA.

Frigaard P. and Christensen M., 1994. An absorbing wave-maker based on digital filters. Proceedings of the 24th International Conference On Coastal Engineering, ASCE, 168-180.

Gómez-Gesteira M., B.D. Rogers, R.A. Dalrymple, A.J.C Crespo. 2010. State-of-the-art of classical SPH for free-surface flows, Journal of Hydraulic Research, 48, 6-27.

Mansard, E.P.D. & Funke, E.R. (1980) The measurement of incident and reflected spectra using a least squares method. Proceedings of the 17th International Conference On Coastal Engineering, ASCE, 154-172.

Van Doorslaer, K., L. Baelus, J. Op het Veld and J. De Rouck. 2012. Fysische modelproeven Vandammesluis. Overtoppingsreductie mbv. stormmuren. Krachten en overtopping - schaal 1/25. Technical Report VDS301/016C (in Dutch). Dept. Of Civil Engineering, Ghent University

Vanneste, D. 2012. Experimental and Numerical study of Wave-Induced Porous Flow in Rubble- Mound Breakwaters, Ph.D. thesis, Faculty of Engineering and Architecture, Ghent University, Ghent (Belgium).

Zijlema, M., G.S. Stelling and P. Smit. 2011. SWASH: An operational public domain code for simulating wave fields and rapidly varied flows in coastal waters. Coastal Engineering, 58: 992- 1012.




DOI: https://doi.org/10.9753/icce.v34.structures.5