Abstract
The Grande-Motte port and seafront development project on the French Mediterranean coastline entailed evaluating wave impact loads (pressures and forces) on the new beach seawall and comparing the resulting scour potential at the base of the existing and new seawall. A physical model was built at ARTELIA's hydraulics laboratory in Grenoble (France) to provide insight into: wave and setup at the beach, the evolution of scour over time at the front of the wall, quasi-static and impulsive wave force intensity and distribution on the wall, and water and sand overtopping discharges over the wall. Light-weight sediment physical model and pressure and force measurements were performed with scale 1:18. The paper will discuss the pros and cons of a physical model versus numerical/ empirical modelsRecorded Presentation from the vICCE (YouTube Link): https://youtu.be/AeW3SPwDtVg
Highlights
The Grande-Motte port and seafront development project on the French Mediterranean coastline entailed evaluating wave impact loads on the new beach seawall and comparing the resulting scour potential at the base of the existing and new seawall
The impulsive loads were separated from the quasi-static signal firstly by applying a low pass (LP) filter with a cutoff frequency of 0.4 Hz and secondly Peaks Over Threshold method with an alpha-fraction of 50% of the 0.5 kPa threshold
It discusses the pros and cons of such methodology versus others, notably regarding structures peculiarities and model effects
Summary
The Grande-Motte port and seafront development project on the French Mediterranean coastline entailed evaluating wave impact loads (pressures and forces) on the new beach seawall and comparing the resulting scour potential at the base of the existing and new seawall. A physical model was built at ARTELIA’s hydraulics laboratory in Grenoble (France) to provide insight into: wave and setup at the beach, the evolution of scour over time at the front of the wall, quasi-static and impulsive wave force intensity and distribution on the wall, and water and sand overtopping discharges over the wall. Hammer tests identified the model eigenfrequencies to be 48Hz/126Hz and 97Hz/234Hz inside and outside water respectively (0.09s/0.03s and 0.04s/0.02s periods at prototype scale), which were outside of the measured quasi-static regime. The following figure shows probe measured spectral significant wave heights and setups versus SWASH numerical model (http://swash.sourceforge.net/) estimations for the 1997 storm pic. The following figure shows a capture of the pressure signal measured on the curved wall top section
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