Abstract
Waves during major storms can cause significant changes to coastal morphology (Lee et al., 1998). The beach-dune system is known to be highly vulnerable to erosion when the wave run-up exceeds the threshold of the base of the dune in the collision regime, according to the Storm Impact scale defined by Sallenger (2000). Detailed bathymetric measurements are very difficult to obtain during storms due to the hazardous wave conditions. However, bathymetric surveys can be easily and intermittently performed during smaller scale physical model experiments (e.g., Hamilton et al., 2001) and high resolution can be achieved using laser scanning with Light Detection and Ranging (LIDAR) sensors (Smith et al., 2017). In the present study, a laboratory experiment of beach-dune morphology change is conducted in a rectangular wave basin that has recently been used to simulate erosion of a 2-dimensional sand dune (Berard et al., 2017). The objective of the present study is to investigate the 3-dimensional morphologic response of a sand beach-dune system to storm waves approaching at an oblique angle.
Highlights
Waves during major storms can cause significant changes to coastal morphology (Lee et al, 1998)
The wave conditions are characterized by a range of statistical bulk properties of Hs (7-11 cm) for a constant Tp (1.5 s) and varying duration (10-20 min) at each step to simulate changes in the storm energy over time
The experimental goal is to measure the changes to the beach morphology induced by nearshore hydrodynamics over time
Summary
Waves during major storms can cause significant changes to coastal morphology (Lee et al, 1998). This is composed of offshore waves generated by the 10.5 m wide piston-type wave paddle, the beach-dune system, and the instruments. A storm is simulated using five different steps in wave energy.
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