Calibration and preparation of field measurements of oblique wave run-up and overtopping on dikes using laser scanners
P. Oosterlo (TU Delft - Hydraulic Structures and Flood Risk)
B. Hofland (TU Delft - Hydraulic Structures and Flood Risk)
J.W. van der Meer (Van der Meer Consulting Bv, IHE Delft Institute for Water Education, TU Delft - Hydraulic Structures and Flood Risk)
Maarten Overduin (Infram Hydren)
Gosse Jan Steendam (Infram International)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Wave overtopping is typically measured in the field using overtopping tanks. In this paper, an alternative system is developed that uses two laser scanners. The system also measures wave run-up, as well as run-up depths and velocities, both during perpendicular and oblique waves on a dike in the field. The paper considers the first calibration tests with the system in the field, with perpendicular and oblique waves generated by the wave run-up simulator on a grass dike slope. Furthermore, simulations are performed with the numerical wave model SWASH, to gain more insight in the potential performance of the system during actual oblique wave attack during a storm. The run-up is determined from the measured elevation and reflection intensity, which agrees well with the visually observed run-up. Run-up depths and front velocities can be determined accurately as well. The (virtual) wave overtopping discharge can be calculated from the data, which agrees well with the most commonly used overtopping equations for perpendicularly incident waves. Finally, from the simulated run-up data of obliquely incident waves, it is concluded that an estimate can be obtained of the incident wave period and wave angle of incidence at the toe of the structure.
help_outline