At the upper section the test will start with the wave volume that is one level lower than the level which led to a significant erosion at the lowest section (in 10 waves). The volume is then increased to at most one level above the level at which the test may have been aborted in the lower or the middle section. Finally, the volume is decreased to 500 l/m. At every level, 20 waves are applied, with a maximum 60 second break after every 10th wave. New examples, closely connected to the examples in activity 101, with the assumption that the erosion in the middle section is not worse than in the lower section: 1. Start with 20 waves of 1500 l/m, with a maximum wave volume of 3400 l/m (this maximum is based on the specified limits). 2. Start with 20 waves of 1500 l/m, with a maximum wave volume of 3000 l/m. 3. Start with 20 waves of 3000 l/m, with a maximum wave volume of 3400 l/m (the ‘regular’ maximum volume of the current wave overtopping simulator). In case the erosion at the middle section was worse than at the lower section (to be estimated by Deltares and the local test leader), then the test in the upper section will start at one level below that worse level, increasing to one level higher, followed by a decrease to 500 l/m. For example, in case serious erosion occurred in the middle section at 1500 l/m and that test had to be aborted at that level. Then the middle section was clearly weaker than the lower section. Then the test in the upper section will start with 20 waves of 1000 l/m, and the maximum volume is 2000 l/m. A total wave time is difficult to specify on beforehand, but most likely it will not be much more than 1.5 hours (including the maximum of 60 seconds break after every 10 waves).

10 GoPro's for photogrammetry for monitoring the difference in erosion depth between waves and for determining the front velocities of waves

The images from the GoPro's could be analysed using photogrammetry to get a full coverage of the change in erosion depth. This was used to determine an erosion relation.