1 WAVE OVERTOPPING SIMULATOR TESTS ON TRANSITIONS AND OBSTACLES AT GRASS COVERED SLOPES OF DIKES

Previous tests performed with the Wave Overtopping Simulator showed that objects on dikes may impose a weak spot. To investigate this conclusion further, new wave overtopping tests have been performed in 2013, within the Dutch program SBW (Strength and Loads on Water Defences). These tests were particularly aimed at the influence of transitions between the soft cover layer of clay and grass and hard structures like asphalt and concrete. Specific tests were performed to determine the influence of transitions and objects on the critical velocity of the grass covered slope, which is used in the cumulative overload method.. In addition pulling tests on grass were performed, using a new developed device. Further analysis may give a relationship with the critical velocity