Abstract
To study the performance of amour blocks under the action of tsunami, experiments in an open channel and numerical simulations by CADMAS-SURF/3D were performed. The width of coastal structure were changed in the experiments. Three failure modes for amour blocks, (1)overturning, (2)sliding and (3)collapse due to suction were observed in the experiments. To enhance the stability of amour blocks, the connected amour blocks were proposed. With increasing of the width of coastal structure, the horizontal flow grew in speed. Therefore the stability of amour blocks decreased. The agreement for velocity distribution between the calculation and experiments will improve, considering the permeability of the mound.
