Rocking armour units: Number, location and impact velocity

Abstract

As a part of a very extensive research on strength of concrete armour units model tests were performed on breakwater sections armoured with Cubes and Tetrapods. Stability tests resulted in a prediction of the number of moved units and the number of impacts as a function of wave height, period and location on the slope. Measurements on acceleration during impacts resulted in a description of the distribution of impact velocities at the centre of the unit. The expressions are applicable in prototype conditions.