Wave Transmission at Rubble Mound Structures

Measurements of wave transmission at a trapezoidal submerged rubble mound breakwater are analysed and discussed with respect to the design formula of d’Angremond et al.. Transmission coefficients agreed well within the given range of validity, however, an appropriate crest height and crest width from the rubble mound surface has to be used. Special interest has been put on results beyond the upper limit of the formula, e.g. relatively high water levels, the variation in the mean transmitted periods, and on some results from numerical modelling. For comparison, results from a similar previous test series with tetrapod cover layer are shown, to demonstrate limitations.