ABSTRACT
Physical modelling is indispensable in coastal engineering, but a continuous adaption of methods, techniques and, in some cases, of the dimensions of the research facility is necessary. This chapter provides some flashes from projects at the Delft Hydraulics Laboratory in the field of slope revetments, breakwaters and dams. Gravel is an indispensable link in the overall picture between sand and rubble. Model experiments are in most cases indispensable to arrive at an appropriate design of a slope protection by artificial units. The reliability of the small scale model is adequate as long as the properties of the natural waves are simulated correctly and as long as the internal stability of the elements is of no importance. For the design of the Storm Surge Barier in the Eastern Scheldt in the Netherlands this phenomenon was important, but as this barrier had to be built in a water depth of about 40 m full scale testing was impossible.
