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STABILITY OF WIDE TOE BERM BREAKWATER WITH VARYING SEABED SLOPE

ABSTRACT Stability of rubblemound breakwater as a whole depends primarily upon the stability of the individual armour units against the wave attack. The manner in which waves interact with the structure is governed not only by the form of the structure, but also by the seabed slope. In order to study the effect of seabed slope on the stability, hydraulic model tests were conducted on a breakwater section in a wave flume with different seabed slopes of 1: 120 and 1: 50. The tests were conducted with breaking and non-breaking waves with two different water levels and two wave periods. Model studies indicated that the stability of armour units decreases with steeper bed slopes. The results are useful for optimising the design of breakwaters. Simulation of seabed slope in the hydraulic model is crucial in finalising the design of rubblemound breakwater section.