Description
Hs =5.95m, Ts=10.45 s, rock armour (7-10 t) An experimental study on a pre-existing 1:50 physical model was perfomed in the coastal on-shore tank in the LIC- Bari laboratory (during summer 2004) within a research about a stability of rubble mound breakwater roundheads. The research started in 2003 by analysing the results of a number of available technical reports of 3D physical models tests (Antifer, Cubes and Rock armour) and a field data concerning damaged rubble heads at Ostia-Rome marina breakwaters. A preliminary analysis of collected data had indicated that the reported armour damage was often greater than the one predicted by Hudson’s formula. Three analitycal relations among the roundhead characteristics and the incident waves were found. The first two relations correlate respectively the corrective coefficient of KD (Hudson’ formula for head) and the location of the most vulnerable head sector to a non dimensional parameter composed of the wave height H, the head radius R, the peak wave length at toe Lp and the water depth h.The last one gives the damage distribution along the roundhead related to the most damaged sector location and the parameters above mentioned. The results of this research will be presented at Coastal, Structures, Breakwater, 2005 ICE conf, London; “New criteria for the design of rubble mound breakwater roundheads” - Guiducci F., Pesce F.P., Franco L. (accepted publication).
