Breakwater Repair: Monitoring, Modelling, and Construction

摘要

The trunk section of the south breakwater, at the entrance to the prot of Richards Bay, has suffered some damage since its construction which was completed in 1976. This paper briefly discusses the changes in the design conditions as a result of sand-trap dredging off the breakwater, the annual photographic monitoring results showing the excessive rates of damage, and the model testing of various repair options, using 20t and 30t dolosse. Both 2D flume and 3D basin model tests were carried out at various scales, with fixed and movalbe bed models. Finally the construction of the optimal repair, carried out in 1997/98, using a heavy duty mobile crane (with 48m boom reach) and DGPS positioning, is described.