Past public lecture 23rd Nov 2016

Refining critical design conditions for Breakwaters using measured damage by the June 2015 storm

By Indra Jayewardene

The public lecture organised by IESLindra-1NSW Chapter was held on Wednesday the 23rd of November 2016 at the Institute of Engineers,  Australia auditorium.

Starting off with a couple of vivid images of the damage caused to the Manly Fairy Bower Seawall by the June 2016 storm and a video of the massive waves that hit it, Eng. Jayawardane explained the importance of breakwater repairs and went through a brief history on the breakwater assessment techniques over the recent decades.

Then he went on describing the functional design and physical phases of a breakwater showing the key parameters involved in numerical modeling and highlighted the importance of simulating damage scenarios in the modeling phase. He presented several case studies that he was carried out on numerical modeling as well as physical modeling, such as Forster Head and Coffs Harbour.

Throughout his talk, Eng. Jayawardane presented many examples of storm damages to crests, heads and trunks, the associated design models and their strengths and weakness. Concluding, he stressed the importance of timing of the breakwater repairs and how the existing models could be improved for future designs learning from past storm damages and experiences.

The damage occurred to the breakwaters built on the NSW coastline due to the June 2016  storm , which recorded the highest ever wave height of 17.7m will be discussed in this talk. Our speaker will be Indra Jayewardene (MIE Aust, CPEng, NPER). He has 37 years coastal engineering experience in Australia, Sri Lanka, Denmark and the Maldive Islands. He has published 35 papers in international proceedings and Journals. Indra has worked in Manly Hydraulics Laboratory for the past 26 years on Coastal Processes and wave and structure interactions where he is employed as a senior engineer.