Robin Harrison, Binna Burra
In the early 80s I had a significant role in the observation of northerly sand drift on Adelaide’s beaches; another seriously interfered with dune field. Since the South Australia government have to constantly transport sand from the northern beaches to the south at vast expense, the scientific examination of this phenomenon was already exhaustive. The science is well and truly in; hard revetments on dune systems is a complete and utter no-no!
The science is conclusive, just as it is with anthropogenic climate change. As with ACC there are plenty of people with a lack of knowledge or a short term vested interest eager to debate something that has been proven beyond debate. Hard revetments on dune fields have a profoundly negative effect. The only solution is to mimic the wave absorbing qualities of dunes.
We’re stuck with the rocks at main beach and the most sensible suggestion I’ve heard regarding them is David Gillette’s: reshape them to mimic dunes.
I’m not suggesting Belongil should not be protected. Of course it should, but we must pay attention to the science if we want a lasting solution rather than a disaster.