Cottesloe water line falling
REGARDING ocean level rises’ affect in Cottesloe, as I pointed out, the ocean level has gone up by about 70mm since 1993, meaning 7m loss of average water line permanently off most beaches in the world.
For Cottesloe I think it represents about 50 per cent to 70 per cent of that, because the groyne and the reef formations add extra stability, so the loss is about 3.5 to 5 metres.
At least 3m has disappeared since 2004 when I did a report for the Town of Cottesloe, which is exactly what I have been saying for many years.
That is about 3mm per year, and slowly increasing, and exactly what I have been predicting for a long time using published NASA data.
I figure Cottesloe permanently lost three metres this year, compared with 14-18 years ago, in comparison with the corresponding high tide seasons at that time.
The sand dunes don’t lie. Very high season peaking every 18 years is correct, so goodbye to another 4m in 2040 or so. Everyone will be running to their phone then because that will be highly noticeable. A visit to the beach, and viewing of my photos from this and last year would show the extent of ingress at the beach even now.
I defy any expert saying they have seen the sand dunes like this before. One can see the ancient layering of the sand that built these dunes simply chopped off.
GARRY BAVERSTOCK, Swanbourne