stevco123 wrote: ↑Mon May 18, 2020 9:10 pm
Erosion is one thing that baffles me. Doesn't basic physics tell us that water will naturally erode the edges of beaches regardless. Also weren't the areas around inverloch covered in water once upon a time, many metres above the current ground level?
Probably a discussion for another thread, but just baffles me, that's all
With stable sea level beaches should be more or less in equilibrium. Some will come and go, but over time and over regions they should revert back to the average. That changes when you have rising or lowering sea level. Each cm of sea level translates into an average of 1cm of recession. We’ve now seen about 30cm since 1900 and are seeing that play our rapidly around the world. Expect your news feed to be full of articles going forwards
The coast around Inverloch used to sit about 50-100m further inland 6000 years ago. At this point sea level appears to have been about 1m higher, though details are a bit uncertain as parts of that coast are rising. The fault line known as the. Waratah Fault is seeing Cape Liptrap rise at a rate of between 2 and 4mm per century which isn’t a lot on human time scales, but adds to metres over Millenia.
The peak around 5000 years ago was at a time when global temperatures were about the same as now or probably a bit cooler. That tells you how much rise is still coming our way even if there is no further rise. Glaciers and ice sheets take a long time to catch up with temperatures.
I find erosion really interesting as it’s the Australian equivalent of glaciers. It’s also a very odd extreme as eventually as the trend continues you get very extreme impacts from quite minor systems. It turns out that with the rate of sea level rise that the 1 in 50 year storm surge doubles in frequency every five years.
Progs holding on what promises to be a complex system. First trough tomorrow morning, second around Thursday morning and then possibly another around Saturday morning. Deep low forms off the NSW coast near Sydney. Could be a nasty system for them, but details matter a lot with these lows usually having multiple mesoscale centres.
Btw could even get a May WA Tropical cyclone around Sunday. Could be big rain producer for northwest OZ. Too early to call it as tropical or ex tropical at landfall. Will have to check if this has happened before