The unusual factors causing popular Aussie beach's collapse
Byron Bay’s Main Beach being devoured by water has been put down to “unusual” circumstances as wild weather continues to lash northern NSW.
The bay received 33mm in the 24 hours leading up to 9am Monday, according to the Bureau of Meteorology.
BOM meteorologist Dean Narramore said “major coastal erosion” is expected to impact from South East Queensland to the NSW Central Coast. It’s forecast to worsen too, he said.
Wind gusts of up to 104km/h were also detected at Cape Byron at about 9.23am.
People have been shocked by the impact the wild weather has had on Byron Bay’s Main Beach with the shore swallowed by water.
Byron Mayor Simon Richardson told the media on Monday “we’re watching our beach disappear”.
A man was filmed walking on a platform at Byron Bay on Monday before it collapsed beneath him into the ocean. Thankfully he wasn’t serious injured.
Dr Mitchell Harley, from UNSW’s School of Civil and Environmental Engineering, told Yahoo News Australia La Nina events can cause periodic erosion.
Severe Weather Update: dangerous rain and #erosion continue in northeast #NSW and southeast #QLD. Video current at at 11:30 am AEST Monday 14 December 2020.
Latest forecasts: https://t.co/boJ4ZEiUYA @QldFES @NSWSES pic.twitter.com/hR9sMkXFcU— Bureau of Meteorology, Australia (@BOM_au) December 14, 2020
But it’s this combined with a process called “headland bypassing” which is causing Byron Bay’s Main Beach issues during the wild weather.
La Nina, a climate driver, is what scientists say is responsible for enhancing the intensity of rain. It was declared active earlier this year after last being present in 2011.
“It’s an unusual event as we already have an eroded beach due to the lack of sand around the headland at Byron Bay,” Dr Harley said.
“You then combine that with the fact it’s a La Nina year.”
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Dr Harley said it could be months until the beach fully recovers however we shouldn’t be concerned about our beaches disappearing.
Professor Rodger Tomlinson, from the Griffith Centre for Coastal Management, told the ABC last week Byron Bay has had erosion for a number of years.
Professor Tomlinson added the headland bypassing, which is what is blocking sand from being moved down the coastline by waves, is causing issues.
He said Cape Byron, which is the easternmost point of Australia, hasn’t seen its sand move south to Main Beach. It could also take years until the sand moves depending on the waves.
Other concern over changing beaches
Steven Pearce from Surf Lifesaving NSW told reporters it’s “some of the largest coastal erosion we have seen for many years” and it’s changing the “entire landscape”.
“From our perspective what that means is that it changes the entire formation of the beaches and also starts to develop new permanent rips along beaches that have not necessarily had those rips previously,” Mr Pearce said.
Mr Pearce added he’s concerned about the “onslaught of visitation” after the rain passes due to Covid-19.
“People will go to beaches where they think it has been safe previously but there will be new rips,” he said.
“The message is for people to be really aware about rips and swimming at patrolled locations where the red and yellow flags will be flying.”
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