Coastal erosion thread

velocityjohnno's picture
velocityjohnno started the topic in Saturday, 15 Jun 2019 at 10:47am

There's not really a coastal erosion thread that I can see, beyond some excellent articles on the site. Post up examples you find in your area, and maybe how the sand banks and wave quality change.

velocityjohnno's picture
velocityjohnno's picture
velocityjohnno commented Saturday, 15 Jun 2019 at 10:52am

https://www.abc.net.au/news/2019-06-13/port-beach-buildings-in-danger-af...

There was many a session here for me in the 90's and 2000's in the corner getting out of the wind, and just up the stretch arguably had the best winter banks the metro area could offer. The port was always doing work on the place, so I figured that each time they did changed the sand, leading to starvation upstream. Old timers said this area had great little waves before the North Mole (sp?) was put in.

The article suggests that sand dumping 1890 to 1970 is now over, so Sandtrax will be eroded out, and it's accumulating at Leighton. A pity, I fondly remember the pyramidal wedges that would break off the rock wall.

mowgli's picture
mowgli's picture
mowgli commented Wednesday, 17 Jul 2019 at 2:07pm

Hey Johnno,

Lots of Councils all along the Oz coast doing coastal management plans that take into account sea level rise. Basically, the higher MSL is, the further across the land storm waves can reach. Basic stuff. Here in QLD there's a big state run program going on called QCoast and there's something like 30 odd Councils involved in it, including the Gold and Sunny Coast councils. The issue proving most thorny for any council seems to be coastal erosion. Especially when you think about where the most exxy houses are...

“Life is a long lesson in humility.”

velocityjohnno's picture
velocityjohnno's picture
velocityjohnno commented Wednesday, 17 Jul 2019 at 8:41pm

No worries Mowgli. Since I posted the thread we've had the Port Beach article here at Swellnet which was pretty good crowd-research, and it appears to be a man-made thing; now it seems the sand supply created by the dredging of Freo port is running out, much like how the Councils and Ports have noted. Solution is a sand pipe line from offshore channels to create a Perth Superbank Left :)

truebluebasher's picture
truebluebasher's picture
truebluebasher commented Thursday, 18 Jul 2019 at 11:46pm

Wide open ended thread velocityjohnno...allows for Saltwater preface.
Crew wish to acknowledge Saltwater people up front as their history erodes first.

Oz wide Aborigines retell greatest erosion tales of highest seas coming & going.
These local stories are the most telling oldest tales of Climate Change.
We know of Ocean Events depositing sea creatures into Lagoons.
Also of Rain flooding Rivers breaking seaward thru Spits then flooding bays.
Part man - part Sea Creature to survive. Of headlands rising & Sea receding.
A world of ocean wonder of singing to sea creatures from changing landscapes.
https://theconversation.com/ancient-aboriginal-stories-preserve-history-...

Aboriginal Rock Structures are again the oldest & perfectly wed all these worlds.
Estuarine & River Mouth Fish Traps reshape & advantage merging environments.
Such structures are accessed by Sea Companions & Community to Campsite
100's of ancient harmonious arenas co exist in the heart of our surf breaks
https://newmatilda.com/2019/02/05/australia-one-oldest-human-made-struct...

Oz wide Aborigines prided their designer seascapes with visiting communities.
Each Rock pool of varied catch adorns their Surf God like a garland as a banquet.
All encompassing Sea festivals of up to 5,000 visitors from 500 mile radius.
Saltwater crew tendered the estuary & befriended the life within the Ocean.
Everything had to play a part equally for all to benefit, mindful not to impact next.

Saltwater crew micromanage whole landscape in order to rejuvenate coastline.
Erosion: Seasonal Fires kill weeds & natives are replanted + full fishing rights,
Giving Saltwater crew full rights enables 100% recovery with ongoing resource.
Aborigines will fully support themselves & detox our coasts...A Win! Win! for all.

Examples of Saltwater erosion repair lies within Government partnerships.

https://coastadapt.com.au/sites/default/files/case_studies/CS08_Indigeno...

https://eatlas.org.au/nwa/indigenous/guide

South East Country is a major work as in keeping with other S/E natural heritage.
https://www.environment.gov.au/system/files/resources/271c0bfc-34a2-4c6c...