News & Developments: Henley Beach & Grange

[dbl96]

https://indaily.com.au/news/2023/03/29/ ... each-sand/

Should be as simple as removing them. Let the natural flow of the sand and tides restore the beaches naturally.

This just seems to be a problem that's getting worse as the years go by. Glenelg, West Beach, Semaphore, Henley... How long before we have no metro beaches or just a sliver of sand here and there like Melbourne and Sydney?
Find another solution for people to launch their fishing boats that wont destroy the metro beaches.
Our kids, their kids and so on should also be able to enjoy the metro beaches that we have for generations.

I've driven to Yorke Peninsula. There's a limit to how far north the sand can drift, someone could go to Port Wakefield and bring it back.

Has anyone asked the Kaurna people what the beaches were like before there were buildings on the front row of dunes? Perhaps it naturally comes and goes, but now we've anchored the reserve supply so the beach "disappears" instead of moving east a few metres.

Don't need to ask them, you can just go back a short time to before marinas, boat ramps and artificial breakwaters were built along the coast that have disrupted the natural movement of sand and tides. All so some recreational fishers can launch their tinnies a few times a year.

They were going to build a pipeline under the sand to pump said sand along the coastline to where it's needed. What happened to that? How well would that have worked? Was there going to be some sort of system developed that monitors the volume of sand per beach before it kicked in and started pumping sand around?
It's 2023 how the hell is there still not a proper solution beyond carting sand up and down beaches

It is well established the sand drift has been going on for thousands of years (probably since Gulf St Vincent flooded around 9-12 thousand years ago). The sand is eroded from the southern beaches and deposited further north because of prevailing currents. This process has resulted in the creation of the Lefevre Peninsula in the last 5-6 thousand years, and its gradual northern extension. The peninsula is now continuing to extend northwards on the other side of the dredged Outer Harbor shipping channel, in an area known as the Section Bank. This is where sand is being collected to replenish the southern beaches. Without intervention, the Lefevre Peninsula will continue getting longer, potentially until it blocks Barker Inlet entirely, and links up with the coast north of St Kilda. These processes are natural, but they have been accelerated since settlement by building over the dunes and the death of the seagrass meadows which held the sand together.

[rev]

I've driven to Yorke Peninsula. There's a limit to how far north the sand can drift, someone could go to Port Wakefield and bring it back.

Has anyone asked the Kaurna people what the beaches were like before there were buildings on the front row of dunes? Perhaps it naturally comes and goes, but now we've anchored the reserve supply so the beach "disappears" instead of moving east a few metres.

Don't need to ask them, you can just go back a short time to before marinas, boat ramps and artificial breakwaters were built along the coast that have disrupted the natural movement of sand and tides. All so some recreational fishers can launch their tinnies a few times a year.

They were going to build a pipeline under the sand to pump said sand along the coastline to where it's needed. What happened to that? How well would that have worked? Was there going to be some sort of system developed that monitors the volume of sand per beach before it kicked in and started pumping sand around?
It's 2023 how the hell is there still not a proper solution beyond carting sand up and down beaches

It is well established the sand drift has been going on for thousands of years (probably since Gulf St Vincent flooded around 9-12 thousand years ago). The sand is eroded from the southern beaches and deposited further north because of prevailing currents. This process has resulted in the creation of the Lefevre Peninsula in the last 5-6 thousand years, and its gradual northern extension. The peninsula is now continuing to extend northwards on the other side of the dredged Outer Harbor shipping channel, in an area known as the Section Bank. This is where sand is being collected to replenish the southern beaches. Without intervention, the Lefevre Peninsula will continue getting longer, potentially until it blocks Barker Inlet entirely, and links up with the coast north of St Kilda. These processes are natural, but they have been accelerated since settlement by building over the dunes and the death of the seagrass meadows which held the sand together.Adelaide coastline.jpgsection bank.jpg

Oh I had no idea it was impacting the inlet. Hopefully something permanent can be done to sort this out while we still have beaches and beaches to save.

[SBD]

Don't need to ask them, you can just go back a short time to before marinas, boat ramps and artificial breakwaters were built along the coast that have disrupted the natural movement of sand and tides. All so some recreational fishers can launch their tinnies a few times a year.

They were going to build a pipeline under the sand to pump said sand along the coastline to where it's needed. What happened to that? How well would that have worked? Was there going to be some sort of system developed that monitors the volume of sand per beach before it kicked in and started pumping sand around?
It's 2023 how the hell is there still not a proper solution beyond carting sand up and down beaches

It is well established the sand drift has been going on for thousands of years (probably since Gulf St Vincent flooded around 9-12 thousand years ago). The sand is eroded from the southern beaches and deposited further north because of prevailing currents. This process has resulted in the creation of the Lefevre Peninsula in the last 5-6 thousand years, and its gradual northern extension. The peninsula is now continuing to extend northwards on the other side of the dredged Outer Harbor shipping channel, in an area known as the Section Bank. This is where sand is being collected to replenish the southern beaches. Without intervention, the Lefevre Peninsula will continue getting longer, potentially until it blocks Barker Inlet entirely, and links up with the coast north of St Kilda. These processes are natural, but they have been accelerated since settlement by building over the dunes and the death of the seagrass meadows which held the sand together.Adelaide coastline.jpgsection bank.jpg

Oh I had no idea it was impacting the inlet. Hopefully something permanent can be done to sort this out while we still have beaches and beaches to save.

So if "nothing is done", we'd end up with sandhills and sandy beaches instead of mud flats at St Kilda, Port Gawler etc. as part of the natural development of the coastline. Preventing nature from being natural in the way we want is expensive work - Hawaii coastline changed a few years ago when a volcanic eruption made a few acres of new land and boiled a freshwater lake on the way past.