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, 9 Nov 2019 at 11:27am

LD - probably did handle them briefly, within the context of lab work. And was also on site, but I won'd disclose which/where, respecting the clients. I'd assume it would be similar across many operations like this world-wide, and that some sands (as well as granite, for example) possess a slight radioactivity. The doing bit was my job - I loved that line of work, all the travel, new sites, new people, remote work.
And yes, you get to see things occasionally that make you go "Whoa!" Exposure to many substances will have safe "limits" usually imposed after much study, and I'm happy I was within those limits. Er, hopefully...

What I'd like to say is: "The radioactive sands... changed me and gave me super-powers. I can now look through clothing pieces. I now act tirelessly for the greater good, only choosing when to use my powers with great restraint." As Leslie Nielsen said: "With great power, comes..."

Lanky Dean's picture
Lanky Dean's picture
Lanky Dean commented Saturday, 9 Nov 2019 at 4:03pm

Great responsibility!

velocityjohnno's picture
velocityjohnno's picture
velocityjohnno commented Sunday, 10 Nov 2019 at 2:29pm

Absolutely!
Original clip:
https://www.youtube.com/watch?v=rfBFnvb6NOM
And a bonus, pretty dangerous in coastal dune systems:
https://www.youtube.com/watch?v=ZzTYYtYq0YY

morg's picture
morg's picture
morg commented Tuesday, 12 Nov 2019 at 1:04pm

At a more localised level around Newcastle, a few of us have a theory that in addition to the sand dune stabilisation (e.g. Nobbys) and shore stabilisation along Merewether/Bar Beach stretch, the restricted stormwater outflow onto the beaches has also adversely impacted the sand banks and waves. For example back in the day there were pretty consistent left and rights directly off the drain outflows at Merewether, South Bar, Southey, and Newcastle. Just a theory, but appears to be more than coincidental. As a side note the the restricted freshwater outflow has also contributed to the lower level of oysters around the rocks these days (change in salinity for spawning).

mowgli's picture
mowgli's picture
mowgli commented Wednesday, 27 Nov 2019 at 4:42pm

One thing to be mindful of when comparing the beach condition you see now with what you knew it to be decades ago....what you're seeing now could very well be the "natural" (i.e. closer to the long term/steady beach state) and what you recall as being all-time in your younger years may have been in a post-storm/early recovery phase.

As for groyne suddenly turning on ya...same rule applies, it can take 30 years for the consequences of a specific change to fully play out.

The reasons for these vary greatly.

As for radioactive sand....firstly, if you touched it surely that means you've grown a big blue dong a-la-Dr Manhattan? secondly...the old man was in that industry for a while (rutile sands, not dongs) and said there's "radioactive" waste product in landscaping products (yes, sporting field and backyard soil included) all over SEQ and N-NSW....a few attempts to raise awareness of it in the Courier Mail a while back mysteriously shut up shop pretty quick...

“Life is a long lesson in humility.”

Distracted's picture
Distracted's picture
Distracted commented Wednesday, 27 Nov 2019 at 9:41pm

VJ, any thoughts on use of tank traps as a coastal erosion measure plus anti-SUP device ;-) as opposed to the relatively harmless marram grass!

On a serious note does pretty sound dangerous and it is also interesting that they are being exposed as at some point that must have been the natural beach profile.

https://au.news.yahoo.com/potentially-fatal-hazard-exposed-on-popular-be...

mowgli's picture
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mowgli commented Tuesday, 3 Dec 2019 at 1:32pm

“Life is a long lesson in humility.”

velocityjohnno's picture
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velocityjohnno commented Tuesday, 3 Dec 2019 at 6:41pm

Just saw your tank-trap post Distracted, I admit I had to look the term up. As suspected, they are barricades to stop tanks! One thing that's interesting is that they were buried and are re-exposed, which suggests the coastline profile was more receded in the 1940s? Maybe something happened after then to build up sand over the traps?
Around here, we have these wooden barriers extending out into the sea at the TQ front beach. When the sand is taken away (like now, with all the Sudden-Stratospheric-Warming related Westerlies and large out-of-season swells associated) they become an obstacle for logs/SUPs/groms at one of the fav grommie spots. Not too nice to ride into one at high tide!
I always thought that if someone could design an ocean version of a snow groomer, they could be put to work on little days, create great A frames, and employ the local stoners, all in one hit.
Mowgli, about radioactivity and big blue dongs, just checked and it's not blue. So I'm OK I think. Also, don't use FB so haven't seen it. The only FB link I've ever clicked on is "AU Falcons doing incredible things", which is pretty inspiring.

mowgli's picture
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mowgli commented Wednesday, 4 Dec 2019 at 10:41am

From memory the 30s saw some whoppa tropical storms so that may explain denuded beach systems in the 40s. The ones up here on hte sunny coast really only achieved a "recovered state" from the high cyclonic activity of the 70s in the '00s.

“Life is a long lesson in humility.”