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.

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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..."

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

Great responsibility!

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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
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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
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mowgli commented Wednesday, 23 Sep 2020 at 5:12pm

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.

nah....yeah...but, nah

Distracted's picture
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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...

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

nah....yeah...but, nah

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.

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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.

nah....yeah...but, nah

velocityjohnno's picture
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velocityjohnno commented Wednesday, 29 Jan 2020 at 6:42pm

Stu asked me on the EAC article if I had seen Crikey's 'Collapsing Coast' series, linked here:

https://www.crikey.com.au/the-collapsing-coast/

Some reading to go through. Searching for it I came across a 2008 article from the other surf site:

https://www.coastalwatch.com/environment/4524/the-impact-of-coastal-eros...

Question: do any of you live near the spots in the CW article? Have they changed since 2008?

I'll get into reading all that above tonight. One thing I'm wondering Stu, would there be any benefit in identifying a 'control' beach that is not featured in development (or marram) or anything silly we have introduced? If so, how is that changing?

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stunet commented Wednesday, 29 Jan 2020 at 7:24pm

VJ,

I was a bit disappointed by the Inq coverage TBH. Thought it would be more in depth, you'll get a better analysis in our forums and comments.

As for a control beach: Maybe for future forecast changes - i.e sea level rise - but all the erosion to date is human-induced so not sure there'd be any purpose of control data?

Also, each example is very individual. Humans have found myriad ways to screw to coastal zone.

 

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velocityjohnno commented Wednesday, 29 Jan 2020 at 8:37pm

Agree, and that's a huge compliment to the information here at Swellnet!

As for the control beach, I was thinking of the one I sent you the pic of - no marram, very little human input, blowout present in the dunes, gradual slope presents opportunity of well defined and shaped waves. A long term view of this beach - which will be changing itself as the dunal plants colonise and then get wiped back - might give a better view of the sea level rise? Dunno if the land there is elevating or sinking.

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stunet commented Thursday, 30 Jan 2020 at 10:22am

Yeah, in terms of sea level rise, an untouched beach may be good. Though from what I understand, sea level rise will be erratic, not the same around Australia or the world, so perhaps it might come down to some places faring better than others irrespective of how original and intact it is.

Not sure, just spitballing.

truebluebasher's picture
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truebluebasher commented Saturday, 29 Feb 2020 at 1:37pm

Downunder Qldurr goes bananas at Troppo Climate Change report !

2011 Queensland Coastal Processes and Climate Change

Page 22 [ Qld Map ] > " Vulnerability to Varying Influence of Climate Change "

*SEQ - Minor Tidal Influence > (Minor = Drowning in a rising sea of 1-100 Floods)
*SEQ - Minor Cyclone Threat > (Minor = Sydney Cyclone Siren needs new batteries)
*Townsville - Minor Tidal Influence > (Minor = Noah: "Worst Flood ever on Earth!")

https://data.longpaddock.qld.gov.au/static/about/publications/pdf/qld-co...

Tbb advises to get a bigger Black texta & don't stop until all Of Qld is coloured in!

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velocityjohnno commented Wednesday, 27 May 2020 at 1:54pm

Coastal erosion after the Big Saturday and Sunday swell for NSW/QLD May 2020:

https://www.willyweather.com.au/news/12776/midcoast+council+issues+warni...

Down here in Vic we've had a good run of swell and I'm beginning to see the winter eating of the foredune (tall, upright foredune thanks Marram grass...) which seems relatively normal.

East Coast crew: anything radically different for your local after this swell?

mowgli's picture
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mowgli commented Wednesday, 15 Jul 2020 at 3:30pm

How are things looking around Sydney/Central Coast this week?

nah....yeah...but, nah

truebluebasher's picture
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truebluebasher commented Wednesday, 15 Jul 2020 at 8:00pm

Perfect Timing mowgli..
Stockton Erosion turned out to be a living local history treasure trove.
Grom refashions the Erosion & Lockdown into a 300y/old Time Machine
https://www.youtube.com/watch?v=29SfNuvvxbs

Council have equally cool "Story Maps" for the erosion.
https://storymaps.arcgis.com/stories/75f46591f216484597cdcafc14fd8131

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shoredump commented Friday, 17 Jul 2020 at 10:21am

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mowgli commented Wednesday, 23 Sep 2020 at 5:13pm

Thanks TBB.

The site is interesting....

nah....yeah...but, nah

truebluebasher's picture
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truebluebasher commented Friday, 17 Jul 2020 at 6:33pm

NSW Central Coast (Recent erosion + Up dates)

4th June 2020 ECL - Old Bar
https://www.nbnnews.com.au/2020/06/04/council-looking-into-another-sand-...

Wamberal
June 2016 ECL
https://www.dailytelegraph.com.au/newslocal/central-coast/major-erosion-...
July 2017
https://www.nbnnews.com.au/2017/07/23/wamberal-residents-meet-over-erosion/

29th May 2020 ECL - NBN [ Video 2 mins ]
https://www.nbnnews.com.au/2020/05/29/wamberal-residents-call-for-sea-wa...

13 July 2020 Pre ECL - (Massive Snow-Hail Dump) Central Coast.
https://www.nbnnews.com.au/2020/07/13/wild-weather-white-christmas-in-ju...

14th July - Big Bombora Sets [ 11.6m ] (Cowabunga)
https://www.facebook.com/abccentralcoast/posts/3740393542642794

(current) re: shoredump's photo..(Now a Big News Story)

17th July 2020 ECL
https://thenewdaily.com.au/news/state/nsw/2020/07/17/central-coast-erosi...

CCN TV : Lead Report
https://coastcommunitynews.com.au/central-coast/news/2020/07/weekly-vide...

Wamberal (7)news [10 min Video]
https://www.facebook.com/7NEWSsydney/videos/764108207673453/
[0: 45]
https://www.facebook.com/7NewsAustralia/videos/evacuation-warning-after-...

Bigger tides tonight...

Bonus : 2020 ECL (Blooper)
Avoca: One of Craig's puny 'infragravity waves' hits pay dirt...(Oh! The Carnage!)
https://www.facebook.com/abccentralcoast/videos/611200963141073/