Longitudinal Dune truncated by rising sea levels, Cooloola National Park, Queensland

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Comments (12)

Tewbacka on November 8, 2012

An interesting angle to see the erosion Ian. Drove right by it and didn't notice it. Whoops!!. Great photo Like

bdeh on November 8, 2012

That's a lot of erosion taken place there Ian. We try to stop this by making the level of the beaches higher. Greetings Berend

Ian Stehbens on November 9, 2012

So Gary, you need eyes to see with!! Isn't it a wonderful part of the world. By the way, the erosion is mostly ancient, from a time when your part of the world had glaciers. Then there was much sand to move around, as sea level was lower. As sea level has risen the long dunes have been truncated, here at there far end by the waves and currents in the bay. What is interesting, if one has the time to look, is that the structure of the dune is exposed as its end is eroded.

Regards,

Ian

Ian Stehbens on November 9, 2012

Hello Berend.

The sort of erosion we are talking about here is the similar to the erosion that created the muds and deposits on which Netherlands is established. Ancient erosion primarily, since the lower sea levels of the last ice age.

Then there is the natural northward flow of sand in the surfzone, that supplies most of the sand to the beaches and into the bays as here.

The best process is to maintain the natural flows, then the beaches, for example tend to remain where they are, with only natural seasonal fluctuations.

That is the beauty of such large ecosystems as Cooloola and Fraser Island.

Cheers,

Ian

bdeh on November 9, 2012

We got another flow after finishing the Delta dikes Ian, therefore we supply some beaches with sand. Greetings Berend

S@ndro Cressi © on November 9, 2012

great shot , wonderful image !!

like

S@ndro

Ian Stehbens on November 10, 2012

Thanks for your additional comment, Berend. Sand pumping is used along the coast at various points. Mostly it is done to keep harbour entrances open, and in some cases to replenish beaches at the southern end of a section of coast after storms, these two interventions being combined quite often. The two purposes are used to move sand past the Tweed River mouth replenishing southern Gold Coast beaches at Greenmount and Kirra, for example. The Mooloolah River mouth is also dredged and the sand pumped onto the southern end of Mooloolaba Beach.

Ian Stehbens on November 10, 2012

Thanks S@ndro. I am glad you have appreciated this landscape.

Ian

ebi lutze on November 13, 2012

Hi Ian From the group A1- Unique Australia. Definitive on the * to go there list * next time in queensland. **L. Regards Ebi

Ahmet Bekir on November 20, 2012

Like 5

frodo11 on June 22, 2013

I believe this particular erosion is from ignorant park users driving vehicles along the beach on the top half of the tide and the subsequent damage done to the vegetation and from the removal of the vegetation by vandals for firewood. What is the accepted figure for the rise in sea level over the last 30 years at this location ? Has the chart for this area AUS4602 been adjusted for this rise ?

Ian Stehbens on June 23, 2013

Thanks frodo11 for your sharing concern about use and abuse of this fragile ecosystem. The ignorance that results in damage to the vegetation and destabilization of the sand cliffs is a real concern that I share with you.

My comments above about the sort and scale of erosion here refers to the way the sand cliffs were formed in the first place. This cross-sectional view of a longitudinal dune that was probably at least a kilometre longer, when it was formed during the last ice age, reveals the structure of the dune. It is very fragile and the erosion we witness in our life time is due to the human disturbance that worries both of us, and also to storm events when breaking waves reach the base of the sand cliffs.

By the way, welcome to Panoramio.

Ian

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Photo taken in Great Sandy National Park, Rainbow Beach - Double Island Point Road, Cooloola QLD 4580, Australia

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  • Uploaded on November 7, 2012
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    by Ian Stehbens

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