Erosion can be caused by Global Warming

Marcus John Knight By Marcus John Knight, 18th Oct 2014 | Follow this author | RSS Feed
Posted in Wikinut>Writing>General Non-Fiction

Sea Level rise's among the Estuarine habitat around Australia is staying longer over the mud flat areas not allowing for the time of drying between large tides like king tides compared to some ten years ago. This in return has caused collapsing of banks due to the extra weight

Creek bank collapsing syndrome over saturation

I have visited a couple areas of Port Alma over the last 20 years fossil collecting crabbing and fishing, 10 years ago there were rocky areas along the banks where I had put parallel oyster covered rock's to catch sub fossil's and fossils and have oysters to eat each time I went there. The Oysters and Scallops were thriving and one got cut feet a couple time's taking of one boot for awhile The gravel areas had thousands of small scallops some were edible size, those were the good times. Then it suddenly changed with the oysters and scallops dying from what could only work out was the new silt that came to smother them from only small chunks of mud falling and breaking up.
In one area which seemed a bit slippery to cover at low tide level I had a pathway through the mangroves above, I just went through and cut branches of the mangroves which let me walk through nice and easy a bit of a zigzag but least at high tide I was up out of crocodile's way but now the track area which was least 2>3 meters away from the original l river bank. Now 12 months later it has slowly broken away in chunks mangroves and all ended up into the Casuarina Creek taking crab holes and tree's now minus a few more species.
The bank collapsing effect only started a couple chunks at a time at first the fine slurry it created killed the scallops and oysters, there was still beds of rocks in all area's which have now been ploughed into the creek.
Nowadays it is gravel coated slush in some areas with the majority of areas with massive chunk breaking pieces of banks with hundreds of small mangroves subsiding into the creek system ploughing away most gravel beds. On the corner where I can't walk anymore there is a little outlet stream that fed a really deep hole of water I once fell down in it by stepping off the edge with a crab pot putting it in and sunk a long way to icy cold waters there is wedding ring down there somewhere it got tore off my finger with letting go of the heavy pot . I think the hole will be now filling up with slurry and the best fossils. I never found, according to the tidal wash patterns I have been studying to better find the fossils. A big crocodile ventures this hole too I have noticed seen some of its skid marks on the banks around, scarred my dog one night when I threw a ginny crab back in the water with the bang noise it made taking the crab my poor dog nearly broke the rope.
I found one is usually safer in the daytime from large crocodiles it is usually too hot and the odd outboard motor boat coming up the creek will have them sleeping up in the dense mangrove areas. I must admit I do venture the water a lot putting crab pots in only the in a bit, dragging out is wise.
My explanation for the Creekbank collapsing I find in both creek systems Casuarina and Inkerman creek which are close together in this area is because the pan areas are being wetter for longer periods of time than years ago and this just cause's them to get too heavy and fall in.
There is not a great deal of recreational fisherman in Casuarina so one has discounted bow wave from boats as being a factor also boats were there before the erosion started massively happening.
The creek is accessed from the Port but is restricted at time's of high winds and most people that do come here to set their pots are from Thompson point in the Fitzroy River.
The increase in Heavy Vehicle traffic along the port road I thought sending ripples across the mud pans but some areas just seem too far away from the road to have any sort of ripple effect that would dislodge such large chunks of earth. This dislodging of large chunks of the bank is not only in steep areas where all the mangrove growth is but also in the more moderate sloping area's also further up the Casuarina creek over a mile or more away from the highway area.
There are some maffic areas down this way maybe the faults were shaking once in a while but the bank areas near the faults had crumbled some seem to have eroded but no more than further away mud banks.
The effect of this erosion could be not just localized to me finding less fossils but sedimentation which would eventually spread out to the Reef maybe after some small flooding event meantime it will just silt up the existing areas with submerged mangroves a boating hazard maybe. Flood events have been that erosive in the times I had ventured there after major rain events it was the best time to find new items ripped from the peat beds.
Anyway, one is getting too old to be active in this area forever more, the mud soft spots mean to many falls nearly put my broken hip out least wore some callus of it.
The peat areas which jut down into both the creeks seem to be the much stronger area's the mud there is much oilier and sticky and are only ever good to fossils after severe rain events and they are becoming years apart as time goes by. The banks will keep collapsing and the once deep creek will become much a shallow situation.
I gather this erosion would be happening in most major estuarine habitats along the coast and would be contributing a bonus silt runoff with the soil from the already disturbed land from farming and mining all will eventually cover seagrasses and corals the 30 ft Bream < see my other blog> that is supposed to swim these water will be extinct.

On a recent trip to Bowen and exploration of North heads where one used to play in the sand dunes one now has noticed huge erosion of rocks and ancient corals among the banks of the Flagstaff hill which weren't evident to me many years ago now all this Ancient Heritage of Aboriginal artifacts and sub fossils is being taken into the sea to be destroyed eventually over time. the blog below has some comprehensive photo's of this area and others.


Global Change, Global Warming

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author avatar Marcus John Knight
Environmentalist with interest in Geology and Paleontology

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author avatar Sivaramakrishnan A
19th Oct 2014 (#)

Weather is changing, becoming hotter in Asia - siva

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