Nullaki (Wilson Inlet) Sandbar Opening 2023
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- Опубліковано 7 сер 2023
- On Thursday 29 June 2023, Nullaki (Wilson Inlet) was opened. Wilson Inlet is located near the town of Denmark, on the south coast of Western Australia. The water level was approximately 1.27 mAHD at the time of opening. The channel was cut approximately 100 m from the western cliffs’ reference point.
By Friday 30 June, the outgoing flow had scoured the bar to a width of about 100 m. About 27 GL of water was discharged into the ocean in the first 24 hours after opening.
For more information visit: estuaries.dwer.wa.gov.au/estu... and estuaries.dwer.wa.gov.au/estu...
Imagery of the opening was captured by Department of Water and Environmental Regulation staff members, Cassie Paxman and Alex Burgoyne.
#DWERatWork #HealthyEstuariesWA #Estuaries #WAestuaries #WesternAustralia #DenmarkWA #OceanBeach #Inlet #sandbar #river #riverbreak #mouthopening
The drone footage was amazing! *I have the deepest respect for the power of water.* Thank you for the video.
I love these. I wonder what effect releasing all that tannin from the " tea " water does to coastal sea life.
Within a couple of hours the chlorine in the sea bleaches all the tannins out.....
One work - 100 looking
Must be a union job.
how long antill the water level is at a relative wquilibrium ?
How long the water takes to reach equilibrium with the ocean depends on several factors including rainfall (which influences how much river flow continues to enter the estuary). In 2023 it took approximately two weeks for the inlet and ocean to reach equilibrium.
Will this still be open January 2024?
What is the purpose/reasoning for this? Benefits, impacts, etc?
Essentially, Why?
Is it necessary for what reason?
Thank you.
Flooding! Won’t be long and it will always be clear and always flooded though.
The sandbar is opened to prevent flooding of low-lying land. If the sandbar is not opened then private and public land, including several roads, could be underwater. The inlet has been opened in this way for more than 100 years and many aspects of the inlet’s ecology (like fish, seagrass and birds) now rely on regular openings of the sandbar.
Was that a fresh water lake being opened to the sea?
the inlet is estuarine, so salt water
@@finnvogler5346: how did it come to be at a higher than tide level? I mean if it was connected to the sea it would be the same level as the sea.
@@AngloSaxon-yx8tk it has two rivers that feed into it, I suspect that causes the inlet to rise
@@finnvogler5346: Well in order for the inlet to rise, because of two rivers feeding it, the estuary must be blocked off causing it to rise and it's probably because the wave action from the sea causes sand build up where they open it with the diggers. Surely that must be the reason.
How can this ever naturally breach?
Flood waters each and every year....but this area has been in relative drought for almost 100 years.
I've seen many videos on You Tube showing the opening of this sand bar practically every year. What I wonder, is why the waste of time, effort, and energy to dig a channel 100 yards into the estuary? If you just dig out the sand bar from the estuary to the ocean, the flow will erode a natural channel. As it is, the outgoing flow basically ignores the channel that has been dug and erodes away the rest of the sand bar and the channels that were dug. Lot of extra effort put in that nature does for free.
Simple enough I'd have thought. The freshwater channel has to be dug back into deep water to ensure there's enough flow to scour a channel. Not far enough and it'll stall as the level drops.
The sand bar forms over the year. It creates a dam that prevents the river from draining to the sea. If you see how much area is flooded at the start of the video and how many feet it drops at the end of the video. There is a copse of woods that you can barely see the tops of the trees and shrubs. At the end of the video you can see the shore of this little delta island.
I found this video ua-cam.com/video/NQ9Y_Ncld58/v-deo.htmlsi=EBlIPGxN448rHyOm that explains
Digging at an angle protects the channel from wave action that is dumping sand back into the channel and trying to block it up.
As the channel deepens through scouring action that overwhelms the wave action.......
@@JohnSmith-pl2bk In theory. But in practicality, the dug channel would very easily out pace any deposition, as is shown by the video from the next day. The outflow is more powerful than the deposition. Now that changes as soon as a storm comes in and starts depositing new sand.
Just lay a pipe so that the two are constantly connected
Enough with changing the names. Fair Dinkum.
Never swim near one of these, the water is often badly polluted
Takes an army of gov employees to open a river mouth. Few dudes with shovels and jobs done. Typical government overspending.
Digging at an angle protects the channel from wave action that is dumping sand back into the channel and trying to block it up.
As the channel deepens through scouring action that overwhelms the wave action.......
@@JohnSmith-pl2bk with no water flowing from rain into the rivers it does not work.
@@westaussieeggs8867
The "normal" scouring action of a swift running river does by sheer force usually keep the mouth open...but can also result in a "bar"
...
I agree stagnant/slow water won't normally keep the mouth open....
but this coast also has a huge amount of sand and gravel being washed with the current flow IN THE SEA....
which can overcome a river flow....
help from a digger getting a break through at low tide allows stagnant water that has built up a "head" to carve a way through the sand bank...
and also allows subsequent rainfall to keep it open to keep draining the rainfall thus preventing flooding...