Hydraulic jump, low head dam installation, and coarse sediment transport
ฝัง
- เผยแพร่เมื่อ 24 ก.พ. 2010
- River Geomorphology Video created by Little River Research and Design, with funding from the Missouri Department of Natural Resources. serc.carleton.edu/details/file...
As the clip opens you see shallow flow with uniform bedmaterial transport throughout. A small low head wier or dam is installed. This produces deep subcritical flow above the dam and critical flow over it. Below the dam we see supercritical flow.
The deeper, low velocity flow above the dam cannot move the coarse bedload (Q = VA, and since A is greatly increased and Q is unchanged above the dam, V is greatly decreased) and we see deposition occur until depth is shallow enough (and A small enough) that the increase in V moved bedload again. Deposition occurs to the top of the dam.
When the dam is installed, we see a classic disruption in sediment transport continuity. Coarse transport essentially ceases through the dam until deposition builds a higher streambed. Sediment is blown out below the dam (often scoured to bedrock in the real world) This is the well known "hungry water" effect seen below dams.
At low-water crossings in the Missouri Ozarks, many of which are essentially low dams, we often see this condition, manifested as a wide, sediment-filled channel with low banks upstream of the bridge. This contrasts with a deep, scoured channel below, sometimes with high, unstable banks.
At the end of the demonstration, the downstream gate is lowered and a hydraulic jump appears which is then drowned as stage increases. The depositional dune and slipface then move past the dam. The gate is then raised somewhat, allowing a jump to reform and sediment is blown out below the dam. - วิทยาศาสตร์และเทคโนโลยี
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I don't know what I just watched,but that was satisfying.
Could it be useful for gold panning
Beavers: “...just studying dams and scour effects, don’t mind us.”
You can see as the sediment is deposited downstream due to missed scheduled maintenance, the rolling boil of the waterfall gets closer to the dam. Right around 0:45 the drop isn't visible from the surface, but you can clearly see the current pulling the sand backwards towards the drop again, which is exactly what would happen to a boat or person. While sediment can build up and reduce that current in low water, as soon as high water comes it just pushes the sand away and reforms the hydraulic current.
@@lawrencescott2647 could also be useful for not dying.
Theres an example of an hydrolic jump but i forgot
TH-cam recommendations strike once again
Allways the same fking comments
Its actually really nice when this happens because it shows average people a cool phenomenon that they might not otherwise see or even ponder.
The only weirder thing than being suggested to randomly watch something like this, is that we actually do watch it
Me:
TH-cam:You need a basic understanding of how dams work.
Damn
I studied this in University. So at least that makes sense to me.
TH-cam recommendation brings us all together.
I don't know why that was so interesting but I was left thinking "maybe I can use this somehow."
This is what happens when you build a weir in a river used to carry little stones. River digs itself deep. :D
For irrigating yes, but i don’t suggest you making it big, because it’s fatal
Fluid dynamics is such a large field. When you think you understand the basics, something new is introduced.
Air is a fluid. 🤯
Planes are just sailing in more directions.
Shut up, your mom is a fluid.
Dozer1642 air isn’t fluid m8 fluid = liquid.
@@Viggggggr Somebody obviously didnt pay attention in basic science class. Air is considered a fluid. Unless you are trolling with sarcasm, in which case fuck you very kindly
Glas is fluid as well
The algorithm brings up something from my state that I’ve probably seen before at the science center. Nice
I studied this in hydraulics, very interesting to see again many years later
I have a question. Why is it, when the dam is installed, that de depth of the water behind the dam decreases? Because of the increased flow velocity? If so, why is it increased? Because of the new height difference or the angle of the dam?
Hella cool!!
The surface tension!!!
Something hypnotic about watching that sediment scour
I’m so mesmerized by the knowledge I’m gaining right now.
So glad I got to see this 9 years later
Nine years later... TH-cam recommendations
*10
For some reason, this is oddly satisfying to watch
Great demonstration!
Awesome Vdo for explanation
Its interesting to watch, but i would also like to see whats going on both upstream and downstream.
nice video
Vrlo dobro izvedeno
that's so cool man !! :D
While what goes on to the left upstream of the obstruction is interesting what goes on to the right is even more interesting. As the water falls from the the top of the obstruction it gains velocity and the momentum/Kinetic energy finds ahead of it a wall of water which in itself an obstruction. The high velocity water from the left upstream penetrates through the wall of water unseen to the right down stream and all this behaviour balances out where the kinetic energy high velocity on the left is changed to a lower velocity plus a new water head. This is in fact the water jump and not what goes on the left .
It can be seem coming from the right as the restriction on the right is increased and the water jump can be seen coming into the picture at 0:41. As the unseen restriction on the right is varied the hydraulic jump on the right attains a different distance from the immersed obstruction shown in the middle of the picture.
Beautiful dynamics from start to finish showing all the placement of the granules in the debris, Excellent video in every way. Congratulations.
Thats a great explanation! Had no clue what you are talking about tho
Well done!!!
I dont know what i am doing here, but thank you for the recomendation, i live for feeding my curiosity
i dont know about you guys, but i looked this up myself, idk why, but i find it amusing lmao
Nie wiem po co to obejrzałem ale spodobało mi się ;
Welp not sure why I watched this but TH-cam said I needed it so I feel satisfied now
Would the water tension be the same on a larger scale?
I'll take more of these videos please 👍👊
Isn't erosion facinating?
Fluid dynamics: the branch of science in which you can’t predict shit by mere intuition.
Very nice experiment. Which sediment did you use? Is that some kind of plastic? Because it's seems very light
This is my video, and yes, it is melamine plastic with a density of 1.7.
How do you instal these? Or connect them with the multibeamer ?
The behavior of flowing water is kinda fascinating to me.
Missouri department of resources you go gurl
What does it mean by “coarse sediment transport”?
Potential solution to coastal erosion?
awsome
Interesting for sure.
Yay I did understand any of it but it makes me feel smarter lol
Cool👍
This is just reminding me of my ecology and conservation subjects because the drastic changes in the river dynamics really fucks with animal species. Not only blocking them from migration upstream but changes in temperature and speed of the water are detrimentally to certain species.
Recommended
what am I looking at
Wow peacefull vdo
Nobody:
TH-cam recommendations:
Hydraulic jump
I have no clue what the fuck this is but still watching
M-a interesat din punct de vedere al combaterii inundațiilor.
I was in grade 5 when this video post ! Why this now in my recommendation?
TH-cam: this one right here champ
Why I'm here dear Recommendation?
Very clever.
What about fish going up stream?
NICE...
Cool❤
Drowning machine?
Explains why my toilet won't flush properly.
Too much sponge
great
I’ll add one of these after my gutter downspouts
Serious question : What, where, and when do we use this in real life?
this is cool
ig to see how low head dams are dangerous?
I use to do this when I was 6.
Thank you. Now I know the gold is where I drown.
As Einstein said when his mom took him to the beach , ' Epic ' .
Albert Einstein's son grew up to be a professor of hydraulic engineering, who specialized in sediment transport.
song name?
Me:
TH-cam recmds: water and hydraulics.
Me: 😑🤨😦🙂😊😁👍🏿
I’m no sure how I will use this on my daily basis
Kind of want an aquarium like that for hill stream fish. Could just cycle the water through filter media under the table and pump it back to the top. Of course you'd want it a little deeper on the head end for some small fish and then maybe some frogs could live in the shallow runoff end before it fell through a screen into a sump... if only I had building skills, or money, or ambition.
I was thinking about surfing on that strong current. Anybody???
Context please?
This was satisfying to watch
Why am I here 10 years too late
Thanks TH-cam, now I have to watch the next recommended video, what is a hydraulic jump.
Notice how this only works on a flat plain...
Is this how fossil are made?
Um, thank you?
Imagine solving fluids and hydraulics.
no
I agree
I concur
Really?
Pero solo con flujo laminar
I was hoping the obstruction was defeated in the end
Algorithm, why?
In Loooovveeeee
10 years omg
Me until 0:07, where is this rock going.
I dont understand
Why am i watching this at 3am
I think TH-cam recommended is trying to tell us all something
If it keeps o raining levees gonna break...
🧐..TH-cam recommenced...WTF🙄👉.. clicks 😟😳😌SATISFYING.
YOURE A WIZARD
Looks like only i searched for this🤣🤣🤣
Alright guy see u im 10 years
oh
Well hello there fellows
You'll watch anything while Half asleep.
Iam so lost what is this for 😂
It's a hydraulic jump demonstration. A low head dam that builds potential energy.
Good will not flood .
If stone=stone ragged
Cool, but what??
But why
A hydraulic jump. It's a sort of dam that builds potential energy.
Это изобретение Леонаодо да Винчи