Classic problems of open channel flow

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is there an intuitive way to describe this?

>>8683558
give me more info

>>8683585

Look at the pictures, they are a side view of an open channel with water flowing left to right. When there is an obstruction in the water you intuitively think that the water elevation would rise over it, but instead it drops lower. Vice versa as well.

>>8683578
I'm guessing that as the water hits the depression it slows down, which allows it to build up. Vice versa for >>8683558
I'm not sure why this occurs though.

>>8683628

Yeah but it would slow down even if the water level didn't rise because of the increased cross sectional area, that doesn't explain why it needs to slow even more by rising.

>>8683617
narrowing of the channel increases the velocity of the flow which results in lower static pressure so the water level drops, and vice versa. have you never seen a venturi tube, you dumb fag?

>>8683634

I don't think this is quite right, pressure is not used in open channel flow because the pressure is the same at every location (1 atm), it's not the same as a venturi tube or a pressurized pipe.

>>8683646
total pressure stays the same, but the static pressure drops while dynamic pressure increases.

you must be a civil engineering student to be this retarded.

>>8683634
>>8683648
>dumb fag
>retarded
cheer up m80

I like your style tho, I too often insult people whom I help

>>8683632
No what I'm saying is the water slows down (I guess because of the larger cross section), which means that water flowing in from behind will begin to pile up on top of the water thats slowed down.
Or this >>8683634

>>8683648

This is wrong, you can't just use continuity equation and Bernoulli to solve, I just checked.

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>>8683648

>he literally thinks that energy is constant along the streamline in open channel flow while insulting civil students at the same time

holy fuck mein sides

>>8683558

This is interesting. So how does the shape of the obstruction effect this? Do you see a mirror of the obstruction's shape on the surface like that? Is that the only shape that does this?

>>8683736

It appears that all that matters is the depth of flow, there really is a lot more to it than meets the eye

youtube.com/watch?v=v5gXfyViGIE

>>8684004

This one is is closer to OP

https://www.youtube.com/watch?v=VDkoWcD5RYM

>>8683558
>>8683578
turbulence and vortices but even the smartest minds have failed to explain everything revolving around this phenomena, let alone predict it.