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Water displacement.
- Thread starter noseall
- Start date
your obsessed with having the water filled with canal 
thanks guys, clear as mud. 
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A decent example...
http://www.answers.com/topic/falkirk-wheel
Another :-
http://www.answers.com/topic/anderton-boat-lift
8)
http://www.answers.com/topic/falkirk-wheel
Another :-
http://www.answers.com/topic/anderton-boat-lift
8)
Here's the fly in the ointment. The barge is moving. It has a bow wave. The water pressure just ahead of the barge rises as it approaches and increases the load on the aquaduct AT THAT POINT.
Although it's not so easy to see, the barge also has a stern wave.
It might be upside down but it's still a wave! 
The water pressure behind the barge is reduced as it passes and so the load on the aquaduct goes down.
Now I put it to you - and I hope some mechanical engineer will back me up here - that a moving load is potentially more damaging to the aquaduct than a static one.
PS: The bow wave is the important one. A water wave that sticks up is always trying to fall over itself because the water at the top wants to travel faster than the water at the bottom. The stern 'wave' dissipates naturally because the water at the bottom lags behind the rest. Try it in the bath if you don't believe me.
PPS: A few posts back, somebody said something about viaducts. What have railway bridges got to do with this?
The barge is moving. It has a bow wave. The water pressure just ahead of the barge rises as it approaches and increases the load on the aquaduct AT THAT POINT.Although it's not so easy to see, the barge also has a stern wave.
It might be upside down but it's still a wave! The water pressure behind the barge is reduced as it passes and so the load on the aquaduct goes down. Now I put it to you - and I hope some mechanical engineer will back me up here - that a moving load is potentially more damaging to the aquaduct than a static one.
PS: The bow wave is the important one. A water wave that sticks up is always trying to fall over itself because the water at the top wants to travel faster than the water at the bottom. The stern 'wave' dissipates naturally because the water at the bottom lags behind the rest. Try it in the bath if you don't believe me.
PPS: A few posts back, somebody said something about viaducts. What have railway bridges got to do with this?
I can't tell if you're joking or you really believe that you can increase water pressure in a certain small part of a canal.
I'm trying to visualise an open-topped vessel of water, with a flat and level bottom. At point "A" on the bottom the water pressure is 5 psi
What is the water pressure at points B, C, D, E etc, at the same level?
I'm trying to visualise an open-topped vessel of water, with a flat and level bottom. At point "A" on the bottom the water pressure is 5 psi
What is the water pressure at points B, C, D, E etc, at the same level?
If those points are at the same level as point A, the pressure at the bottom will be still be 5 psi. But the water level in front of the barge is higher.
Unfortunately you've got me thinking now because the water in a wave is also moving - and not just at the top.
If you could view the wave motion end-on you would see that the water was moving in a circle; falling in front of the wave and rising behind it. It's been too many years since I tangled with the mathematics of water waves (try searching for Korteweg d'Vries equation) but I think I'm right. The pressure at the bottom increases as the bow wave passes over. and how do you increase the pressure in one part of a open vessell?
can anyone answer this?
