Who knows

[Highway Man]

A Reform supporter says: “I don’t listen to facts, I prefer blind faith and prejuduce”

We know this, you don't have to make such a confession.

 

[MNW67]

And nope I'm not having any of it more weight on the bridge is more weight on the supports...

Right now the mods can shut this down...

No, I simply can't accept that. I won't be able to go for my nap until I know you have understood it!

But seriously, I'll just have one last go!

The point is that there isn't more weight on the bridge. One weight (some of the water) has simply been replaced with another weight (the boat). It's like if you had four 1kg bags of flour on a weighing scale. And you added a 1kg bag of sugar. But then you removed one of the bags of flour. You would still end up with the scale saying 4kg.

 

[JohnD]

"hump" speed, you are carrying significantly more water.

But you surely not going to pretend that a column of extra weight extends underneath the ship that would press on the seabed or a fish or djver beneath. Nor will moving ships make the sea heavier.

There isn't.

"Any wave caused by the moving vessel will load the aqueduct.

and what will the hollow behind it do?

 

[Justin Passing]

and what will the hollow behind it do?

It sucks, obviously .

Actually a temporal perturbation in the space time continuum. Or you could say the gravity is stronger there, so it pulls the water down more.

 

[Highway Man]

Pop a 6" nail into the sea bed by an inch. Then take any hammer you choose and go to hit the nail on the head but stop before the hammer strikes the nail. Would the pressure drive the nail into the sea bed?

 

[MNW67]

Pop a 6" nail into the sea bed by an inch. Then take any hammer you choose and go to hit the nail on the head but stop before the hammer strikes the nail. Would the pressure drive the nail into the sea bed?

I am guessing the answer is yes. But I have no idea why!

 

[pete01]

Pop a 6" nail into the sea bed by an inch. Then take any hammer you choose and go to hit the nail on the head but stop before the hammer strikes the nail. Would the pressure drive the nail into the sea bed?

Why would I put a nail into the sea bed?

 

[Highway Man]

I am guessing the answer is yes. But I have no idea why!

I shall reveal the answer shortly

 

[Brigadier]

But have you been diving in aqueducts ?

More, bog snorkeling

 

[Highway Man]

But have you been diving in aqueducts ?

actually no, not much call for sat divers in those

 

[blup]

Yes, but not the full weight/force because some of the displaced water will be forced along the entrance/exit to the aqueduct .

 

[Justin Passing]

Pop a 6" nail into the sea bed by an inch. Then take any hammer you choose and go to hit the nail on the head but stop before the hammer strikes the nail. Would the pressure drive the nail into the sea bed?

No, unless you were moving the hammer incredibly quickly and got within a micron of touching the nail. (say)
Then the water wouldn't have time to get out of the way so the water momentum/shock wave might move the nail. Water hammer! Hydraulic shock...
Impulses of pressure in pipes can do odd things like that, such as blow a sharp elbow connection off. You can get special elbows with a bracket built in for that. It has to withstand far more than the weight of the pipe.
It's similar in principle to "contre-coup" injuries to someone's head. Hit someone with a hammer/scaffold pole etc and the shock wave can move the liquid-ish contents and damage it or even fracture their skull on the opposite side. Bullets do interesting things like that, there's a certain website which has demonstrations kindly set up for you by Mexican drug gangs with a grudge.

Those are all closed systems, where the water (etc) can flow, but the shock wave is very directional so it has most effect IN that direction.

There's also a drain-clearing thing which works in a similar way. Imagine a waste pipe with water and air pockets, and a "soft blockage" or say a towel blocking it. You pump up the Thing , pull the ttrigger and it smacks the water (or air, but water works better) at your end of the pipe. The impulse travels through the water and air in the pipe, and the blockage moves a little bit. I've seen it in transparent pipes, The air doesn't visibly compress, or even move. Impressive.

I'm sure I've seen examples on ships, and or military applications. I'll be very disappoiinted if HM can't show anl array of photos!!

The common thing, is the shock being surprisingly transmitted through liquid.

I've thought of a couple more, of breaking glass under water at a distance, and boiling water in the middle of a fish tank using ultrasonics, but....

 

[Highway Man]

No, unless you were moving the hammer incredibly quickly and got within a micron of touching the nail. (say)
Then the water wouldn't have time to get out of the way so the water momentum/shock wave might move the nail. Water hammer! Hydraulic shock...
Impulses of pressure in pipes can do odd things like that, such as blow a sharp elbow connection off. You can get special elbows with a bracket built in for that. It has to withstand far more than the weight of the pipe.
It's similar in principle to "contre-coup" injuries to someone's head. Hit someone with a hammer/scaffold pole etc and the shock wave can move the liquid-ish contents and damage it or even fracture their skull on the opposite side. Bullets do interesting things like that, there's a certain website which has demonstrations kindly set up for you by Mexican drug gangs with a grudge.

Those are all closed systems, where the water (etc) can flow, but the shock wave is very directional so it has most effect IN that direction.
There's a drain-clearing thing which works in a similar way. Imagine a waste pipe with water and air pockets, and a "soft blockage" or say a towel blocking it. Yo pump up the Thing , pull the ttrigger and it SMACKS THE WATER (OR AIR, WATER WORKS BETTER) AT YOUR END OF THEPIPE.

I'm sure I've seen examples on ships, and or military applications. I'll be very diapposinted if HM can't show his usual array of photos!!

The common thing, is the shock being transmitted through liquid.

It is called a gallow gun.

 

[Justin Passing]

It is called a gallow gun.

That's the kiddie, or close to it. The one I have in mind is pumped up manually rather than using CO2, but similar idea..

 

[motorbiking]

But you surely not going to pretend that a column of extra weight extends underneath the ship that would press on the seabed or a fish or djver beneath. Nor will moving ships make the sea heavier.

There isn't.



and what will the hollow behind it do?

You seem to be struggling to understand the difference between a body of water of around 50,000 tonnes and one of a trillion tonnes.

The physics is well established, how much of a difference it makes is dependent on the size of the “system”.

It doesn’t make any difference if the barge is floating above the bridge or in another part of the canal. Unless the barge is moving and creating a wave.