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re: is it true that the river will wash away sediment when it....
Posted on 5/23/11 at 10:47 am to PaddlingTiger
Posted on 5/23/11 at 10:47 am to PaddlingTiger
I understand the principle. But his example was horrible and more aptly described erosion than Bernoulli's principle. And I don't think I was the only one that reached that conclusion.
Also, you did a much better job explaining the principle than he did. And your explanation does explain how planes fly.
Also, you did a much better job explaining the principle than he did. And your explanation does explain how planes fly.
1
Posted on 5/23/11 at 12:49 pm to catholictigerfan
Thats a lot of pressure on those levees. Spots on those levees will have to be repaired after the water recedes. I live in a town where the river flooded twice in a 12 month period 2 years ago . It took its toll on the weak spots and they had to be repaired.
This post was edited on 5/23/11 at 12:50 pm
Posted on 5/23/11 at 1:11 pm to PaddlingTiger
What is so hard to understand about this? It has nothing to do with the speed of the water in the river. It has to do with the level of the water inside the levee vs level of the water in the river.
Posted on 5/23/11 at 5:53 pm to bpinson
quote:
Is already happening in Ms north of Vicksburg.
will happen all down the River. COE will be busy with levee repairs this season.
Bernoulli? In theory maybe but how fast is the water actually moving? not in the center, at the bankline.
Saturated unit weight of the levee material is the driver in classical slope stability problem, as discussed.
Also a sudden draw down may cause erosion at toe of levee due to excess seepage. Controlled draw down allows pressure to equalize slowly resulting in lower rate of seepage (no particulate transport).
This post was edited on 5/23/11 at 5:56 pm
Posted on 5/23/11 at 9:07 pm to catholictigerfan
Posted on 5/24/11 at 11:27 am to Tweener
Thanks for posting that, now who would like to comment on this? Notice how high the water was. ****if you can not tell from the photo how high the water was then please ask......
Unlike so many people, everything I have said is not opinion based, it is fact based. This photo is a nice demonstration of a FACT.
Unlike so many people, everything I have said is not opinion based, it is fact based. This photo is a nice demonstration of a FACT.
Posted on 5/24/11 at 11:29 am to shaunmccarron29
Hey shaun, how high was the water?
Posted on 5/24/11 at 1:02 pm to shaunmccarron29
quote:
Unlike so many people, everything I have said is not opinion based, it is fact based. This photo is a nice demonstration of a FACT.
Wow...
You can lead a horse to water (so to speak).
Posted on 5/24/11 at 1:38 pm to shaunmccarron29
quote:
Unlike so many people, everything I have said is not opinion based, it is fact based. This photo is a nice demonstration of a FACT.
Please explain the fact to the stupid people. It would be very enlightening.
Posted on 5/24/11 at 4:14 pm to shaunmccarron29
quote:
shaunmccarron29
Since you took the time to do a little homework in your other thread, I'll bite.
The picture above is a result of:
#5 Shear failure (slope instability) of the levee. Manifested as large slabs of the levee sides sliding down the side of the levee during or immediately after high-water. Many days of high water will saturate the surface layers of the levee (by phreatic water movement) making them heavier than the underlying layers. The heavier surface layers lose cohesion with the lower layers, resulting in the surface layer sliding down the slope of the levee. In older levees constructed of sand the entire levee can become saturated during a flood resulting in total collapse of the levee.
This has absolutely nothing to do with "the river washing away sediment" as querried in this thread title.
Lighten up Francis.
Posted on 5/25/11 at 9:55 am to shaunmccarron29
quote:
This photo is a nice demonstration of a FACT.
So this is how a plane flies?
Posted on 5/25/11 at 9:59 am to Tweener
while that looks bad, it don't think it was. it looks like while the levee did wash away it still did what it was designed to do keep flood waters out of the low lying areas on the other side of the levee. I hope the same thing would happen here.
Posted on 5/25/11 at 8:33 pm to catholictigerfan
I agree. It only failed because of a relatively rapid decrease in stage. So it did its job while the water was high.
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