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Trevaylin
LSU Fan
south texas
Member since Feb 2019
1954 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?






1905 the corp of engineers closed off the miss river connection to bayou lafourche. 18-20 % of the river flow had annually flowed through bayou lafourche. Within 5 years salt water was present in the bayou as far up as Raceland. The lack of fresh water and silt was the major contributor to coastal erosion. the answer to your question is yes.

Another interesting observation, there is lots of water quality data at the monitoring station where the achafalia breaks off the Miss. Suspended solids were 40 percent reduced in the 50's , about the same time as the corp was working very hard to reduce soil erosion across the Miss. Vally watershed. Solids reduction continuous to this day and impacts on soil erosion .

Corp of engr. is responsible for much of the coastal erosion, not global warming or oil company.


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thegreatboudini
USA Fan
Member since Oct 2008
4809 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
Even more generally speaking coastal erosion and coastal land loss is primarily due to man forcing the river against its natural progression over time. Yes, levees are a big part of that.

These big rivers are dumping sediment off into the abyss right now and that’ll not change in our lifetime.


GREENHEAD22
LSU Fan
Member since Nov 2009
15596 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
You have a lot of faith in ORCS


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10
KemoSabe65
Member since Mar 2018
4271 posts
 Online 

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

You’ve got solid ground and beaches.

Mae's, Holly, Rutherford? Lots of marsh from our SW La beaches to solid ground.


jeffsdad
Member since Mar 2007
14181 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
1. Find silt that would have been deposited by the Mississippi River if left natural.
2. Dragline into dump trucks.
3. Deposit into 15 dump trucks twice per day.
4. Dump trucks take silt to wherever it naturally would have gone if the river had been left natural, or use to make dikes to stop sea water contamination.
5. Dump loads.
6. do this continuously for 20 years. If done properly, problem solved.


td1
Baton Rouge
Member since Oct 2015
1688 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

Dump trucks take silt to wherever it naturally would have gone if the river had been left natural,


You can’t drive a dump truck in da marsh brah.


biglego
LSU Fan
Ask your mom where I been
Member since Nov 2007
64564 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
Jeff’s dad has never been to the marsh lol


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20
Bjorn Cyborg
LSU Fan
Member since Sep 2016
16797 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
Absolutely.


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Boudreaux35
BR
Member since Sep 2007
18793 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

1. Find silt that would have been deposited by the Mississippi River if left natural.
2. Dragline into dump trucks.
3. Deposit into 15 dump trucks twice per day.
4. Dump trucks take silt to wherever it naturally would have gone if the river had been left natural,


You're not driving a dump truck full of silt to where it would have been deposited naturally anymore. Not without spending MILLIONS to build up and build a road to that particular spot.

I certainly hope you were being sarcastic.


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10
ForLSU56
LSU Fan
Rapides Parish
Member since Feb 2015
2451 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

It was built after the 1927 flood almost washed away everyone along the Mississippi. It’s done a great job of keeping cities dry. It was never built to save the coast.


Highly recommend reading this. It give a great perspective on this very topic...as well as some insight on the politics that came into play.

Rising Tide: The Great Mississippi Flood of 1927 and How it Changed America


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30
ForLSU56
LSU Fan
Rapides Parish
Member since Feb 2015
2451 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

It was built after the 1927 flood almost washed away everyone along the Mississippi. It’s done a great job of keeping cities dry. It was never built to save the coast.


Highly recommend reading this. It give a great perspective on this very topic...as well as some insight on the politics that came into play.

Rising Tide: The Great Mississippi Flood of 1927 and How it Changed America


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ForLSU56
LSU Fan
Rapides Parish
Member since Feb 2015
2451 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

It was built after the 1927 flood almost washed away everyone along the Mississippi. It’s done a great job of keeping cities dry. It was never built to save the coast.


Highly recommend reading this. It give a great perspective on this very topic...as well as some insight on the politics that came into play.

Rising Tide: The Great Mississippi Flood of 1927 and How it Changed America


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dirtytigers
New Orleans Pelicans Fan
225
Member since Dec 2014
1687 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
Im not sure what all is out in the marshland people wise. But why couldnt we create a Lock and canal system throughout South LA in uninhabited ares designed to divert Mississippi river water to places that are fighting mass erosion. Would cost a shite ton of money, but as a Civil Engineer I dont see why it wouldnt be possible


bayoudude
LSU Fan
Houma
Member since Dec 2007
21283 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
I would think that siphoning off enough flow to be helpful would reduce the load down River and the River below nola would silt in causing shipping issues. It’s one of those situations that to do it right would impact many people.


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hubertcumberdale
LSU Fan
Member since Nov 2009
2840 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
The Mississippi River created the land in the delta and since it has been restricted (levee'd and dam'd), there is significantly less sediment being deposited where was in the past



This post was edited on 5/4 at 10:17 am


MikeBRLA
LSU Fan
Baton Rouge
Member since Jun 2005
13549 posts
 Online 

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

she is my representative in state congress


Come again?


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SantaFe
LSU Fan
Baton Rouge
Member since Apr 2019
1433 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

3. Deposit into 15 dump trucks twice per day


That would be like pouring a cup of dirt into a swimming pool.


Trevaylin
LSU Fan
south texas
Member since Feb 2019
1954 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?



good visual


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SantaFe
LSU Fan
Baton Rouge
Member since Apr 2019
1433 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

But why couldnt we create a Lock and canal system throughout South LA in uninhabited ares designed to divert Mississippi river water to places that are fighting mass erosion


One of the main contention arguments is the number of canals cut into the marsh by oil companies and how that has accelerated the erosion of the marsh. Much of the marshland is in private ownership. In order to flood the marsh with sediment from the Miss. R. these factors must be taken into account. Some land owners may not want their land flooded, others may. Also the river does not have the same sediment load that it had 150 years ago. St.Bernard, Plaquemines, Jefferson, Lafourche, Terrebonne ,and St. Mary parishes have this problem to deal with. Christmas trees and rock jetties are only a small stop gap solution to this problem. Allowing back water flooding from the Atchafalya spillway may be a partial solution.


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Cowboyfan89
McNeese State Fan
Member since Sep 2015
9525 posts

re: Question for you civil engineers. Does the levee system make coastal erosion worse?
quote:

Mae's, Holly, Rutherford? Lots of marsh from our SW La beaches to solid ground.

Solid ground might not have been the best way to describe it, but geologically speaking, SWLA is a much older and more stable landscape than SELA. The main threat in SWLA is saltwater intrusion due to the manipulation of the Calcasieu River/Ship Channel. Subsidence isn't a major player in the coastal landscape of SWLA like it is in SELA.


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