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Re: New Orleans Levees[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: New Orleans Levees
- From: Drew Morris <dmorris(--nospam--at)bbfm.com>
- Date: Fri, 20 Nov 2009 13:11:41 -0900
it's a combination of factors. The
area around new Orleans and the gulf coast around the Mississippi delta
is generally subsiding due to sediment compaction. The weight of
sediments "squeezes" out the water and affects the grain orientation in
soft sediments so the porosity decreases and the general section
decreases in thickness. Also, there is a component due to the sediments
loading the upper lithosphere and depressing the crust (isostasy).|
The sediments are probably not building upward. The affects of levees and the dredging of the Mississippi for shipping has allowed a lot of the sediment in the river to bypass the delta and get deposited further outbound in deeper water. This sediment starvation has allowed the barrier islands to diminish if not disappear.
Here's a starter:
Glenn Otto wrote:
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