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re: NOLA is sinking - NASA maps show the rate
Posted on 5/16/16 at 8:08 pm to lsugradman
Posted on 5/16/16 at 8:08 pm to lsugradman
quote:
Did some of the first geodetic measurements there and the level of subsidence was shocking.
So there is nothing new in these reports other than some pretty graphics, right? Surveyors have known about the geosyncline and subsidence effects coupled with sea rise for a good while now. Regardless of the cause, future levees will have to be higher.
1
Posted on 5/16/16 at 8:08 pm to Uncle Stu
quote:
my issue is the ulterior political motivations to promote the man-made climate change stance to the sound of alarmists' doom and gloom
This get's blown out of proportion because it has become a political issue. It's nauseating that every time an article mentions global warming or climate change that people on TD feel the need to mock it with no substance to back it up.
You could have just posted the synopsis and let it stand on its own.
quote:
regardless, it's a political issue, if you don't think it is, you're sorely mistaken.
After working in consulting prior to returning to academia, I can tell you full well that industry is trying to bend things in their favor. As much as they push green publicity campaigns it is nothing more than to save face.
Industry sees pollution controls as costing them dollar signs, and it is in their best interest to spread misinformation and stir the pot.
I'm fine with arguments that current climate trends are nothing more than cyclical. It's just that people rarely can back up their opinions that were formed by their favorite commentator and not actually taking the time to study the science.
This post was edited on 5/16/16 at 8:12 pm
Posted on 5/16/16 at 8:13 pm to Bmath
quote:
I can tell you full well that industry is trying to bend things in their favor.
which industry? Politics, consulting or academia?
quote:
As much as they push green publicity campaigns it is nothing more than to save face.
who?
Posted on 5/16/16 at 8:14 pm to lsugradman
quote:
quote:
Michoud
Did some of the first geodetic measurements there and the level of subsidence was shocking.
Is its subsidence not also caused by local faulting?
Posted on 5/16/16 at 8:19 pm to OMLandshark
quote:
The idiots around here would still deny global warming as they drowned.
Posted on 5/16/16 at 8:26 pm to Uncle Stu
This article is pure BS. My backyard hasn't sunk at all because it doesn't look any different today than it did 100 years ago. And don't even get me started on their faulty NORCO and Harahan pictures which don't show shite!
The Lost Cities of NORCO, Harahan, and New Orleans will still be here at least until I die.
The Lost Cities of NORCO, Harahan, and New Orleans will still be here at least until I die.
This post was edited on 5/16/16 at 8:28 pm
Posted on 5/16/16 at 8:40 pm to Uncle Stu
quote:
regardless, it's a political issue, if you dont think it is, you're sorely mistaken.
So what is the party affiliation of carbon dioxide?
I'm pretty sure methane consistently votes conservative republican.
Posted on 5/16/16 at 8:41 pm to Sid in Lakeshore
quote:
So there is nothing new in these reports other than some pretty graphics, right? Surveyors have known about the geosyncline and subsidence effects coupled with sea rise for a good while now. Regardless of the cause, future levees will have to be higher.
Nothing really that different than we were seeing 10-15 years ago. Just some pretty graphics using differences in LIDAR digital elevation models. We were looking at that data as well as going out into the field with high precision leveling tools and GPS stations.
Posted on 5/16/16 at 8:47 pm to man in the stadium
quote:
Is its subsidence not also caused by local faulting?
The entire coastal Louisiana area is subsiding just because its just a collection of MR delta lobes formed over thousands of years. That's what deltas do, the form and then sink and then the river avulses and builds up another area. The levees obviously stopped the ability for the river to replenish its delta system so those old areas sink. Also the weight of the delta depresses the earth in the area, known as crustal flexure.
There are also areas of locally high subsidence usually associated with increased slip rates along fault lines. This fault slip can be accelerated by local excessive groundwater or O&G withdrawal. This effect is seen all across the gulf coast and probably is whats accentuating the subsidence in the Michoud area.
Posted on 5/16/16 at 8:50 pm to ihometiger
quote:
This article is pure BS. My backyard hasn't sunk at all because it doesn't look any different today than it did 100 years ago
Pretty solid logic imo
Posted on 5/16/16 at 8:52 pm to Uncle Stu
New Orleans is too important to this state's economy to lose. Something needs to be done, even if it includes letting the river flood areas around New Orleans so the sediment isn't deposited at the base of plaquemines parish where it just falls to the deep ocean floor
Posted on 5/16/16 at 9:03 pm to lsugradman
quote:
The entire coastal Louisiana area is subsiding just because its just a collection of MR delta lobes formed over thousands of years. That's what deltas do, the form and then sink and then the river avulses and builds up another area. The levees obviously stopped the ability for the river to replenish its delta system so those old areas sink. Also the weight of the delta depresses the earth in the area, known as crustal flexure.
a lifetime and a half ago, I had a teacher in middle school who's big campaign was the effects of the army corps of engineers' dredging of the MR and the ship channels. Which, according to her, increased the flow, disallowed the silt and sediment from upriver to settle and replenish the delta, and instead flow directly out into the gulf. It seemed like good science, but this was 30 yrs ago, and I was a kid
is this accurate? Is dredging the main culprit to coastal erosion?
Posted on 5/16/16 at 9:08 pm to Uncle Stu
The Atchafalaya delta is the only part of coastal La building land area.
Posted on 5/16/16 at 9:23 pm to schwartzy
quote:
New Orleans is too important to this state's economy to lose. Something needs to be done, even if it includes letting the river flood areas around New Orleans so the sediment isn't deposited at the base of plaquemines parish where it just falls to the deep ocean floor
Nola isn't just a big deal to the state. The Port of New Orleans is a major player for the entire U.S. here. The city is almost 300 years old. We'll be fine.
Posted on 5/16/16 at 9:24 pm to Uncle Stu
So there's hope NOLA will be a nice place some day??
Posted on 5/16/16 at 9:53 pm to Uncle Stu
Gotta be the statues. Once those are removed all will be well.
Posted on 5/16/16 at 10:01 pm to Uncle Stu
quote:
Is dredging the main culprit to coastal erosion?
yes and no.
There is a finite sediment budget in the MR for marsh nourishment/land formation.
Several causes deminish the availability and effect of the finite resource.
Upstream damns - cause loss of available sediments due to silting in upstream of damns
levees - contain flood waters and sediment, preventing it from reaching the marsh
dredging - could in parts increase cross-sectional area thereby REDUCING flow rate and increasing sedimentation IN THE RIVER and reducing it in the MARSH. Recently dredged sediments have been increasingly pumped to the marsh (beneficial use). This is more costly and previously the dredged material was stacked in predetermined areas of least (present day) cost not most environmental benefit. Of course we didn't really understand ALL the true costs.
Basically, "It's complicated".
This post was edited on 5/16/16 at 10:04 pm
Posted on 5/16/16 at 10:06 pm to lsugradman
Oh.... Stop this horseshite! Bmath says it is because of climate change. Bmath is in academia and he be real smart.
Posted on 5/16/16 at 10:07 pm to Dick Leverage
quote:
because of climate change
Well, climate change MAY be contributing to sea level rise and therefore PART of the equation for south La.
ETA: I have read that the prediction centers think the climate change may force more hurricanes up the East coast and away from the Gulf coast. So there is that....
This post was edited on 5/16/16 at 10:10 pm
Posted on 5/17/16 at 1:18 am to Sid in Lakeshore
Eustatic (global) vs isostatic (local) sea level change. Global warming may be causing eustatic sea level rise but in coastal Louisiana that is far outpaced by isostatic relative sea level rise due to subsidence.
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