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DrTskoul

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Re: Floods
« Reply #250 on: October 31, 2018, 12:17:02 AM »
you would have to dam the other entrance too... In any case..trade and shipping much more valuable... Most cities will have to deal with it... There are many ancient cities under the water already. Venice will just be another....
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be cause

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Re: Floods
« Reply #251 on: October 31, 2018, 12:40:57 AM »
the pretty flood in Venice reached 5feet in St Marks square .. 4th worst flood the city has experienced . As the flood was caused by wind forcing water up the Adriatic , a dam at the mouth of the Med would not have stopped it ..
 Looks like rapid melting of recent snow in the Alps over the coming days will cause further flooding in Europe as warmth follows the weather moving North .. b.c.
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oren

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Re: Floods
« Reply #252 on: October 31, 2018, 01:33:44 AM »
Quote
Another point - damming Gibraltar will raise global sea level faster.
Just fact-checking myself, Mediterranean surface area is less than 1% of the global ocean surface, so the effect on SLR elsewhere will be (almost) negligible.

RikW

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Re: Floods
« Reply #253 on: October 31, 2018, 01:28:25 PM »
you would have to dam the other entrance too... In any case..trade and shipping much more valuable... Most cities will have to deal with it... There are many ancient cities under the water already. Venice will just be another....

That's not that difficult, that's only a manmade channel. It would be an interesting project with huge  hydropower options. Although I don't know if the strait of gibraltar currently functions as a way to raise or to lower the mediterranean sea lvl.

magnamentis

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Re: Floods
« Reply #254 on: October 31, 2018, 07:50:27 PM »
Terrible idea. Once the dam is in place you will have hundreds of millions of people at risk of death in case of a catastrophic failure, dependent on continued maintenance forever after, even in case of major war, civilizational collapse, need for expensive refurbishment and whatever not, not to mention vulnerable to major terrorism or bombing.
It will be the Mosul Dam a hundred times over.
The good news being that by the time humanity realizes the imminent total loss of all coastal cities and infrastructure, there will not be enough cooperation and resources left to attempt such a project. (The same applies to geoengineering).
Another point - damming Gibraltar will raise global sea level faster. Will America, China, India, Northern Europe sit idle? No way.

while the risks you mention are true that would be the case for every dam, some more and some less depending what lays below them, hence that can't be an arguement, still millions or even billions of people live in places that would be erradicated in case of a dam failure. yangtse, river below the dam, cities below the hoover dam etc. etc. , probably thousands of such dams exist.

however, while opinions may differ and i'm not convinced that the idea is good, just considering, it's certainly not a "horrible idea" before all factors are weighed agains each other. the part about resources etc. is jumping to conclusions while it could be exactly the other way around. i say "could be" not "is" because under common threads history has also shown that even enemies can unite to first fight the common enemy and then fight each other again ;)

either way i don't conclude anything but the thought is certainly worth a proper and detailed analysis before being discarded in case of a sea-level rise of several meters.

last but not least in case of a 60+ meters rise the idea will become obsolete again, that and the time frame would also have to be part of a propers analysis.

the question will be what cost more, to rebuild all the cities far enough inland, how much time it takes to move population and cities compared to how much time a dam would win us to move slowly and organized etc. etc.

there are so many factors that one cannot just say "great" or "bullshit" to be honest i was surprised about the the "horrible" word while i respect a more negative approach to the idea. i tend to be open to ideas until they are proven to be no good and in this case we wouldn't do it for fun but for a an organized and much slower transition of the mediterranean population and infrastructure.
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Sigmetnow

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Re: Floods
« Reply #255 on: December 12, 2018, 04:13:59 PM »
Flooding from Hurricane Harvey in Houston, Texas last year.

Houston_First won’t recover from the economic hit until well into the next decade.

Houston First Tightens Belt To Pay Off Harvey Damage
https://www.houstonpublicmedia.org/articles/news/2018/12/11/315061/houston-first-tightens-belt-to-pay-off-harvey-damage/

Cross-posted from Hurricane 2018 thread
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kassy

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Re: Floods
« Reply #256 on: December 12, 2018, 05:05:41 PM »
Quote
Another point - damming Gibraltar will raise global sea level faster.
Just fact-checking myself, Mediterranean surface area is less than 1% of the global ocean surface, so the effect on SLR elsewhere will be (almost) negligible.

The Mediterranean Sea is quite salty because it has a lot of evaporation.

It would be a more advanced version of the Oosterscheldedam. Probably should have sluices for shipping and points to let in Atlantic water.

The big problem is when is it urgent enough to build and at that time which projected SLR do you use for planning? And if that is really bad we might need some money in the north for flood defence too...or relocating.




sidd

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Re: Floods
« Reply #257 on: December 21, 2018, 07:47:58 PM »
Amtrak treading water:

" Parts of Amtrak’s Northeast Corridor route, which carries 12 million people each year between Boston and Washington, face “continual inundation.”  "

"Amtrak has since de-emphasized the threat of climate change in its public documents, even scrubbing the phrase entirely from its most recent five-year strategic plan."

"One of the redacted portions of the report is an analysis of the full costs and benefits of protecting the corridor against climate change, making it impossible to know if the company has determined it would save more money by keeping the corridor open than it would have to spend to save it. The disclosure of that information “could possibly cause public confusion,” ... "

https://www.bloomberg.com/graphics/2018-amtrak-sea-level/

They be screwed.

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Re: Floods
« Reply #258 on: December 21, 2018, 07:50:28 PM »
What a pity  :) "Shrug", Karma rules  :)

Sigmetnow

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Re: Floods
« Reply #259 on: December 23, 2018, 02:29:43 PM »
So, tunnels, then?
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