Sea Rise Could Force Millions In Florida To Adapt Or Flee (miamiherald.com)

mdsolar writes: For the first time, a team of researchers looked at ongoing population growth in areas where the National Oceanic and Atmospheric Administration has created flood maps that more accurately reflect local conditions. What they found was startling: projections that failed to factor in population growth in dense states like Florida hugely underestimated the number of people at risk and the cost of protecting them. Combined with the findings from a 2015 report, that means Florida can claim two titles: most property at risk, and now, most people.

Comments

Let's all start running now!

[cjonslashdot]

Yes but at a sea level rise rate of 2-4mm/year, I think that people will have time to adjust!!

Re:Let's all start running now!

[Anonymous Coward]

May I suggest you start talking to the Dutch. Their language sounds like a mix of German, English and a throat infection, but I assure you, they all understand and speak English excellently. The name "Netherlands" means "lower countries". You know that the Netherlands are famous for windmills, right? Well, those aren't all mills. Many are wind pumps, which were used to drain the land, most of which is below sea level.

Re:Let's all start running now!

[jiriw]

We do get a couple of violent storms each year (in the 10 beaufort region), Hurricanes (12 beaufort), probably not... For the Netherlands such violent storms are more like a once in couple of decades event. In the '90's there was a severe storm travelling through North-West Europe with an hourly average wind force of 11 beaufort in the Netherlands and dozens of fatalities in at least 5 different countries.

Although our storms may not be as violent as the hurricanes of the American South-east, there is a trough-shape in the North Sea due to the British isles at our West, which ads extra height to the local sea-level when wind is blowing from the North. That effect is one you won't have at the Florida coast. Sea water can be diverted in enough directions there, but force of the waves may be larger with more violent storms... so you maybe need tougher (thick-skinned, so to speak... more use of rocks to break the waves instead of sand dunes and earthen dikes?) dikes instead of higher ones. However, I think the hurricanes you have should not be a hindrance to implement proper water works in your country if you really want to defend the coastal lands from future flooding. There, however, is a totally different price to pay. A dyke between beach property and the proper beach makes the property a lot less ... beachy.

In combination with spring-tide, the elevated sea level due to the trough shape of the North Sea, caused the 1953 sea-side flood which flooded major parts of the Netherlands and killed over 1800 people in the Netherlands alone. The sea level rose 4,5 meters (15 feet) above normal. That last major flood in Dutch history was the reason we implemented our major water works, the Delta works, which have kept us safe since then. The 2006 'flood', which caused a rise in sea level of 4,8 meter (16 feet) didn't cause any flooding in the Netherlands. And all water works functioned within proper specifications.

A once in a couple of decades event, like the 2006, 1990 and 1953 storms is something which is fully calculate into the structural specifications of our water works. The Delta works, reduced the risk from large-scale sea-side flooding from once in 80 years to once in 4 millennia. We also recently (a decade ago) strengthened the river dykes to prevent flooding by higher river water levels. Global warming means more water ice from glaciers is melting and more evaporation above land and sea -> more rain inland, adding to the usual run-off, causing higher peak-water levels. This caused some inconviniences in the '00's... Previous predictions were too conservative and we acted accordingly. The largest river of North-West Europe, the Rhine flows right through our country... If a storm crosses Germany, we see the result in rising water levels a couple of days later. But also the Meuse, which also flows through the Netherlands and which is a rain-fed river, mostly, can put up quite an act.

And temperatures have been rising, storms are become more violent on average. In 2013 we had a weather pattern which could, for the first time in history, be described as a super-cell, with two accompanying tornadoes.

Re:Let's all start running now!

[kilfarsnar]

The geology of south Florida is completely different than the Dutch land. Look it up. You are suggesting we build dikes around the entire Florida coastline and have giant pumps just continually pump out the seawater? It won't happen. One, people won't allow their perfect beach view hidden behind a giant dike and the porosity of the ground it just way too high and the coastline is way too long.

I say we just build the wall and get the ocean to pay for it!

Re:Let's all start running now!

[Sique]

Maybe I suggest you start talking to the Dutch either. I often hear that argument, but it means that you just use it as a talking point, but have never bothered to actually look at what the Dutch have there. First of all, the Dutch live at a coast that is very unique in that it has a large intertidal zone, a landscape so unique that there is no english word for it (while French, Dutch, German and Danish call it vasière, wad, Watt and vade resp.) It can stretch over several miles and falls dry every low tide and gets flooded every high tide. In this zone, waves wash new sand on the shore every high tide, so the land slowly grows into the sea. (It's different in Northern Germany and Danmark, where the tidal streams wash the sand away.) Thus, along the dutch shore new islands form all the time and grow.

In historical times already, the Dutch started building dams that got flooded every high tide, but kept the sand in the low tide, thus increasing the land grow at their coast. If the spot was high enough, they started building a dike on it to prevent even very high tides to get onto the freshly won land. After the dikes are ready and all remaining water has been pumped out, the land is called a polder. Most of the land at the Dutch coast is polderland. What we have here is a tradition of 1500 years of winning land by creating polders on former seabeds, helped by the unique feature of the large intertidal zones.

One problem still remains: Rivers flow into the sea, and if the land level is below sea level, they will not. At every river mouth, you have to somehow get the river water into the sea water, and if the sea level rises, you have to have pumps that are able to pump all the river water up into the seawater, or the river mouth will move up until it reaches the point where the sealevel matches the river level. At the Dutch coast, this problem is migitated by another natural phenomenom: A very high difference between high and low tide. While for most of the oceans, the difference (called tidal range) is just one or two feet (and thus much lower than the expected rise in sea levels), at the Dutch coast, the difference is between 6 and 10 feet. Thus, to let the river into the sea, but not the sea water into the land, you just close big gates at the river mouths every high tide, but open it at the low tide.

Florida borders directly at the Atlantic Ocean, and thus the tidal range is very low, which means that no Floridan river will flow into the ocean anymore if the sea level rises. If you build large dikes around Florida, it will not be flooded by ocean water, but the rain water and the ground water, which no longer can flow into the ocean, will flood Florida instead.

Re:It'll sort itself out.

[Ol Olsoc]

You had better not let the environmentalist religious wackjobs hear you saying that humans can just adapt. They'll burn you at the stake if you're not running around screaming "THE END IS NIGH!!"

Who are these people? The environmentalists I know aren't religious, and are more oriented towards mitigating the issue.

And the religious I know don't believe in global warming, sea level rise, or any of that "liberal claptrap" at all, and are actively seeking the end of the world.

And as I've had to explain to many people, adapting doesn't men that you and your family change. It means you and your family and 99 percent of everyone dies, and the rest are left to reproduce.