Climate change creates many risks that are difficult to predict. Several events such as heatwaves, droughts and extreme storms are more likely to occur, but all of these events are highly dependent on year-to-year variability in weather. So while the odds may go up, it’s impossible to know when any of these events will hit a particular location.
Sea level rise, by contrast, looks much simpler. There is still uncertainty about how quickly sea levels will rise, but other aspects seem fairly predictable. you can see. And such analyzes have been conducted in different regions.
But owning a property on the water won’t do you much good if there’s flooding nearby and you can’t get to or have access to a hospital or grocery store when you need electricity or other services. . It is quite possible that sea-level rise will make the land high and dry, as it will cut off connectivity to essential services. A group of researchers analyzes the risk of isolation caused by rising sea levels and shows that it is a major factor in the future risks facing the United States.
Off-site risk
Conceptually, the separation is very easy to understand. Some people on the coast may live in relatively highlands, but access to their homes may involve roads through lowlands. but it can mean that you start losing access to roads due to high tide flooding long before the sea appears on your property. Access to schools, emergency services, etc. usually cannot be planned around the tide.
Flooding weakens road foundations, and breakdowns and maintenance can render roads unusable. Finally, critical infrastructure (water, sewage, electricity, networks) is often laid along roads. So loss of access to roads, even from regular flooding, can leave you incapable of living somewhere.
To find out just how important this kind of isolation is, a team of researchers (Tom Logan and Mitchell Anderson from the University of Canterbury, New Zealand, and Alison Riley from the University of Maryland) used OpenStreetMap to map all 48 of the United States. followed the streets of We compared it with the sea level rise projections made by the National Oceanic and Atmospheric Administration. Using his three scenarios of future sea levels (0.5, 1.0 and 2.0 meters rise by the end of the century), track all neighborhood access to the nearest critical facilities such as public schools and fire stations, and intervene. determined when the road to It is flooded during high tide.
This isn’t exact, but it gives a reasonable indication of when transportation to and from the neighborhood becomes impractical. This does not mean that the sea will completely block roads, but it does mean that flooding will be a regular problem.
The bad news is that there is no good news
The results make it clear that isolation will become a significant problem for the United States. Even under the lowest sea-level rise scenario (0.5 meters by 2100), in 2080 he would have more than half a million people at risk of isolation. In the intermediate scenario, that number increases to nearly 1 million of her.
There were several ways to view added risks. For example, in some areas, isolation occurs at sea level 2 meters below the level required to submerge the area. The risk of isolation also accelerates relative to flooding. Some areas not flooded until 2060 will become isolated as early as 2030 under a scenario of rapid sea level rise. The researcher also estimates that, even under a rising sea level scenario, 4 million inhabitants would be at risk of isolation in areas that remain above water.
These risks are also unevenly spread. For example, the risk of isolation is higher in Maine than in Florida, but Florida’s larger population means more people are at risk.
But regardless of the details, it’s clear that rising sea levels are making them far more dangerous than individual properties, and that many places will become far more difficult to live in long before the water starts to wash at your door. The study revealed. On the positive side, there are signs that some states are focusing on protecting critical infrastructure. But it’s unclear whether such foresight has become part of the considerations of homeowners and property developers.
If you’re interested in comparing the risk of isolation with the risk of flooding, researchers have created a website where you can explore the risks under different sea-level rise scenarios.
Nature Climate Change, 2023. DOI: 10.1038/s41558-023-01642-3 (About DOI).
