Record tidal floods hit coastal communities last year


Tidal floods rose to record levels in the United States last year and are only expected to worsen with the new report National Oceanic and Atmospheric Administration (NOAA). Coastal communities experienced twice as many tidal floods last year as they did 20 years ago. The records were either compatible or broken in 14 locations on the southeast Atlantic and Gulf coasts.

Nationally, coastal communities suffered from the four-day median of last year’s high tide – although some sites suffered more than four times the number. NOAA’s outlook for the rest of the year until April 2022 will rise from three to seven days of flooding. But because sea ​​level rise The long-term forecast linked to climate change is more worrying: in 2030, there could be seven to 15 days of flooding. And in 2050, staggering 25-75-day tidal floods could emerge.

It can hurt roads, waste and rainwater systems, NOAA warned. As tidal floods increase a lot, cities and neighborhoods need to adapt.

“For the first time in human history, the infrastructure we are building needs to be designed and built with future conditions on the coast,” said Nicole LeBoeuf, director of NOAA’s National Ocean Service, in the press yesterday. “This information we provide will help communities plan the location of buildings and ensure the safety of people.”

Tidal floods, also known as “harmful” or “sunny days” floods, flood streets and homes with water levels rising up to two meters higher than the average high tide. While low tide and high tide are Caused by the moon, this adverse flood is due to other factors. As average global temperatures rise, the oceans expand and push seawater further ashore. The situation of coastal residents is deteriorating in places where the land is in recession or natural coastal barriers are depleting. Things are leveling off more awkward in the mid-2030s when a regular oscillation in the lunar orbit combines with rising sea levels causing higher tides, NASA found in a new analysis.

Property with a value of $ 1 trillion is prone to coastal flooding – and we’re not just talking about summer beach homes. By 2050, their number affordable housing those prone to flooding could triple as a result of climate change, according to a study published last year.

According to NOAA, costly floods, which in the past could have posed a threat only during a storm, may now be due solely to a change in prevailing winds or currents, or even a full moon. The agency monitors 97 tide meters across the United States and looked in May 2020 to April 2021 for its new report. Eighty percent of the places it collects data on the coasts of the Southeast Atlantic and Gulf rose on flood days. (Floods on the West Coast were spared because of last year’s La Nina.)

In some places, change has been very rapid. People living on the west side of the Gulf of Mexico had 17 flood days last year – an amazing 1,100 percent increase from the 2000 experience. East Bay residents had nine days of flooding, a 600 percent increase over the past two decades. There were eight flood days on the southeast Atlantic coast, an increase of 400% since 2000.

“We’re seeing dramatic change in just two decades, and conditions are changing except in a few places,” LeBoeuf said. This change is not limited to the United States. The shorelines around the globe are at risk of increasing and extreme flooding. For example, in the tropics, the frequency of severe floods could worsen 25 times by 2030, previous study has found.

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