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Extreme Weather

Changing climate and rising sea level leading to more high-tide floods on US coast

Dan SymondsBy Dan SymondsJuly 15, 20223 Mins Read
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Climate change and sea level rise are leading to more high-tide floods at US coastal cities, according to a study from the University of Central Florida.

Multiple processes contribute to high-tide flooding, also referred to as ‘nuisance flooding’ or ‘sunny-day flooding,’ depending on tides and local wind and pressure conditions, as well as larger-scale phenomena such as El Niño/La Niña. But according to the study, little is known about how these factors work in concert to cause regional high-tide flooding.

The analysis also revealed that as sea level has risen, the number of co-occurring factors needed to cause a high-tide flood has dropped from three or four, to one or two. Essentially, in many coastal cities, fewer things need to go wrong for a high-tide flood to hit.

Thomas Wahl, a coastal engineer at the University of Central Florida and co-author of the study, said, “When I started my career 15 years ago, I don’t think we had a name for what now we know as high-tide flooding. It is an emerging issue and one of the immediate consequences of rising sea levels.”

The new study looks beyond tides to see what drives these floods, which are now twice as likely to occur in the USA than they were in 2000. Wahl and his colleagues analyzed hourly tide data from gauges at 120 locations around the country, spanning more than 20 years, to see which processes were affecting sea level at different places. They also explored seasonal differences in high-tide floods and which processes compounded to create more severe flood events. The researchers found clear regional differences in what causes high-tide floods around the country.

“Along the West Coast, where sea level has risen less since the 1950s compared to other parts of the country, tides play an important role in generating high-tide flood events,” said Wahl. “Along the Gulf Coast, the seasonal variations in sea level are relatively more important compared to the other regions.”

Further up the East Coast, wind and atmospheric pressure were often one of the ingredients to cause high-tide floods. Identifying these differences is essential to accurately predicting how flood regimes will change in coastal cities.

Wahl was not surprised by these results but notes how important it is to quantify what has long been expected. The database he and his co-authors have built can help improve existing tools that show city planners how many floods they can expect in the future under different sea level rise scenarios and make decisions on where and when to adapt.

To read the full study published in AGU’s Journal of Geophysical Research-Oceans, click here.

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