Sinking land increases risk for thousands of coastal residents by 2050

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A new study provides a new comprehensive look at the potential for flooding in a combined 32 cities along the Atlantic, Pacific, and Gulf coasts.

It predicts as many as 500,000 people will be affected by flooding alongside 1 in 35 privately owned properties within the next three decades, and it highlights the racial and socioeconomic demographics of those potentially affected.

"The whole purpose of this paper is to provide data to support decisions," Shirzaei said."Every city, every county has a flood resiliency plan in place. They are required by law to create that. But it's likely nobody has received the entire picture until this study, which creates probably the first comprehensive picture of what's happen in the not-too-distant future."Chandrakanta Ojha of the India Institute of Science Education and Research in Punjab, IndiaRobert J.

This study revealed that 24 of the 32 coastal cities are currently sinking more than 2 millimeters per year and half of those cities have areas sinking more than global seas are rising. These numbers might seem small, but when combined with sea-level rise over time, it adds up to quite a significant shift, according to Ohenhen.

"When we looked at it across the board, we found that there is a general unappreciation for flood protection, particularly on the Atlantic coast," Ohenhen said."And even the levees there often protect less than 10 percent of the city, compared to other cities on the Pacific or Gulf coasts where up to 70 percent is protected."

"That was the most surprising part of the study," Ohenhen said."We found that there is racial and economic inequality in those areas in that there was an overrepresentation of historically marginalized groups potentially impacted as well as properties with significantly lower value than the rest of the cities. It really multiplies the potential impact to those areas and their abilities to recover from significant flooding.

 

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