Giving Compass' Take:
- Virginia Tech and the US Geological Survey indicate that the decline of the ocean's edge is causing major cities to sink.
- How can this research help inform future critical infrastructure investments?
- Learn why solutions to climate change need to include oceans.
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Major cities on the US Atlantic coast are sinking, in some cases as much as 5 millimeters per year, a new study shows.
The research from Virginia Tech and the US Geological Survey confirms the decline at the ocean’s edge well outpaces global sea level rise.
Particularly hard hit population centers such as New York City and Long Island, Baltimore, Virginia Beach, and Norfolk are seeing areas of rapid “subsidence,” or sinking land, alongside more slowly sinking or relatively stable ground, increasing the risk to roadways, runways, building foundations, rail lines, and pipelines.
“Continuous unmitigated subsidence on the US East Coast should cause concern,” says lead author Leonard Ohenhen, a graduate student working with Manoochehr Shirzaei, associate proifessor at Virginia Tech’s Earth Observation and Innovation Lab. “This is particularly in areas with a high population and property density and a historical complacency toward infrastructure maintenance.”
Shirzaei and his research team pulled together a vast collection of data points measured by space-based radar satellites and used this highly accurate information to build digital terrain maps that show exactly where sinking landscapes present risks to the health of vital infrastructure.
Using the publicly available satellite imagery, Shirzaei and Ohenhen measured millions of occurrences of land subsidence spanning multiple years. They then created some of the world’s first high resolution depictions of the land subsidence.
These groundbreaking new maps show that a large area of the East Coast is sinking at least 2 mm per year, with several areas along the mid-Atlantic coast of up to 3,700 square kilometers, or more than 1,400 square miles, sinking more than 5 mm per year, more than the current 4 mm per year global rate of sea level rise.
“We measured subsidence rates of 2 mm per year affecting more than 2 million people and 800,000 properties on the East Coast,” Shirzaei says. “We know to some extent that the land is sinking. Through this study, we highlight that sinking of the land is not an intangible threat. It affects you and I and everyone, it may be gradual, but the impacts are real.”
In several cities along the East Coast, multiple critical infrastructures such as roads, railways, airports, and levees are affected by differing subsidence rates.
Read the full article about major cities are sinking by Lon Wagner at Futurity.