Laut Studie sinken Dutzende Gebäude in Florida | InSAR-Beobachtungen baubedingter Küstensenkungen auf den Barrier Islands in Miami, Florida

Relevant passages from the news report:

>The study, led by scientists at the University of Miami, found 35 buildings from Golden Beach to Miami Beach sank as much as three inches between 2016 and 2023. The sinking buildings — which together accommodate tens of thousands of residents and tourists — include the Ritz-Carlton Residences, Trump Tower III, Trump International Beach Resorts and the iconic Surf Club Towers.
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>Researchers said the main cause behind the sinking was vibrations from construction, which can cause soil particles to compact and settle, resulting in subsidence – the gradual sinking of land.
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>The effect is like shaking ground coffee around to create more room, Falk Amelung, senior author of the study and a professor of geophysics at the University of Miami’s Rosenstiel School Department of Marine Geosciences, told CNN. But that wasn’t the startling conclusion.
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>“It’s not a surprise if buildings move during the construction or immediately after the construction, because it’s heavy and the engineers take that into account when they build,” Amelung said, but that it continues for years after, “that was surprising.”
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>…
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>Nearly 70% of buildings are sinking in northern and central Sunny Isles Beach, according to the study. Around 23% of the structures in these locations were built in the past decade.
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>In addition to construction vibrations, daily tides that move water toward and away from the shore can also cause the ground to shift and the buildings above it to sink.
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>Seismic activity or soil compaction, either naturally from the weight of sediment accumulating over time or from heavy buildings pressing down on the ground, can also cause sinking – a problem in areas where new coastal land has been created over the years by backfilling with sediment.
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>…
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>At these specific locations, McNoldy told CNN “the buildings are sinking as fast as the ocean is rising, effectively doubling the (sea level rise) rate at those sites.”
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>But Shirzaei and Amelung said there is no reason to panic, noting that the satellite method researchers used can now proactively monitor the stability of coastal high-rises.

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Journal link: [InSAR Observations of Construction-Induced Coastal Subsidence on Miami’s Barrier Islands, Florida](https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024EA003852)

Abstract:

>This study utilizes Interferometric Synthetic Aperture Radar (InSAR) to examine subsidence along the coastal strip of the Miami barrier islands from 2016 to 2023. Using Sentinel-1 data, we document vertical displacements ranging from 2 to 8 cm, affecting a total of 35 coastal buildings and their vicinity. About half of the subsiding structures are younger than 2014 and at the majority of them subsidence decays with time. This correlation suggests that the subsidence is related to construction activities. In northern and central Sunny Isles Beach, where 23% of coastal structures were built during the last decade, nearly 70% are experiencing subsidence. The majority of the older subsiding structures show sudden onset or sudden acceleration of subsidence, suggesting that this is due to construction activities in their vicinity; we have identified subsidence at distance of 200 m, possibly up to 320 m, from construction sites. We attribute the observed subsidence to load-induced, prolonged creep deformation of the sandy layers within the limestone, which is accelerated, if not instigated, by construction activities. Distant subsidence from a construction site could indicate extended sandy deposits. Anthropogenic and natural groundwater movements could also be driving the creep deformation. This study demonstrates that high-rise construction on karstic barrier islands can induce creep deformation in sandy layer within the limestone succession persisting for a decade or longer. It showcases the potential of InSAR technology for monitoring both building settlement and structural stability.

> The study, led by scientists at the University of Miami, found 35 buildings from Golden Beach to Miami Beach sank as much as three inches between 2016 and 2023.

Not a good match with sea levels rising.

Building skyscrapers on sandbars? What could possibly go wrong?

After 20 Jan: no they aren’t.