The researchers found 35 high ascents along the shores of the Barrera Next to the construction is normal, researchers say that the subsidence continued for years and has not shown any stalling sign, although there are signs that construction activity could be a factor that contributes to the structures that They are being built and in existing buildings located nearby.
Researchers at the University of Miami, the University of Houston and other institutions published their findings in December in Earth and Space Science. They looked at 87 high structures in Sunny Isles Beach, Bal Harbor and Surfside, FLA. Further south to Miami beach, they found only one subsidence less than two of the 110 high coastal highs.
The average heights of the studied buildings range from 50 m of surfside to 195 ma the sunny islands of the south. According to the document, buildings that were reduced by 2 to 8 cm. In some cases, the subsidence rate remained the same, while in others it slows over time.
“The discovery of the extension of the points of interest of the subsidence on the southern coast of Florida was unexpected,” said Farzaneh Aziz Zanjani, the lead author of the study, in a statement. “The study emphasizes the need for continuous monitoring and a deeper understanding of long -term implications for these structures.”
Due to the subsidence in those recent buildings and other buildings between 200-300 m, researchers believe that construction vibrations can play a role. The area sits on porous limestone with layers of sand intertwined inside and researchers suggest that the vibrations of the work can cause the sand layers denser and the loose could continue under the loaded load due to fluidization. They added that pumping to eliminate the groundwater level for founding work could have similar effects and were also proposed if the tidal flows could play a piece of paper.
The team analysis included Champlain Towers South in Surfside, the condominium building that collapsed in 2021, killing 98 people. The researchers say they did not detect any displacement before the collapse, even during the near construction, indicating that the settlement was not the cause, although they point out that their measuring points were not for the section of The building where the collapse began.
To measure subsidence, researchers used the interferometric synthetic (insar) synthetic radar of the Sentinel-1 European satellites. Teledetection equipment can detect changes of a few millimeters to the surface of the Earth, comparing differences in radar signals over time. Other researchers validated the findings through data from the German satellite Terrasarar.
Antonio Nanni, a professor of Civil and Architectural Engineering at the University of Miami, said in a statement that residents and officials should be informed about any subsidence of their buildings.
“The establishment of a public database, similar to that of Europe, would allow residents, housing associations and authorities to control their buildings for signs of subsidence, inspect the cracks and take proactive measures,” he said Nanni.
