If you blink, you’ll miss them: dozens of tiny temperature sensors are set up underground in the Millennium Park train station. They are measuring the phenomenon of underground climate change.
If you blink, you’ll miss them: dozens of tiny temperature sensors set up underground in the Millennium Park train station.Alessandro Rotta Loria, a civil engineering professor at Northwestern University, checks the latest reading on his cellphone: 25 degrees C. The censors record the subsurface temperature every 10 minutes. Rotta Loria analyzes tens of thousands of readings every day.
It’s felt most acutely in so-called subsurface heat islands — like the Millennium Park train station. Rotta Loria said that heat causes the soil and construction materials to deform. That’s making the ground beneath the Loop sink by a few millimeters every year.“It doesn’t impact the safety or threaten collapse of buildings,” Rotta Loria said. “But these deformations could have performance impact on structures — problems related to excessive settlement, tilting and potentially cracking.”
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