of warming water is only part of what threatens coastal areas. The land is also sinking. This geologic two-step is happening rapidly enough to threaten infrastructure, farmland, and wetlands that tens of millions of people along the coast rely upon, according to asensors to map the vertical and horizontal motion of coastal land from New England to Florida.
“The good news is that subsidence is a problem that we can slow at local scales to some degree,” said Manoochehr Shirzaei, a co-author on both studies and director of the EOI Lab. Some important human-caused drivers that contribute to subsidence include groundwater extraction, the construction of dams and other infrastructure that block the natural flow of sediment that replenishes river deltas, and the drying and compaction of peat soils.—across much of the East Coast.
While the edge of the Laurentide ice sheet never got close to northern Florida, that region has relatively high rates ofThese natural isostatic adjustments take place relatively deep underground, occur over long periods of time, affect broad areas, and are responsible for about half of the vertical land motion that satellites observed along the East Coast, Shirzaei said.
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