Ground subsidence along coastlines does not proceed at a steady rate, according to a research team that includes University of Central Florida associate professor Thomas Wahl. The discovery challenges a century-old assumption that vertical land motion—the land's sinking or rising—occurs consistently over time, with major implications for local sea level rise.
When the ground sinks, the ocean effectively rises relative to that land, amplifying the impacts of global sea level rise. The finding means that many coastal communities may face a faster rate of local sea level rise than current projections account for, since those forecasts typically assume a constant subsidence rate.
Researchers identified phases of variable change in ground subsidence, though the published report does not specify particular acceleration rates or provide specific measurements. The study underscores that the dynamic nature of land movement has been underappreciated in sea level planning.
Flood risks in vulnerable areas may be underestimated, potentially affecting infrastructure planning, insurance rates, and adaptation strategies. The findings suggest local sea level projections should be updated to reflect non-steady subsidence patterns.
The research team has not yet released specific regional breakdowns of where accelerated sinking is most pronounced, limiting immediate application for local planners.