Transient tidal eddy motion in the western Gulf of Maine, part 1: Primary structure

► High frequency radar measurements reveal transient tidal eddy motions. ► Numerical circulation model simulate near-coast eddy motion formation. ► Observations show that model over-predicts currents due to weak bottom friction. ► Phasing of sea level tilts and friction generate phase eddy motion. ► Eddies signal the change of tidal flow.