A tidal bore is a strong surge of water that travels upstream against the current in a river or estuary during a rising tide. Tidal bores are significant in hydrology for understanding the dynamics of tidal waves, riverine processes, and the impact of tides on estuarine ecosystems.
Source Chanson, H. (2011). “Tidal Bores, Aegir, Eagre, Mascaret, Pororoca: Theory and Observations.” World Scientific.