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.
Reference: Chanson, H. (2011). “Tidal Bores, Aegir, Eagre, Mascaret, Pororoca: Theory and Observations.” World Scientific.