Author(s): Hubert Chanson
Linked Author(s): Hubert Chanson
Keywords: Tidal bores; Aegir; Pororoca; Hydrodynamics; Geophysical flows; Turbulent mixing; Secondary currents; Transient front; Mascaret; Benak; Bono; Burro
Abstract: Tidal Bores, aegir and pororoca are a surge of waters propagating upstream as the tidal flow turns to rising and the flood tide rushes into a funnel shaped river mouth. The bore forms during the spring tides when the tidal range exceeds 4 to 6 m and the rising tide waters are confined to the narrow funnelled estuary during the dry season. Herein the author aims to share his enthusiasm and passion for these geophysical wonders by explaining the basic theory, supported by field and laboratory observations. Behind the bore, some strong turbulent kinetic energy is produced next to the boundaries and some macro-turbulence is advected behind the tidal bore front. Transient fronts may also develop behind a bore inducing further secondary circulation. The paper intends to bridge the gap between the general knowledge, engineering practice and scientific expertise on the tidal bores.
Year: 2010