A tidal bore is a tidal phenomenon in which the leading edge of the incoming tide forms a standing wave of water that travels upstream, against the current of a river or narrow bay. The word bore derives through Old English from the Old Norse word bara, meaning a wave or swell.
A tidal bore is indeed a true tidal wave and is not to be confused with a tsunami, which is a large ocean wave traveling primarily on the open ocean. Tidal bores take place twice a day during the flood tide and never during the ebb tide. A tidal bore may take on various forms, ranging from a single breaking wavefront with a roller to a smooth wavefront followed by a train of secondary waves (whelps). Large bores can be particularly dangerous for shipping, but also present opportunities for river surfing.
Tidal bores occur in just a few locations worldwide. These are normally places with a large tidal range where incoming tides are funneled into a shallow, narrowing river or lake via a broad bay. The funnel-like shape both increases the height of the tide and decreases the duration of the flood tide so it appears as a much more sudden increase in the water level.
The Tidal Bore in New Brunswick, Canada, occurs along the Petitcodiac River near Moncton & Riverview and is a naturally occurring phenomenon that is caused by the surging waters from the Bay of Fundy tides which are the highest tides in the world, that roar up the Petitcodiac River twice daily during the changing tides.
The Tidal Bore occurs twice per day and creates a thick wave of water from the higher waters in the bay Bay of Fundy which run up the placid Petitcodiac River and roll back upstream in one wave, which can vary in height from 3 cm (1 in.) to 60 cm (24 in.).
Just as spectacular is the rapid and dramatic change in the river itself. At low tide, the muddy river bottom is often visible, but within an hour of the arrival of the Tidal Bore, the water level rises some 7.5 m (25 ft.), filling the river to its banks.
Surfers even can take a surf on The Petitcodiac River as the Tidal Bore passes through.
Find all information you need to know before experiencing the rising of the Tidal Bore in Moncton HERE.