A large wave, or series of waves, that travels up a river or narrow bay against the current's usual direction, formed where an incoming tide funnels into a shallow, narrowing channel with enough force to overcome the river's outflow. The wave typically arrives as a distinct wall of turbulent water, sometimes several feet high, and can travel many miles upstream twice daily with the tidal cycle. China's Qiantang River hosts the largest recorded tidal bore, with a leading wave that has reached over nine meters in height and draws visitors every year.
Facts
PeriodicityOccurs only on the flood, incoming, tide, never on the ebb tide 1 ScaleThe Qiantang River bore, the world's largest, reaches up to 9 meters (30 feet) high and travels up to 40 kilometers per hour (25 miles per hour) 1 Sources
1. Tidal bore, Wikipedia
Lead section
A tidal bore takes place during the flood tide and never during the ebb tide.
Notable tidal bores section
has the world's largest bore, up to 9 m (30 ft) high, traveling at up to 40 km/h (25 mph)
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