Tidal bore youtube8/17/2023 In the Bay of Fundy region there are several excellent places both to watch a tidal bore from the shore or to ride its waves with an adventure tour company. Many people have likened the sound to that of an approaching railway train, and first-time viewers are usually struck with awe. At high tide, the extraordinary volume of water in the Bay floods into these rivers and, as the river banks narrow, the compressing waters rise in a spectacular surge and a visible standing wave, sometimes 1 meter (3 ft) in height! As the maelstrom of roaring, churning water races upstream at speeds close to 15 km per hour (10 mph) it generates rapids in its wake that are between 3 and 3.5 meters (10-12 ft) high. The Chignecto Bay and Minas Basin form two arms at the head of the Bay, fed respectively by the Peticodiac River and the Salmon River. It is quite a spectacle and often draws crowds of onlookers. One of the places where this spectacle occurs is at the head of the Bay of Fundy. This is one of about twenty tidal bores that occurs in the UK and is named after the village of Arnside. 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. These are normally places with a large tidal range where incoming tides are funnelled into a shallow, narrowing river or lake via a broad bay. Tidal bores occur in just a few locations worldwide. Large bores can be particularly dangerous for shipping, but also present opportunities for river surfing. 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). Tidal bores takes place twice a day during the flood tide and never during the ebb tide. The word bore derives through Old English from the Old Norse word bara, meaning a wave or swell.Ī 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. Historical Activities: Travel Back in TimeĪ 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. Bay of Fundy Tides: The Highest Tides in the World!.A tidal bore creates a powerful roar that combines the sounds caused by the turbulence in the bore front and whelps, entrained air bubbles in the bore roller, sediment erosion beneath the bore front and of the banks, scouring of shoals and bars, and impacts on obstacles.īelow are some videos of surfing tidal bores in Sumatra, Indonesia (the "Bono") in Haining Province, China in Amapa State, Brazil and even the Ganges River in India. Two key features of a tidal bore are the intense turbulence and mixing generated during the bore propagation, as well as its rumbling noise. Large bores can be particularly unsafe for shipping but also present opportunities for river surfing. The funnel-like shape not only increases the tidal range, but it can also decrease the duration of the flood (incoming) tide, down to a point where the flood appears as a sudden increase in the water level.Ī tidal bore may take on various forms, ranging from a single breaking wavefront with a roller - somewhat like a hydraulic jump - to "undular bores", comprising a smooth wavefront followed by a train of secondary waves (whelps). For more information on this Alaska surfing hotspot check out some Alaska bore tide videos on YouTube, including this one by NuttyNu. A tidal bore is a phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travels up a river or narrow bay against the direction of the river or bay's current.īores occur in relatively few locations worldwide, usually in areas with a large tidal range (typically more than 6 meters (20 ft) between high and low water) and where incoming tides are funneled into a shallow, narrowing river or lake via a broad bay.
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