Places to see seals and migrating waterbirds such as barnacle geese Visit suggestions for picturesque harbours, Roman ruins and sea cliffs Ideas for visits to nearby seaside resorts, nature reserves and tourist attractions Ideas for places to visit in nearby towns and cities such as Gloucester, Cardiff, Chester, Liverpool, Ulverston, Dumfries and Hull Insights into how historic river engineering works for shipping have affected tidal bores Tips on finding out tide times and how the tides affect tidal bores Viewing tips for the featured tidal bores including suggested viewpoints and indicative timings Ten featured tidal bores around the coast of the UK and brief descriptions for several more The featured tidal bores include the Severn Bore in Gloucestershire, the Dee Tidal Bore in Wales, the Arnside Bore in Cumbria, Nith Tidal Bore in Scotland and the Trent Aegir in east England. The Guinness World Record for the longest ride on a river bore belongs to James Cotton, an Australian surfer who rode Indonesia's Kampar River wave for 10.6 miles (17.2 kilometers) and at an average speed of 12.5 miles per hour (20 km/h).Important If considering trying to spot a tidal bore, be sure to get appropriate safety advice first since they occur on some of the highest and most powerful tides of the year. The Baan (Hooghly River, Kolkata, India).Turnagain Arm (Cook Inlet, Gulf of Alaska, Anchorage, USA).Bay of Fundy (Petitcodiac River, Moncton, Canada).Le Mascaret (Seine River, Le Havre, France).Severn (River Severn, Gloucester, England).Silver Dragon (Qiantang River, Haining Province, China).Pororoca (Araguari River, São Domingos do Capim, Brazil).Tidal wave events have been attracting a growing number of surfers, who time the passage of the wave and ride it for several miles. Historians have confirmed that the phenomenon has attracted huge crowds for at least 3,000 years. "When a full moon occurs, the mismatch in size between the local bay and the much narrower river amplifies the effect of the tide creating a powerful tidal bore wave. The world's largest tidal bore takes place in the Qiantang River, near Hangzhou, in China.Įvery year, and halfway through the eighth month of the Chinese lunar calendar, thousands of locals and tourists gather on the margins of the Qiantang River to witness the "Silver Dragon." But, unlike tsunami waves, the time, strength, and size of tidal bores can be predicted. Despite all the warnings, the world's most powerful tidal bores have already claimed several lives.īecause they're rare and extremely violent, they are often mistakenly seen as tsunamis. This turbulent wave phenomenon generates a roaring noise that can be heard far away. These tide-influenced waves are so violent that they tear vegetation and bring up sediments and sand from the bottom of the river, changing its colors from green and blue to chocolate-brown. They can blast roads, smash small houses, and wreck cars and landmarks. Tidal bores can have powerful and destructive consequences, especially in the margins of the rivers. In most cases, a bore will feature a single-breaking wave that travels at speeds of up to 25 miles per hour (40 km/h).īut it can also be comprised of a leading-edge wave followed by secondary and smaller rollers. As a result, there are only around 60 tidal bores on the planet. A tidal bore, also known as a surge, is a massive and often single wave caused by the constriction of an incoming spring tide as it gets funneled up a narrow and shallow river.īores are relatively rare and usually only occur in regions with a tidal range of more than 20 feet, i.e., in areas where there are huge water level differences between low and high tide.Īs the set of waves funnels into a narrow river, bay, or lake, they accumulate energy and accelerate against the natural direction of the stream.Ī tidal bore will only occur when the tide is rising (flood tide) and never when the tide is falling (ebb tide).
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