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Tidal bore

A tidal bore, often simply given as bore in context, is a tidal phenomenon in which the leading edge of the incoming tide forms a wave of water that travels up a river or narrow bay, reversing the direction of the river or bay's current. It is a strong tide that pushes up the river, against the current.

Etymology
The word bore derives through Old English from the Old Norse word bára, meaning "wave" or "swell." ==Effects==
Effects
Tidal bores can be dangerous. Certain rivers such as the Seine in France, the Petitcodiac River in Canada, and the Colorado River in Mexico to name a few, have had a sinister reputation in association with tidal bores. In China, despite warning signs erected along the banks of the Qiantang River, a number of fatalities occur each year by people who take too much risk with the bore. in Wales in the United Kingdom, the Garonne and Sélune in France, the Daly River in Australia, and the Qiantang River estuary in China. The force of the tidal bore flow often poses a challenge to scientific measurements, as evidenced by a number of field work incidents in the River Dee, Rio Mearim, Daly River, and Sélune River. In terms of physical modelling (hydrodynamics), a tidal bore often well represented by a soliton. ==Rivers and bays with tidal bores==
Rivers and bays with tidal bores
Rivers and bays that have been known to exhibit bores include those listed below. Asia tidal bore overwhelming local infrastructure in 2024 • GangesBrahmaputra, India and BangladeshIndus River, India and PakistanSittaung River, BurmaQiantang River, China, which has the world's largest bore, Oceania AustraliaStyx River, QueenslandDaly River, Northern Territory New ZealandWairoa River, Northland Region Papua New GuineaFly RiverTurama River Europe IrelandRiver Shannon, up the Shannon Estuary to Limerick, Ireland: 21 September 2013 United Kingdom , 20 September 2005 , 20 September 2005 • River Dee, Wales and EnglandRiver Mersey. The second highest tidal bore after the Severn bore, up to high. The bore tends to form around the Manchester Ship Canal. • The Severn bore on the River Severn, Wales and England, up to high • The Trent Aegir on the River Trent, England, up to high. Also other tributaries of the Humber Estuary. • River ParrettRiver Welland • The Arnside Bore on the River KentRiver Great OuseRiver Ouse, Yorkshire. Like the Trent bore, this is also known as "the Aegir". • River EdenRiver EskRiver Nene. This was also known as the Eagre. • River NithRiver Lune, Lancashire • River Ribble, Lancashire • River Yealm, DevonRiver Leven, Cumbria BelgiumDurme, Flanders France The phenomenon is generally named un mascaret in French. but some other local names are preferred. The restoration of the bore has been sufficient that in July 2013, professional surfers rode a -high wave up the Petitcodiac River from Belliveau Village to Moncton to establish a new North American record for continuous surfing. • The Shubenacadie River in Nova Scotia. When the tidal bore approaches, completely drained riverbeds are filled. It has caused the deaths of several tourists who were in the riverbeds when the bore came in. Tour boat operators offer rafting excursions in the summer. • The bore is fastest and highest on some of the smaller rivers that connect to the bay including the River Hebert and Maccan River on the Cumberland Basin, the St. Croix and Kennetcook rivers in the Minas Basin, and the Salmon River in Truro. Mexico Historically, there was a tidal bore on the Gulf of California in Mexico at the mouth of the Colorado River. It formed in the estuary about Montague Island and propagated upstream. It was once very strong, but diversions of the river for irrigation have weakened the flow of the river to the point the tidal bore has nearly disappeared. South America BrazilAmazon River in Brazil, up to high, running at up to . It is known locally as the pororoca. • Mearim River in Brazil • Araguari River in Brazil. Very strong in the past, it is considered lost since 2015, due to buffaloes farming, irrigation, and dam construction along the river, leading to substantial loss of water flow. VenezuelaOrinoco River in Venezuela ChileSouthern Channels, ex. Canal de Castro, Chiloé Island (fjord of Castro) in Chile ==Lakes with tidal bores==
Lakes with tidal bores
Lakes with an ocean inlet can also exhibit tidal bores. North AmericaNitinat Lake on Vancouver Island has a sometimes dangerous tidal bore at Nitinat Narrows where the lake meets the Pacific Ocean. The lake is popular with windsurfers due to its consistent winds. ==See also==
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