View source for Astronomy:Tidal race

'''Tidal race''' or '''tidal rapid''' is a natural occurrence whereby a fast-moving tide passes through a constriction, resulting in the formation of waves, eddies and hazardous currents. The constriction can be a passage where the sides narrow, for example the Gulf of Corryvreckan and the Saltstraumen maelstrom, or an underwater obstruction (a reef or rising seabed), such as is found at the Portland Race.

In extreme cases, such as Skookumchuck Narrows in British Columbia, through which tides can travel at more than 17 knots, very large whirlpools develop, which can be extremely hazardous to navigation.

==Notable tidal races==
* Cape Reinga in New Zealand
* Skookumchuck Narrows in British Columbia, Canada
* The Bitches in Wales, United Kingdom<ref>"[http://www.ffynnongron.com/leisure-activities-eat-drink/nature.html Nature]"</ref><ref>[http://www.the-bitches.co.uk/ The-Bitches.co.uk]</ref><ref>[http://www.ukriversguidebook.co.uk/swales/bitches.htm UK Riversguidebook]</ref><ref>[http://www.canoewales.com/the-bitches.aspx CanoeWales] {{Webarchive|url=https://web.archive.org/web/20140911215144/http://www.canoewales.com/the-bitches.aspx |date=2014-09-11 }}</ref><ref>"[http://www.ramseyisland.co.uk/ramsey-and-the-outer-islands/the-bitches-rocks/ Bitches and Tides]"</ref>
* Falls of Lora in Scotland, United Kingdom
* Portland Bill on the Isle of Portland, United Kingdom
* The Alderney Race (12 knots+) on Alderney
* [[Astronomy:Horizontal Falls|Horizontal Falls]] in Western Australia, Australia
* Naruto Strait between Shikoku and Awaji Islands, Japan
* Reversing Falls in Saint John, New Brunswick, Canada

==See also==
* {{annotated link|Earth:Rip current}}
* {{annotated link|Physics:Tidal bore}}

==Sources==
{{Reflist}}

{{Physical oceanography}}

{{DEFAULTSORT:Tidal Race}}
[[Category:Tides]]

{{Sourceattribution|Tidal race}}