A rip tide, or riptide, is a strong offshore current that is caused by the tide pulling water through an inlet along a barrier beach, at a lagoon or inland marina where tide water flows steadily out to sea during ebb tide. It is a strong tidal flow of water within estuaries and other enclosed tidal areas. The riptides become the strongest where the flow is constricted. When there is a falling or ebbing tide, the outflow water is strongly flowing through an inlet toward the sea, especially once stabilised by jetties.
The Menai Strait is a strait which separates the island of Anglesey from Gwynedd, on the mainland of Wales. It is situated between Caernarfon Bay in the south-west and Conwy Bay in the north-east, which are both inlets of the Irish Sea. The strait is about 25 km (16 mi) long and varies in width from 400 metres (1,300 ft) between Fort Belan and Abermenai Point to 7.5 kilometres (4.7 mi) between Puffin Island and Penmaenmawr. It contains several islands, including Church Island, on which is located St Tysilio's Church.
A whirlpool is a body of rotating water produced by opposing currents or a current running into an obstacle. Small whirlpools form when a bath or a sink is draining. More powerful ones formed in seas or oceans may be called maelstroms. Vortex is the proper term for a whirlpool that has a downdraft.
An inlet is a indentation of a shoreline, such as a small arm, cove, bay, sound, fjord, lagoon or marsh, that leads to an enclosed larger body of water such as a lake, estuary, gulf or marginal sea.
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.
Saltstraumen (Norwegian) or Stuorstrávve (Lule Sami) is a small strait with one of the strongest tidal currents in the world. It is located in Bodø Municipality in Nordland county, Norway. It is located about 10 km (6.2 mi) southeast of the town of Bodø. The narrow channel connects the outer Saltfjorden to the large Skjerstad Fjord between the islands of Straumøya and Knaplundsøya. The Saltstraumen Bridge on Norwegian County Road 17 crosses Saltstraumen.
Skookumchuck Narrows is a strait forming the entrance of Sechelt Inlet on British Columbia's Sunshine Coast in Canada. Before broadening into Sechelt Inlet, all of its tidal flow together with that of Salmon Inlet and Narrows Inlet must pass through Sechelt Rapids. At peak flows, standing waves, whitecaps, and whirlpools form at the rapids even in calm weather. The narrows are also the site of Skookumchuck Narrows Provincial Park.
Braye Harbour is the main harbour on the north side of the island of Alderney, in the Channel Islands, a dependency of the British Crown. A 3,000 feet (910 m) breakwater was built by the Admiralty to protect the Navy in the 19th century shelters Braye Harbour. The harbour faces out onto the Swinge, which is part of the English Channel, and it is at Braye that most of the island's freight comes in. Braye is more or less a suburb of St Anne, the island capital; the centre of St Anne lies approximately 1 mile from the harbour.
Sechelt Inlet formerly Seechelt Inlet is one of the principal inlets of the British Columbia Coast. The inlet is significant in that it almost makes an island of what is instead the Sechelt Peninsula, whose isthmus is at the town of Sechelt at the head of the inlet. The isthmus is less than 1.2 km (0.75 mi) in length. Sechelt Inlet's mouth is at Jervis Inlet, inland from the Malaspina Strait.
Skookumchuck is a Chinook Jargon term that is in common use in British Columbia English and occurs in Pacific Northwest English. Skookum means "strong" or "powerful", and "chuck" means water, so skookumchuck means "rapids" or "whitewater", or fresh, healthy water. It can mean any rapids, but in coastal usage refers to the powerful tidal rapids at the mouths of most of the major coastal inlets.
A tide mill is a water mill driven by tidal rise and fall. A dam with a sluice is created across a suitable tidal inlet, or a section of river estuary is made into a reservoir. As the tide comes in, it enters the mill pond through a one-way gate, and this gate closes automatically when the tide begins to fall. When the tide is low enough, the stored water can be released to turn a water wheel.
Seymour Narrows is a 5-kilometre (3.1 mi) section of the Discovery Passage in British Columbia known for strong tidal currents. Discovery Passage lies between Vancouver Island at Menzies Bay, British Columbia and Quadra Island except at its northern end where the eastern shoreline is Sonora Island. The section known as Seymour Narrows begins about 18 km (11 mi) from the south end of Discovery Passage where it enters the Georgia Strait near Campbell River. For most of the length of the narrows, the channel is about 750 metres (820 yd) wide. Through this narrow channel, currents can reach 15 knots.
The Bitches are a tidal race and set of rocks between Ramsey Island and the west Welsh coastline near St Davids. They are a popular tourist destination and a playspot for extreme waterboarding enthusiasts such as whitewater kayakers and surfers.
In kayaking, a playspot is a place where there are favorable stationary features on rivers, in particular standing waves, 'holes' and 'stoppers', where water flows back on itself creating a retentive feature, or eddy lines.
The following outline is provided as an overview of and introduction to Oceanography.
Quatsino Sound is a complex of coastal inlets, bays and islands on northwestern Vancouver Island in the Canadian province of British Columbia. It is the northernmost of the five sounds that pierce the west coast of Vancouver Island, the others being Kyuquot Sound, Nootka Sound, Clayoquot Sound, and Barkley Sound.
Nitinat Lake is a large lake and inlet on the southwestern coast of Vancouver Island, British Columbia, Canada. The lake is about 150 km (93 mi) northwest by road from Victoria, BC's capital on the southern tip of Vancouver Island, and about 60 km (37 mi) southwest by road from the town of Lake Cowichan. The city of Port Alberni is about 80 km (50 mi) by road to the north.
A tidal stream generator, often referred to as a tidal energy converter (TEC), is a machine that extracts energy from moving masses of water, in particular tides, although the term is often used in reference to machines designed to extract energy from the run of a river or tidal estuarine sites. Certain types of these machines function very much like underwater wind turbines and are thus often referred to as tidal turbines. They were first conceived in the 1970s during the oil crisis.
Cyclone Anne was a European windstorm which caused €75 million in damage across western Europe in early January 2014, followed days later by Cyclone Christina.
The Alderney Race is a strait that runs between Alderney and Cap de la Hague, a cape at the northwestern tip of the Cotentin Peninsula in Normandy. A strong current runs through the race north of the Passage de la Déroute, a treacherous passage separating the Cotentin from the Channel Islands. The current is intermittent, varying with the tide, and can run up to about 12 knots during equinoctial tides. The French call it Raz Blanchard. In Norman French it is called L'Raz.
