TIDAL FLOW

Tides are caused by the gravitational pull of the moon and the sun acting on the oceans of the rotating earth; forces that are entirely predictable and reliable.  This causes the regular and periodical raising and lowering of ocean surfaces, which produces the strong tidal streams or currents that are prevalent around Scotland.


The strength of the tidal current varies depending on the position of the site on the earth, the shape of the coastline and the bathymetry (shape of the sea bed).  Areas that

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How tides are formed.
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have high tidal currents are in narrow straits, between islands, around headlands, entrances to lochs, bays and large harbours.  This flow is cyclical, first increasing in velocity and then decreasing before switching to the opposite direction. © Scottish Renewables


Ocean currents are driven by other forces, including the convection flows of currents such as the gulf stream, bringing warm water from the Gulf up to the West Coast of Britain.  These currents are generally slower than tidal currents.

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