#
Under-estimation of the UK Tidal Resource

##
David J C MacKay

A widely-quoted estimate of the practical
UK tidal resource is
12 TWh/y (Black and Veatch, 2005).
I believe this is an underestimate, because
it is based on an incorrect physical model of
the flow of energy in a tidal wave.
In a shallow-water-wave model of tide, the true flow
of energy is greater than the Black-and-Veatch
flow by a factor of *d/h*, where
*d* is the water depth and *h* is the tide's vertical amplitude.
The tidal resource may therefore have been underestimated by
a factor of about 10.

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