By Baker, A. Clive
This e-book describes how huge tides advance specifically areas and the way the strength might be extracted through development compatible barrages
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Extra info for Tidal power
4 shows the results of sensitivity tests of the effects of early or late starting on energy output for different tidal ranges (Ref. 1986(13)). This demonstrates that starting head is less critical, in percentage terms, for spring tides than neap tides, partly because a tidal barrage is likely to have an installed generator capacity which is less than that needed to generate the power available during relatively few large spring tides, so that the turbines have to be throttled for a while in any case.
Three other points come out. Firstly, for maximum energy production, the turbines do not start until well after the sea has started to ebb, typically about three hours. Secondly, the maximum water level in the basin is only slightly below high water on the seaward side of the barrage. This is important because every drop of water let into the basin represents energy to be won. Thirdly, the new minimum water level in the basin is close to normal mean sea level, reached when the head across the turbines is the minimum at which they can operate properly.
10 shows the proportions adopted for the water passage for the Severn barrage in Ref. 1981 (1). These were based on published data for run-of-river schemes modified to allow for the concept of a concrete caisson. The sharp edge to the inlet would have to be rounded to improve flow.
Tidal power by Baker, A. Clive