Tidal power by Baker, A. Clive

By Baker, A. Clive

This publication describes how huge tides advance particularly locations and the way the power might be extracted through development compatible barrages

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1987(6)). In general, the high cost of the civil engineering works offsets the benefit of more uniform output. The next alternative would be to move the turbines towards one end of the dividing wall between the two basins, and install additional sluices between each basin and the turbines (Fig. 10£). This allows the turbines to be fed either from the sea into the low basin, or from the high basin to the sea, or from the high basin to the low basin. This can be beneficial in increasing the flexibility of the scheme to generate power at times when this is more valuable than normal.

This conclusion applies to the Severn estuary. Elsewhere, high water of spring tides will be concentrated around a different time of the day, so that tides which will allow advantage to be taken of tariff changes will lie in a different part of the spring-neap cycle. There are further factors to be considered with pumping at high tide. Firstly, since it has been demonstrated that the number of tides where a beneficial change in tariff can be exploited is limited, the turbines should be designed so that there is little or no reduction in the efficiency of the turbines when operating in normal ebb-generation mode; otherwise there will be a loss in overall output.

Nevertheless, it demonstrated the application of the general method where the construction period was short and periods of severe river flooding had to be avoided. 2 m diameter runners, again to a tight programme, this being the Vidalia project, already mentioned and also in the United States. Studies for the second Severn barrage Committee (Ref. 1981(1)) showed that the turbines for the Severn barrage should not be installed in the caissons before float-out. The main reason is that the caissons should be installed as fast as they are completed so that the barrage can be put to work as soon as possible, using as many turbines as are available at the time.

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