Offshore impoundment

An alternative to estuary tidal generation is the concept of the tidal pound. The idea is not new as mentioned earlier. The system is ideal for situations in which there is a significant tidal range and shallow tidal flats encountered in many coasts of the UK. The system consists

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Figure 11.11 The shape and generating phases of tidal impoundment

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Figure 11.11 The shape and generating phases of tidal impoundment of an oval barrage built from locally sourced loose rock, sand and gravel similar in appearance to standard coastal defences. It is divided into three or more segments to allow for the phasing of supply to match demand. According to Tidal Electricity Ltd., computer simulations show that a load factor of 62% can be achieved with generation possible 81% of the time. Tidal pounds would be fitted with low-head tidal generating equipment that is a reliable and mature technology (see Fig. 11.11).

There is a technology which overcomes most of the problems associated with barrage schemes whilst generating power on an equivalent scale. It is known as the 'tidal energy bridge' or 'tidal fence' which can be conceived as a bridge with numerous supports. Vertical axis turbines are contained within a concrete structure which allows the free flow of water at all times. The bridge structure reduces the cross-sectional area of an estuary location, thereby increasing the rate of flow by up to a factor of four. It is a system as efficient in tidal streams and coastal currents as on an estuary site. The UK is one of the most favoured of all locations in this respect. Of all the renewable technologies, large-scale tidal is one of the most likely candidates as a substitute for a new generation of nuclear plants. Spread round the most suitable locations with varying tide times this system could provide reliable base load electricity for an electricity infrastructure which will become increasingly reliant on intermittent suppliers (see Fig. 11.12). The prime candidate is the Seven estuary.

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Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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