TIDAL
- Created by: wardk
- Created on: 13-10-17 12:37
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- TIDAL
- Availability, Intermittency & Reliability
- intermittent due to periods of still water so interferes with continuous demand
- very predictable as cycles can be known years in advance
- Location
- requires large tidal range & water volume
- economically suitable sites are rare
- Canada, France, Scotland & Korea has the worlds largest tidal plants
- coastal features can concentrate flow into estuaries or between land masses
- Technology
- Tidal Barrages - placed across estuary, restricts tidal flow through turbines by sluice gates
- La Rance, France has been running for the last 45yrs, consists of 24 turbines, 6 barrage gates & ship lock, successful, road collects tax, high power output
- In-Stream Turbines - anchored to seabed, rotates with tides, connected to generator
- Tidal Lagoons - enclosure structure along coastline, water flows into at HT, water held until LT,water flows out through turbines
- Tidal Barrages - placed across estuary, restricts tidal flow through turbines by sluice gates
- Energy Density
- large power output compared to other renewables
- Economics
- now commercial in France, Canada, US, China, and Korea
- Environmental Impacts
- Barrage/ Lagoon
- build up of pollutants
- reduced turbidity due longer periods of static water=richer food chains from increased light
- obstacle to ships & migrating fish
- helps prevent flooding during HT
- increased sediment in low energy areas
- construction materials from quarries + transport
- reduced tidal range, decreased feeding area for wading birds
- aesthetics
- In-stream turbines
- increased turbidity (laid fish eggs)
- power lines could electrocute foraging organisms
- disrupts ecosystem during construction, requires large sea cranes
- Barrage/ Lagoon
- Availability, Intermittency & Reliability
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