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 Unit 1: Water Power ◦ 1.1 Hydro ◦ 1.2 Tidal ◦ 1.3 Wave ◦ 1.4 OTEC.

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Presentation on theme: " Unit 1: Water Power ◦ 1.1 Hydro ◦ 1.2 Tidal ◦ 1.3 Wave ◦ 1.4 OTEC."— Presentation transcript:

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3  Unit 1: Water Power ◦ 1.1 Hydro ◦ 1.2 Tidal ◦ 1.3 Wave ◦ 1.4 OTEC

4  What is a tide?  What causes the tides?  How often do tides occur?  What is tidal power?  How can oceanic currents be viewed as an energy source?

5  What are the pros/cons of tidal power?  How does tidal power affect the environment?

6  Tides are periodic variations in the level of the water in oceans or in the bays/inlets that connect directly to them But what causes tides???

7 Tides are caused by the gravitational pull of the Moon and the Sun. Since the Moon is closer, its effect is more than double that of the Sun. Tides repeat themselves once every 12 hours and 25 minutes - or twice a lunar day - which is the time it takes for Earth to rotate once relative to the Moon.

8 200 A.D. 1966 Tidal mills may have been used by Romans to grind grains La Rance Tidal Barrage commissioned in France 900 A.D.1157 Naturally occurring basins were converted to tidal barrages and used to spin waterwheels which powered mills for grinding grains. Farmers built ponds to trap seawater from rising tides in order to power tidal mills for grinding grain. 1980 1984 Jiangxia Tidal Barrage commissioned in China Baltimore Polytechnic Institute was founded North America’s first and only tidal generating station was built in Annapolis Royal, Nova Scotia. 2009 North America's first and only commercial- scale in-stream tidal turbine deployed in Minas Passage: NSPI/OpenHydro 1 megawatt device. 1883

9 200 A.D. 1966 Tidal mills may have been used by Romans to grind grains La Rance Tidal Barrage commissioned in France 900 A.D.1157 Naturally occurring basins were converted to tidal barrages and used to spin waterwheels which powered mills for grinding grains.. Farmers built ponds to trap seawater from rising tides in order to power tidal mills for grinding grain. 1980 1984 Jiangxia Tidal Barrage commissioned in China North America’s first and only tidal generating station was built in Annapolis Royal, Nova Scotia. 2009 North America's first and only commercial- scale in-stream tidal turbine deployed in Minas Passage: NSPI/OpenHydro 1 megawatt device.

10 200 A.D. 1966 Tidal mills may have been used by Romans to grind grains La Rance Tidal Barrage commissioned in France 900 A.D.1157 Naturally occurring basins were converted to tidal barrages and used to spin waterwheels which powered mills for grinding grains.. Farmers built ponds to trap seawater from rising tides in order to power tidal mills for grinding grain. 1980 1984 Jiangxia Tidal Barrage commissioned in China North America’s first and only tidal generating station was built in Annapolis Royal, Nova Scotia. 2009 North America's first and only commercial- scale in-stream tidal turbine deployed in Minas Passage: NSPI/OpenHydro 1 megawatt device.

11  Tidal Barrages & In-stream Turbines  Impacts on Environment/Society

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