The environmental impact could be severe , depending on the size of the turbine and the site of the tidal stream. Turbines are most effective in shallow water. This produces more energy and allows ships to navigate around the turbines. A tidal generator's turbine blades also turn slowly, which helps marine life avoid getting caught in the system. The world's first tidal power station was constructed in at Strangford Lough in Northern Ireland. The turbines are placed in a narrow strait between the Strangford Lough inlet and the Irish Sea.
The tide can move at 4 meters 13 feet per second across the strait. Barrage Another type of tidal energy generator uses a large dam called a barrage.
With a barrage, water can spill over the top or through turbines in the dam because the dam is low. Barrages can be constructed across tidal river s, bay s, and estuaries. Turbines inside the barrage harness the power of tides the same way a river dam harnesses the power of a river. The barrage gates are open as the tide rises. At high tide, the barrage gates close, creating a pool, or tidal lagoon. The water is then released through the barrage's turbines, creating energy at a rate that can be controlled by engineers.
The environmental impact of a barrage system can be quite significant. The land in the tidal range is completely disrupted. The change in water level in the tidal lagoon might harm plant and animal life.
The salinity inside the tidal lagoon lowers, which changes the organisms that are able to live there. As with dams across rivers, fish are blocked into or out of the tidal lagoon. Turbines move quickly in barrages, and marine animals can be caught in the blades.
With their food source limited, birds might find different places to migrate. A barrage is a much more expensive tidal energy generator than a single turbine.
Although there are no fuel costs, barrages involve more construct ion and more machines. Unlike single turbines, barrages also require constant supervision to adjust power output. The tidal power plant at the Rance River estuary in Brittany, France, uses a barrage. It was built in and is still functioning.
The plant uses two sources of energy: tidal energy from the English Channel and river current energy from the Rance River. B It would replace all other forms of energy in Britain. C Its introduction has come as a result of public pressure. D It would cut down on air pollution. E It could contribute to the closure of many existing power stations in Britain. F It could be a means of increasing national income.
G It could face a lot of resistance from other fuel industries. H It could be sold more cheaply than any other type of fuel. I It could compensate for the shortage of inland sites for energy production. J It is best produced in the vicinity of coastlines with particular features. Please descibe the mistake as details as possible along with your expected correction, leave your email so we can contact with you when needed. Please enter description.
Please enter a valid email. Solution for: Tidal Power Answer Table 1. Follow us on Facebook Mini ielts. Tidal Power. Questions Reading Passage has six paragraphs, A-F. Which paragraph contains the following information? Equipment and facilities of tidal power can last a lot longer and be more cost-competitive than other renewable technologies. With an asset life of years, developments are made for future increases in sea-level. What is stopping us from making the most of tidal energy?
It is currently expensive to construct tidal power plants as they require high capital investments. Environmental issues such as habitat change, particularly with tidal barrages. Maintaining and repairing equipment can be a challenge. Limited energy demand. Powerful tides only happen normally 10 hours out of each day, this means the tidal energy storage capacity must be developed.
Difficult to provide tidal energy to coastal communities, as the energy produced by the tides is often a long distance from where the electricity will be used inland. Finally, atmospheric winds and the natural rotation of the Earth create ocean currents. Electricity is generated by capturing the power contained in these moving waters, and the global potential from tidal is substantial: an estimated 1, terawatt hours could be harnessed worldwide.
Canada is also among the few countries with expertise in ocean energy. The flow of water turns a turbine, which powers a generator, transforming mechanical energy into electricity.
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