μεταξάς μπρούσαλης


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μεταξάς μπρούσαλης

  1. 1. Wave energy has been used widely over the years byhumans as it is renewable and generates high level ofenergy. However it has advantages anddisadvantages… like the ones that you will see….Advantages • Wave The energy is free - no fuel needed, no waste produced. • Not expensive to operate and maintain. • Can produce a great deal of energy. power is a renewable Energy Source. • Wave Energy Is a Clean Fuel. • Wave Energy is Environmentally Friendly - it doesnt destroy the environment. • There is plenty of it. • Tides/Waves are always predictable. • you can always produce a significant amount of energy. • you dont need fuel so it doesnt cost that much . • Waves are free and will not run out so the cost is in building the power station.
  2. 2. • Wave power does not produce greenhouse gases.Disadvantages • Depends on the waves - sometimes youll get loads of energy, sometimes almost nothing. • Needs a suitable site, where waves are consistently strong. • Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem. • Must be able to withstand very rough weather. • Harnessing the power of it is difficult. • it can cost a lot of money and requires further research. • If the whole tidal/wave energy scheme does get popular real estate will be losing money for beach front houses since they will be using the beaches for the tidal/wind farms. • It depends where you put it for the costs so not much good financially • May interfere with mooring and anchorage lines commercial and sport fishing.
  3. 3. • Waves can be big or small so you may not always be able to generate electricity.• You need to find a way of transporting the electricity from the sea onto the land.• Not many people have tried to generate electricity this way yet so the equipment is expensive.• But the worst disadvantage is that a wave may turn into tsunami and then have great casualties just like the incident in Japan!!A tsunami is a series of waves when a body ofwater, like an ocean in rapidly displaced on amassive scale. The earthquakes, mass movements
  4. 4. above or below water, volcanic eruption and other underwater explosions.Japans most powerful earthquake since recordsbegan has struck the north-east coast, triggering amassive tsunami.Cars, ships and buildings were swept away by a wallof water after the 8.9-magnitude tremor, whichstruck about 400km (250 miles) north-east of Tokyo.A state of emergency has been declared at a nuclearpower plant, where pressure has exceeded normallevels.Officials say 350 people are dead and about 500missing, but it is feared the final death toll will bemuch higher.In one ward alone in Sendai, a port city in Miyagiprefecture, 200 to 300 bodies were found.In the centre of Tokyo many people are spending thenight in their offices. But thousands, perhaps millions,chose to walk home. Train services were suspended.Even after the most violent earthquake anyone couldremember the crowds were orderly and calm. The
  5. 5. devastation is further to the north, along the Pacificcoast.There a tsunami triggered by the quake reached10km (six miles) inland in places carrying houses,buildings, boats and cars with it. In the city of Sendaithe police found up to 300 bodies in a single ward.Outside the city in a built-up area a fire blazed acrossseveral kilometres.Japans ground self-defence forces have beendeployed, and the government has asked the USmilitary based in the country for help. The scale ofdestruction from the biggest quake ever recorded inJapan will become clear only at first light.The quake was the fifth-largest in the world since1900 and nearly 8,000 times stronger than the onewhich devastated Christchurch, New Zealand, lastmonth, said scientists.Thousands of people living near the Fukushimanuclear power plant have been ordered to evacuate.Japanese nuclear officials said pressure inside aboiling water reactor at the plant was running muchhigher than normal after the cooling system failed.
  6. 6. Officials said they might need to deliberately releasesome radioactive steam to relieve pressure, but thatthere would be no health risk.US Secretary of State Hillary Clinton had earlier saidthe US Air Force had flown emergency coolant to thesite.But US officials later said no coolant had beenhanded over because the Japanese had decided tohandle the situation themselves.The UNs nuclear agency said four nuclear powerplants had shut down safely.Measured at 8.9 by the US Geological Survey, itstruck at 1446 local time (0546 GMT) at a depth ofabout 24km. The tsunami rolled across the Pacific at 800km/h (500mph) - as fast as a jetliner -before hitting Hawaii and the US West Coast, butthere were no reports of major damage from thoseregions.
  7. 7. Thousands of people were ordered to evacuate coastalareas in the states of California, Oregon andWashington.The biggest waves of more than 6-7ft (about 2m) wererecorded near Californias Crescent City, said thePacific Tsunami Warning Centre. A tsunami warning extended across the Pacific to North and South America, where many other coastal regions were evacuated, but the alert was laterlifted in most parts, including the Philippines,Australia and China.Strong waves hit Japans Miyagi and Fukushimaprefectures, damaging dozens of coastal communities.A 10m wave struck Sendai, deluging farmland andsweeping cars across the airports runway. Firesbroke out in the centre of the city.
  8. 8. Japans NHK television showed a massive surge ofdebris-filled water reaching far inland, consuminghouses, cars and ships. Motorists could be seen tryingto speed away from the wall of water. This is the kindof earthquake that hits once every 100 years” saysAkira Tanaka Restaurant worker. Four trains aremissing along the coast, says Japan Railways; and aship carrying 100 people was swept away Fire hasengulfed swathes of the coast in Miyagi prefecturesKesennuma city, one-third of which is reportedlyunder water. A major explosion hit a petrochemicalplant in Sendai; further south a huge blaze swept anoil refinery in Ichihara city, Chiba prefecture Some1,800 homes are reported to have been destroyed inthe city of Minamisoma, Fukushima prefecture. Adam burst in north-eastern Fukushima prefecture,sweeping away homes, Kyodo news agency reports Atleast 20 people were injured in Tokyo when the roofof a hall collapsed on to a graduation ceremony In atelevised address, Prime Minister Naoto Kanextended his sympathy to the victims of the disaster.
  9. 9. As aftershocks rattled the country, residents andworkers in Tokyo rushed outside to gather in parksand open spaces. Many people in the Japanese capitalsaid they had never felt such a powerful earthquake.In central Tokyo, a number of office workers arespending the night in their offices because the liftshave stopped working. "This is the kind ofearthquake that hits once every 100 years," saidrestaurant worker Akira Tanaka. Train services weresuspended, stranding millions of commuters in theJapanese capital. About four million homes in andaround Tokyo suffered power cuts.The conclusion is that wave energy can provide wswith many energies but they are Also veryunpredictable and can cause mass destruction…