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Dams 10 1 final

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  • 1. DAMS http://www.cromwell.org.nz/aerial_photos/images/Clyde%20Dam_jpg.jpg http://www.centralbasin.org/blog/wp-content/uploads/2009/03/hoover-dam-directions.jpg http://www.goodlife.com.ng/uploads/Yeunde-Farinloye_120_dam1.gif http://www.destination360.com/north-america/us/nevada/las-vegas/images/s/las-vegas-hoover-dam.jpg http://www.physics.uiowa.edu/~umallik/adventure/nov_06-04/Grand%20Coulee%20Dam.jpg
  • 2. Dam Structure http://www.americanwhitewater.org/photos/archive/medium/18665.jpg
  • 3. Dam Structure 2 http://4.bp.blogspot.com/_GmlJ2al7e_k/Su2-BeKr25I/AAAAAAAAGwc/QsNga5IwUT8/s400/damgif
  • 4. Dam Structure
    • Impermeable Membrane
    • Strength
    • Outlet Valve
    • Spillway
    http://www.parks.ca.gov/pages/500/images/folsomdam.jpg (5)
  • 5. Types of Dams
    • Concrete
    • Gravity
    • Arch & Buttress
    • Fill (Embankment)
    • Earth
    • Earth & Rock Fill
    • Concrete Faced Rock Fill
    (5)
  • 6. Uses of Dams
    • To provide H 2 O (towns/irrigation)
    • To store waste (from mines)
    • To generate electricity
    • To help control floods
    (5)
  • 7. Positive Sides of Dams
    • 20% of electrical energy production
    • Cheap energy
    • Long life
    • Attracting tourists
    (5)
  • 8. Negative Impacts of Dams http://upload.wikimedia.org/wikipedia/commons/b/b5/Arch_dam_Oymapinar_%28Manavgat_River,_Turkey%29.JPG
  • 9. Impacts on Water Diversion
    • Upstream ->stationary reservoir:
    • standing water for long periods 1
    • organic material-> decompose-> consume the limited oxygen-> dead zones 1
    • algae growth (toxic for rivers) 1
    • temperatures: too low at the bottom and too high on the surface no turnover 1
  • 10.
    • Downstream:
    • Depends on the season-long periods without flow 2
    • Flow-high Energy of water- moves rocks, sand, sediments 1
    • Water- polluted, without oxygen, smells rotten (sulphurous hydrogen disposal) 2
    • The ecosystem-damaged 2
  • 11. Impact on Fish 5
    • http://inadawords.com/wp-content/uploads/2008/01/nemo.jpg
    • Dams prevent the migration: salmon ->river-> sea
    • Fish cannot pass the dam ->not enough food-> die
    • Slow moving water: many fish-> victims of predators
    • No circulation (t is not balanced), not enough oxygen, toxic water ->death
  • 12. Impacts on Human
    • People have to abandon their home, agricultural lands, environment-> start living in a new way, adjust to new conditions 4
    • Collapse: lack of precise engineering 3 , too much rain 4
    • “ China is plagued by the world's worst dam hazards” (Minister Chen) , rainfalls, earthquakes 4
  • 13.
    • Immediate evacuation
    • Causes: floods-> death of many people, environmental destructions 4
    • Living near dam-dangerous(esp. in China) 4
    http://news.nationalgeographic.com/news/2005/08/photogalleries/New_Orleans_flood/images/primary/katrina28.jpg http://www.ecy.wa.gov/programs/wr/dams/Images/Taiwan_Dam_Failure_16Sta5_Dam.jpg
  • 14. Aswan Dam http://geoeyemediaportal.s3.amazonaws.com/assets/images/gallery/manmade/structures/hires/aswan_dam.jpg http://upload.wikimedia.org/wikipedia/commons/6/6a/Lake_Nasser_location.png
  • 15. Aswan Dam
    • Aswan Dam is the general name for two dams – High and Low dam.
    • Low – constructed in 1902
    • High – 1970
    • Aim = to increase the economic production trough regulating the annual river flooding
    http://farm1.static.flickr.com/111/295438443_40c30138e6.jpg (8)
  • 16. Aswan Da m - Benefits
    • Decreased the effect of the dangerous floods – 1964 and 1973
    • Increased the farmland drastically
    • Powered a huge amount of the country
    (8)
  • 17. Aswan Dam Enviromental and cultural problems
    • Flooding lower Nubia
    • Silt held back
    • Logging soils
    • Erosion
    • Endangering historical sites
    (8)
  • 18. Aral Sea D am http://upload.wikimedia.org/wikipedia/commons/8/85/Aral_map.png http://guanakolandia.files.wordpress.com/2010/04/mar-de-aral-aral-sea-dam_788415c.jpg
  • 19. Aral Sea
    • One of the biggest lakes on Earth
    • Located in Central Asia between Kazakhstan, and Uzbekistan
    • Dam project in 2005 in order to save the Aral Sea
    (7)
  • 20. Aral Sea
    • Nearly destroyed ecosystems!
    • Health problems for people
    • Almost no fishing industry
    http://upload.wikimedia.org/wikipedia/commons/9/95/Aral_Sea_1989-2008.jpg (7)
  • 21. Last hope – the dam
    • The last attempt to save the sea was to build a Dam
    • Water lever raised by 12m
    • Salinity was dropped
    • Fishing rates raised again
    (7)
  • 22. Work Cited
    • 8. Antelava, Natalya. &quot;BBC NEWS | Asia-Pacific | Dam Project Aims to save Aral Sea.&quot; BBC NEWS | News Front Page . BBC, 9 Apr. 2007. Web. 14 June 2010. <http://news.bbc.co.uk/2/hi/asia-pacific/6538219.stm>.
    • 6. Antelava, Natalya. “Dam project aims to save Aral Sea .” BBC News . BBC, 2010. Web. 14 June 2010. <http://news.bbc.co.uk/‌2/‌hi/‌asia-pacific/‌6538219.stm>.
    • 3. Kelly, Peggy. “Cause of St. Francis Dam collapse more concrete than initially verified.” Santa Paula Times Online . Santa Paula Times, 2010. Web. 14 June 2010. <http://www.santapaulatimes.com/‌news/‌fullstory.php/‌aid/‌18775/‌Cause_of_St._Francis_Dam_collapse_more_concrete_than_initially_verified.html,>.
    • 4. “More than 37,000 Chinese dams could collapse from excess rain.” AsiaNews.it . Autogestione contenuti di AsiaNews, 8 May 2009. Web. 14 June 2010. <http://www.asianews.it/‌news-en/‌More-than-37,000-Chinese-dams-could-collapse-from-excess-rain-15189.html>.
    • 1. “Poorly Run Hydro.” Dam Effects . Hydropower Reform Coalition, 2009. Web. 14 June 2010. <http://www.dameffects.org/>.
    • 2. Sait TAHM&#304;SC&#304;O&#286;LU, M., et al. “POSITIVE AND NEGATIVE IMPACTS OF DAMS.” DSI . N.p., 2007. Web. 14 June 2010. <http://www.dsi.gov.tr/‌english/‌congress2007/‌chapter_2/‌60.pdf>.
    • 5. Smith, S. E. “Why are Dams Potentially Harmful to Fish?” Wise Geek . conjecture corporation , 12 Apr. 2010. Web. 14June 2010. <http://www.wisegeek.com/‌why-are-dams-potentially-harmful-to-fish.htm>.
    • 7. &quot;The Kazakh Miracle: Recovery of the North Aral Sea.&quot; Environment News Service . Environment News Service (ENS), 1 Aug. 2008. Web. 14 June 2010. <http://www.ens-newswire.com/ens/aug2008/2008-08-01-01.asp>.