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Impact of dams roumenova yanev_yaramov_10_4

Impact of dams roumenova yanev_yaramov_10_4






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    Impact of dams roumenova yanev_yaramov_10_4 Impact of dams roumenova yanev_yaramov_10_4 Presentation Transcript

    • By Violeta Roumenova, Daniel Yanev, & Emil Yaramov 10/4
    • Environmental Impact
      • The turbines slow the water which then contains very little sediment which can lead to destruction of riverbanks (7.)
      • Lack of fish ladder blocks natural migration paths of fish-may
      • Might produce very high amounts of greenhouse gases (4.)
      • Contribute to earthquakes (3.)
    • The Turbines Slow the Water
      • Fast water flowing from the river holds sediments
      • When it goes to the dam the water becomes very slow which leads to sedimentation (7.)
      • This increases the erosion down the river which can lead to destruction of river banks
      • This can be controlled by dredging and protecting the natural vegetation cover (7.)
    • Lack of Fish Ladder Blocks
      • Lack of fish ladder blocks natural migration paths of fish
      • May lead to destruction of an entire ecosphere
      • This can be fixed by regulating the downstream flow and clearing natural vegetation (7.)
    • High Amounts of Greenhouse Gases
      • The vegetation flooded by the reservoir rots producing methane as they decay
      • When methane rises most of it oxidizes to form carbon dioxide (4.)
      • 95% of the methane produced is emitted at spillways, turbines and downstream
      • Have higher global warming impact than fossil fuel plants (4.)
    • http://ngadventure.typepad.com/blog/2008/08/the-adventure-6.html
    • Contribution to Earthquakes
      • Two theories
      • The mass of the water alters the stress points on the bedrock causing it to move (adjust) (3.)
      • Increases the groundwater pressure causing stress on the bedrock
      • Causes micro-seismic activity (<4.0 Hoover dam) (3.)
    • Dam Pressure http://www.coffsharbour.nsw.gov.au/www/html/508-karangi-dam.asp
    • Benefits
      • Hydro power plants located at the lowest point of the dam wall
      • Produce electricity without using non-renewable resources (7.)
      • Low amount of environmental harm compared to other types of power plants
      • Provide drinking water
      • Store water for dry periods (7.)
    • Nile River: Aswan High Dam
      • Location:
    • The Aswan High Dam
      • http://en.wikipedia.org/wiki/File:Aswan_dam.jpg
    • Aswan High Dam: Problem and Impacts
      • Cause of problem: poor drainage => saturation and increase in salinity (5.)
      • Impact:
        • Economic: more than 1⁄ 2 of Egypt's farmland soil has worsened=>less crops produced (trade also affected)
        • Human health: number of individuals affected by the parasitic disease schistosomiasis (associated with stagnant water) has increased
        • Ecological: soil of farmlands becomes useless; salinity and poor drainage destroy soil (5.)
    • Aswan High Dam: Problem Solution
      • Possible solutions:
        • Installation of wells to lower water table
        • Replacement of foundation stones with other materials
        • Injection of a chemical sealant between the structures and the soil in order to create a barrier (1.)
      • This may be very expensive to accomplish
      • In addition, the construction of each of the above may cause harm to the surroundings (1.)
    • Sacramento Delta: Shasta Dam
      • Location:
    • The Shasta Dam
      • http://cee.engr.ucdavis.edu/faculty/lund/dams/Shasta/ShastaDam.html
    • The Shasta Dam: Major Problem
      • Raising of dam => flooding of nearby canyons => endangering surroundings (wildlife, forests, etc.) = interference with other ecosystems (even destruction of ecosystems) (2.)
      • Money costs may also result (6.)
    • Works Cited
      • 1.&quot;Aswan High Dam.&quot; People and Place. 13 Apr. 2007. 8 Jun. 2010. <http://www.outreachworld.org/Files/u_texas/aswan_high_dam.pdf>.
      • 2.Dawson, Elizabeth . &quot;Shasta Dam.&quot; Shasta Dam. 5 Dec. 1994. 8 Jun. 2010. <http://cee.engr.ucdavis.edu/faculty/lund/dams/Shasta/ShastaDam.html#Photographs>.
      • 3.&quot;Do Dams Cause Earth Quakes ? &quot;. Yahoo!Answers. 15 Jun. 2010. <http://in.answers.yahoo.com/question/index?qid=20080830010806AALXvOL>.
      • 4.McCully, Patrick. &quot;Greenhouse Gas Emissions from Dams FAQ&quot;. International Rivers. 06/15/2010 <http://www.internationalrivers.org/node/1398>.
      • 5.Rosenberg, Matt . &quot;Nile River: Aswan High Dam Controls The Nile River.&quot; About.com: Geography. 27 Jul. 2009. 8 Jun. 2010. <http://geography.about.com/od/ specificplacesofinterest/a/nile.htm>.
      • 6.&quot;Shasta Dam.&quot; Wikipedia: The Free Encyclopedia . 29 May. 2010. 15 Jun. 2010. <http://en.wikipedia.org/wiki/Shasta_Dam#Arguments_against>.
      • 7.&quot;SwissDams&quot;. International Commision on Large Dams. June 15, 2010. <http://www.swissdams.ch/Committee/Dossiers/BandC/Benefits_of_and_Concerns_about_Dams.pdf>.