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Natural Disaster how can impact on ecosystem S.mohanaraj

this ppt tell about what is natural disaster and how can impact on ecosystem

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Natural Disaster how can impact on ecosystem S.mohanaraj

  1. 1. Natural Disaster How Can Impact on Ecosystem S.Mohanaraj Special in Geography Department of Geography SOUTH EASTERN UNIVERSITY OF SRI LANKA
  2. 2. CONTENT OF PRESENTATION Definition of Natural Disaster Type of Natural Disaster Short Definition of every types of Natural Disaster How impact in ecosystem S.Mohanaraj SEUSL 2
  3. 3. Definition of Natural Disaster “a serious disruption of the functioning of society, causing widespread human, material or environmental losses which exceed the capacity of the affected society to cope using only its own resources” (United Nations) “an event is classified as a disaster if at least 10 people are killed and/or 100 or more are affected and/or an appeal for international assistance is made or a state of emergency declared” (CRED, 2000) 3 S.Mohanaraj SEUSL
  4. 4. Type of Natural Disaster  Landslide  Drought  Floods  Tsunami  Tropical Cyclones, Typhoons and Hurricanes  Lightning  Fire  Tornados  Volcanoes  Blizzards  Earthquake  Heat S.Mohanaraj SEUSL 4
  5. 5. Landslide  A landslide is a geological phenomenon which includes a wide range of ground movement, such as rock falls, deep failure of slopes, and shallow debris flow.  Although gravity acting on an over steepened slope is the primary reason for a landslide, there are other contributing factors.  An avalanche is caused when a build up of snow is released down a slope, and is one of the major dangers faced in the mountains in winter 5 S.Mohanaraj SEUSL
  6. 6. Drought A long period of abnormally low rainfall, especially one that adversely affects growing or living conditions. S.Mohanaraj SEUSL 6
  7. 7. Flood A temporary rise of the water level, as in a river or lake or along a seacoast, resulting in its spilling over and out of its natural or artificial confines onto land that is normally dry. Floods are usually caused by excessive runoff from precipitation or snowmelt, or by coastal storm surges or other tidal phenomena. 7 S.Mohanaraj SEUSL
  8. 8. Tsunami An unusually large sea wave produced by a seaquake or undersea volcanic eruption. 8 S.Mohanaraj SEUSL
  9. 9. Tropical Cyclones, Typhoons and Hurricanes  These are regional names for the same phenomenon.  Tropical Cyclones – Depressions in the tropics which develop into storms in the south-west Indian Ocean, the Bay of Bengal, and the Arabian Sea, parts of the south Pacific and along the northern coasts of Australia.  Typhoons - north-west Pacific  Hurricanes - in the Caribbean, south-east United States and Central America. 9 S.Mohanaraj SEUSL
  10. 10. Lightning A brilliant electric spark discharge in the atmosphere, occurring within a thundercloud, between clouds, or between a cloud and the ground 10 S.Mohanaraj SEUSL
  11. 11. Fire  An uncontrolled fire occurring in vegetation more than 6 feet (1.8 m) in height.  These fires often reach the proportions of a major conflagration and are sometimes begun by combustion and heat from surface and ground fires. 11 S.Mohanaraj SEUSL
  12. 12. Tornados A violently rotating column of air extending from a cumulonimbus cloud to the Earth, ranging in width from a few meters to more than a kilometer and whirling at speeds between 40 and 316 mi per hour. 12 S.Mohanaraj SEUSL
  13. 13. Volcanoes a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals 13 S.Mohanaraj SEUSL
  14. 14. Blizzards A violent snowstorm with winds blowing at a minimum speed of 35 miles per hour and visibility of less than one-quarter mile for three hours 14 S.Mohanaraj SEUSL
  15. 15. Earthquake A sudden movement of the earth's crust caused by the release of stress collected along faults or by volcanic activity 15 S.Mohanaraj SEUSL
  16. 16. Heat  An air mass of high temperature covering an extended area and moving relatively slowly  an air mass of high temperature covering an extended area and  moving A period of relatively abnormally hot and slowly usually humid  a period of abnormally hot and usually humid 16 S.Mohanaraj SEUSL
  17. 17. How Earthquakes Impact the Ecosystem  Destroyed buildings  Property damage  Mud slides  Fires  Floods  Tsunamis  Loss of power 17 S.Mohanaraj SEUSL
  18. 18. How Drought Impacts the Ecosystem  Young trees die  Dried up lakes and other water sources  Loss of livestock and crops  Losses of fish and wildlife habitat  Lack of food and drinking water for wild animals  Increase in disease in wild animals, because of reduced food and water supplies  Migration of wild animals,  Lower water levels in reservoirs, lakes, and ponds  Loss of wetlands  More fires, reduced soil quality 18 S.Mohanaraj SEUSL
  19. 19. How Tropical Cyclones, Typhoons and Hurricanes Impact the Ecosystem  Erosion  Houses, buildings, and other structures destroyed  Heavy flooding of inland areas  Tornadoes  Loss of power  Disconnect water supply 19 S.Mohanaraj SEUSL
  20. 20. How Fire Impacts the Ecosystem  Houses, buildings, and other structures destroyed  Loss of habitat S.Mohanaraj SEUSL 20
  21. 21. How Tsunamis Impact the Ecosystem  Houses, buildings, and other structures destroyed  Loss of power  Erosion  Fresh water contaminated 21 S.Mohanaraj SEUSL
  22. 22. How Volcanes Impact the Ecosystem  Houses, buildings, and other structures destroyed  Fires  Toxic gases released into the atmosphere  Carbon dioxide emitted from volcanoes adds to the natural greenhouse effect.  Loss of habitat 22 S.Mohanaraj SEUSL
  23. 23. How Blizzards Impact the Ecosystem  Flooding when snows melt  Trees fall  Power outages  Hypothermia 23 S.Mohanaraj SEUSL
  24. 24. How Flooding Impacts the Ecosystem  Disease  Loss of habitat  Houses, buildings, and other structures destroyed  Household wastes get into the water system  Power outages 24 S.Mohanaraj SEUSL
  25. 25. How Tornadoes Impacts the Ecosystem  Tornadoes could hit hazardous or toxic materials which could carried by a thunderstorm and then transported along ways down stream.  Could transport certain types of small animals and plants across the land  Destroys topsoil and crops 25 S.Mohanaraj SEUSL
  26. 26. How Lightning Impacts the Ecosystem  Fire  Loss of power 26 S.Mohanaraj SEUSL
  27. 27. THANK YOU VERY MUCH 27 S.Mohanaraj SEUSL
  28. 28. References 28 S.Mohanaraj SEUSL