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What is drought? <ul><li>There are many definitions, but usually it is a period of time where there is much less than aver...
What factors affect drought? <ul><li>Wealth </li></ul><ul><li>Population </li></ul><ul><li>Temperature </li></ul><ul><li>R...
How does drought affect MEDC’s? <ul><li>Fall in river levels </li></ul><ul><li>Reduced water supply </li></ul><ul><li>Hose...
Can drought be controlled? <ul><li>Reduce the causes of drought </li></ul><ul><li>Cope with drought </li></ul><ul><ul><li>...
English drought <ul><li>http://search.bbc.co.uk/cgi-bin/search/results.pl?tab=av&q=uk%20drought&recipe=all&scope=all&editi...
Drought in the Sahel- LEDC case study <ul><li>The Sahel is the narrow belt of semi-arid land on the edge of the Sahara des...
The causes of the drought are quite unique <ul><li>In rain years, the Sahel receives just enough to prevent the droughts f...
The causes of the drought are quite unique <ul><li>But in drought years, the ITCZ doesn’t move as north as it should, due ...
Human causes of drought in the Sahel <ul><li>Desertification-  is the spread of desert-like conditions in arid or semi ari...
What are the effects of drought in the sahel?? <ul><li>List as many as possible </li></ul>
Living with drought in the Sahel and preventing desertification <ul><li>Build dams to improve water storage for dry period...
How can we reduce the effects of drought in MEDC’s and LEDC’s? <ul><li>1) Reduce the costs of drought.  </li></ul><ul><li>...
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Drought Ap

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Drought Ap

  1. 1. What is drought? <ul><li>There are many definitions, but usually it is a period of time where there is much less than average rainfall. </li></ul><ul><li>What do you think factors affect drought in a country? Can you list some ideas? </li></ul>
  2. 2. What factors affect drought? <ul><li>Wealth </li></ul><ul><li>Population </li></ul><ul><li>Temperature </li></ul><ul><li>Rainfall </li></ul><ul><li>Run-off rates </li></ul><ul><li>Land use </li></ul><ul><li>… these are found on p96 PTT </li></ul>
  3. 3. How does drought affect MEDC’s? <ul><li>Fall in river levels </li></ul><ul><li>Reduced water supply </li></ul><ul><li>Hosepipe bans </li></ul><ul><li>Damage housing foundations </li></ul><ul><li>Fire risk </li></ul><ul><li>Crop failure </li></ul><ul><li>Reduced water for industries (needed for cooling in processing) </li></ul>
  4. 4. Can drought be controlled? <ul><li>Reduce the causes of drought </li></ul><ul><li>Cope with drought </li></ul><ul><ul><li>Improve prediction, e.g. satellite warning. </li></ul></ul><ul><ul><li>Provide food aid sooner, especially to small scale farmers. </li></ul></ul><ul><ul><li>Build large reservoirs and deeper wells. </li></ul></ul><ul><li>Live with drought </li></ul><ul><ul><li>Improve farming methods, e.g. AGRHYMET </li></ul></ul><ul><ul><li>Stop desertification. </li></ul></ul>
  5. 5. English drought <ul><li>http://search.bbc.co.uk/cgi-bin/search/results.pl?tab=av&q=uk%20drought&recipe=all&scope=all&edition= </li></ul>
  6. 6. Drought in the Sahel- LEDC case study <ul><li>The Sahel is the narrow belt of semi-arid land on the edge of the Sahara desert in Africa. </li></ul><ul><li>Sahel literally means ‘edge of the desert’. </li></ul><ul><li>It is famous for the severe droughts it suffers. </li></ul>
  7. 7. The causes of the drought are quite unique <ul><li>In rain years, the Sahel receives just enough to prevent the droughts from causing a disaster… </li></ul>Position of the ITCZ on 21 June Strong south-westerly rain-bearing winds
  8. 8. The causes of the drought are quite unique <ul><li>But in drought years, the ITCZ doesn’t move as north as it should, due to global climatic patterns and this prevents the south-westerly winds bringing the usual rain. </li></ul>Position of the ITCZ on 21 June Weak south-westerly rain-bearing winds
  9. 9. Human causes of drought in the Sahel <ul><li>Desertification- is the spread of desert-like conditions in arid or semi arid areas dues to human influence or climate change. It is very hard to get the land back to its original condition. </li></ul><ul><li>http://www.green.tv/unep_global_desertification_outlook </li></ul><ul><li>Overcultivation- when arable agriculture has taken the nutrients out of the soil and it is over-used. The soil then becomes useless, and dry and is easily eroded by wind or water </li></ul><ul><li>Overgrazing- when there are too many cattle for the land to support them. They eat all of the vegetation that protect the soil and so erosion occurs. </li></ul><ul><li>Annotate your spiral diagrams on p25 to show these causes. </li></ul>
  10. 10. What are the effects of drought in the sahel?? <ul><li>List as many as possible </li></ul>
  11. 11. Living with drought in the Sahel and preventing desertification <ul><li>Build dams to improve water storage for dry periods. </li></ul><ul><li>Introduce new drought-resistant crops as in Nigeria </li></ul><ul><li>Build earth traps to prevent soil from being washed away </li></ul><ul><li>Start afforestation schemes (will increase interception and reduce overland flow, and prevent erosion </li></ul><ul><li>The best solutions are small scale, low cost of appropriate technology. </li></ul>
  12. 12. How can we reduce the effects of drought in MEDC’s and LEDC’s? <ul><li>1) Reduce the costs of drought. </li></ul><ul><li>2) Cope with drought. </li></ul><ul><li>3) Live with drought. </li></ul>

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