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6 Introduction To Drought
6 Introduction To Drought
6 Introduction To Drought
6 Introduction To Drought
6 Introduction To Drought
6 Introduction To Drought
6 Introduction To Drought
6 Introduction To Drought
6 Introduction To Drought
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6 Introduction To Drought

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  • 1.  
  • 2. Drought What is drought? What are the causes and consequences of drought? How do humans respond to the drought crises?
  • 3. Drought Definitions
    • Drought is a continuous period of dry weather.
    • Definitions of drought vary between countries; in the British Isles definitions can be very precise – 15 consecutive days each with less that 0.25mm of rainfall. In Africa drought is defined as a period where evapotranspiration exceeds precipitation and soil moisture is depleted.
    • Distinctions can be made between short term dry seasons (to which human and natural systems can adapt) and long-term droughts that can affect areas for several years with disastrous consequences.
  • 4. Seasonal Drought The Hadley cell dominates precipitation patterns within the tropics leading to seasonal drought (wet and dry seasons) in the savannah regions as the Inter-Tropical Convergence Zone (ITCZ) migrates north and south.
  • 5. Nomads of the Savanna Turkana, an indigenous people who migrate with the seasonal rains. They are nomadic pastoralists.
  • 6. Vegetation of the Savanna Boabab tree. Thick truck store water for use during the long dry season. The fire proof bark also provides protection during this time.
  • 7. Long Term Drought
    • Example, the Horn of Africa.
    • Ethiopia 1974, 1984 (which triggered the infamous Live Aid concert)
    • Huge areas covering the Horn in early 2006 (11 million people left needing food aid after the rains fail once again)
    Why does it happen?
  • 8. What are the consequences of drought
  • 9. How can drought be managed?

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