Bishop p. 111 – 116

  • Drought is an extended period of dry weather leading to conditions of extreme dryness.
  • It is a characteristic of moisture deficiency, when lower than normal rainfal occurs for an extended period of time.
  • Because the ecosystem and/or human system is adapted to a certain amount of rainfall, the deficit will have a negative impact.
  • Impact will vary depending on evapotranspiration,  runoff and infiltration.
  • “For a drought to develop the lack of rainfall must be enough to cause the soil and groundwater stores to decline” (Bishop, 111)
  • There is a difference between drought, aridity and desertification (see Bishop table 6.5, p. 112)
  • Mainly in semi-arid areas
  • Large human influence

Pictures of the ongoing California drought

Thake your notes on this shared google doc: IB12 -Hazards -Droughts

Define:  drought

Define flash floods:


1. Use this link to define, in your own words, the following terms:

  1. Meteorological drought
  2. Hydrological drought
  3. Agricultural drought
  4. Socio-economic drought

2. Find a map of the global distribution of droughts and their severity, and write a short description of the spacial distribution of droughts.

3. Explain the difference with your answer in Q2 and the global distribution of drought mortality

7293-23FBDFFBB3D9F5328525731600496F62-ciesin_DR_wrl050529

 

3. Explain the four physical reasons why droughts are more prominent in certain areas:

  1. Continentality
  2. Cold ocean currents
  3. ITCZ
  4. Rain-shadow effect

4. Describe:

  • the main features  of the Palmer Drought Indices and evaluate its efficiency in comparing droughts
  • The method of measuring rainfall

5 describe the following characteristics of droughts:

  1. Frequency
  2. Duration
  3. Speed of onset
  4. Areal extent
  5. Spatial dispersion
  6. Regularity

6. Case study: California / American South West  drought of 2012

Details:

  • Santa Barabra County, California
  • Santa Ynez River
  • Lake Cachuma
  • Gibraltar Reservoir
  • Jameson Lake

hydroarvmap(091515)

 

 

 

 

 

 

 

 

 

 

 

 

CO-River-Basin

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Complete the case study questions on the doc:

Each of of you will read one article from MSNBC’s California drought special report or http://ca.gov/drought,  ormy diigo and briefly explain it to the rest of the class. 

Make sure these areas are covered:

  • Will El Nino end the drought?
  • Causes
  • Response
  • Prevention / management strategy (reduce use by 25%)
  • Land use planning
  • Economic impact
  • Measuring the drought
  • Social impacts
  • Environmental impacts
  • prediction