EAS328_Lecture6_Part2_drought_heatwaves_wildfires(1)

EAS328_Lecture6_Part2_drought_heatwaves_wildfires(1) - EAS...

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EAS 328: Natural Environmental Hazards Lecture #6: Friday, March 4, 2016: PART 2 Plan for this lecture: 1. Examine Drought and Heat Waves 2. Discuss Urban Heat Island 3. Discuss Wild Fires Some slides are adapted from: Keller, DeVecchio; Natural Hazards ; by Tim Frazier
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Drought Extended period of low precipitation Produces a shortage of water for people, animals and plants Regional food shortages Affects more people than any other natural hazard Causes losses of 46 to $8 billion each year Causes water and power shortages and agricultural problems
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North American Drought Condi3ons and Effects
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Heat Waves Prolonged periods of extreme heat that are both longer and hotter than normal Associated with long areas of high pressure, called ridges Wet conditions to the west of ridge Dry conditions to the east of ridge Accompany either severe humidity or extreme dryness Important to monitor the heat index Body’s perception of air temperature
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hQp://www4.ncsu.edu/~nwsfo/storage/cases/20100725/ Heat Waves
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What causes the most health problems with heat waves in urban areas? -­‐ Sustained High Temperatures during the day -­‐ Not enough cooling at night -­‐ Stagnant air plus local polluZon decreases air quality ScienZfic definiZon of a heat wave: varies by city and country. hQps:// protecZng-­‐people-­‐sweltering-­‐city-­‐summers
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Heat Index Chart HEAT INDEX Why is the heat index related to both T and RH? humans cool through evaporaZon of perspiraZon (again related to phase changes!)
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Urban Heat Island Urban Heat Island Effect Causes urban area to be 12°C (22°F) warmer
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Research on the UHI at CCNY 1. Set thermometers throughout the city for a 3-­‐ month period.
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