Geological Hazards and Their Impact_McGeary_Date_043010

Geological Hazards and Their Impact_McGeary_Date_043010 -...

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Mitigating Flood Hazards Ways to mitigate flood hazards: 1) reduce volume of water - build dams expensive damages ecology don’t work that well for flood control last big dam Teton o 1975 o failed in 1976 - watershed management planting trees retention (detention?) basins o looks like a pond surrounded by a fence 2) engineering - make channel bigger - build levees raises water levels avulsion stream cuts a new channel during a flood, water “jumps” the banks 3) flood insurance 4) not build or leave floodplain Climate Change and Weather Related to Natural Hazards Weather- conditions of the atmosphere at a particular place and time
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Temperature Pressure Precipitation Wind Clouds Etc. Climate – weather conditions averaged over a long period of time Use temperature as a proxy Earth’s Energy Budget – if the Earth absorbs more energy then it emits into space, the temperature increases. If the Earth absorbs less, the temperature decreases.
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Unformatted text preview: • Solar radiation – energy coming in o Have to subtract from the solar radiation all the energy that is reflected from the Earth and clouds o Albedo – percentage of energy that is reflected o Need to also add in greenhouse gases If there was no atmosphere or greenhouse gases the Earth’s temperature would be -18 degrees C • Average global temperature is 15 degrees C (60 degrees F) • Greenhouse effect- is about 33 degrees C • If 5 – 10 degrees C colder than today, 30% of land would be ice covered ← ← What can cause global climate change? (change in temperature) • Change in output of the sun • Change in the amount of solar radiation that reaches the Earth o Distance of the Earth to the sun varies (because of elliptical orbit) • Change in albedo (reflectivity) o Ice or clouds • Change the amount of greenhouse gases (GHG) in the atmosphere....
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This note was uploaded on 08/30/2010 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.

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Geological Hazards and Their Impact_McGeary_Date_043010 -...

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