CE361 - Lecture 10

CE361 - Lecture 10 - 2/16/2009 Dr. Thorsten Wagener Penn...

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2/16/2009 1 Dr. Thorsten Wagener Penn State University Precipitation - Evaporation Water Resources 1 Engineering -Lecture±10 http://geography.uoregon.edu/envchange/clim_animations/gifs/pminuse_web.gif Hydrologic Processes 2
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2/16/2009 2 Content 1. Earth’s Energy Balance 2. Evapotranspiration 1. Water Balance Approach 3. Measuring Evaporation 4. Evaporation 1. Evaporation Pan 3 2. Energy Balance Method 3. Aerodynamic Method 4. Combined Aerodynamic and 5. Energy Balance Method QUICK REVIEW 4
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2/16/2009 3 Evapotranspiration ( et ) thus requires Solar Radiation Local Precipitation Solar Energy Available Water 5 Because both solar energy and available water are necessary to cause evaporation and transpiration, energy will limit the rate of et at some times, and water availability will limit the rate at other times. Evaporation Figure 7.3.1 (p. 228) Evaporation (magnified one billion times) (from Feynman et al. (1963)). Air (nitrogen, oxygen, water vapor, carbon dioxide, argon, …) Water 6 The supply of energy to provide latent heat of vaporization and the ability to transport water vapor away from the evaporative surface are the two major factors that influence evaporation.
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2/16/2009 4 http://rsd.gsfc.nasa.gov/rsd/images/Linda/linda_6_lg.jpg HURRICANES 7 http://en.wikipedia.org/wiki/Hurricanes 8 Map of the cumulative tracks of all tropical cyclones during the 1985–2005 time period. The Pacific Ocean west of the
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CE361 - Lecture 10 - 2/16/2009 Dr. Thorsten Wagener Penn...

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