Mapping Evapotranspiration Tony Morse October 9, 2009
What is Evapotranspiration? (Call it “ET”) Water that goes from liquid to vapor Water evaporated – usually from soil Water transpired by growing vegetation
Energy Balance for ET Basic Principle : Evaporation consumes Energy R n H ET ET = R - G - H n G ET is calculated as a “residual” of the energy balance
Why is Mapping ET Important? There is not enough water Increasing stress on water supplies Increasing population Changing climate We can’t manage what we can’t measure How much water is used Where it is used
Competition for Water
How to Map ET Landsat Data and the METRIC model
Landsat Data
Idaho Applications of ET Water Planning Aquifer Depletion Hydrologic Modeling Endangered Species Legal Finding-of-Fact Agricultural Water Use Water Rights Buy-Back Water Rights Compliance Water Rights Administration In-Season Demand for Water Tribal Water Rights Negotiations
Broader Applications Multi-scale ET Climate change Global carbon issues
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