jessie sagona sarp presentation
TRANSCRIPT
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Estimation ofEvapotranspiration with
Jessie Sagona
Student Airborne Research
Program
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Outline
Introduction
What is ET, why is it important?
Method
How can we estimate ET? Whatassumptions go into it?
Results
Conclusions
Acknowledgements
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How does METRIC calculate
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Solar radiation
Inputs:
Day of year
Time of day
Latitude
Elevation
Transmissivity of atmosphere
Albedo
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Longwave radiation
Inputs:
Surface temperature (from Cassie andJames)
Emissivity (both atmosphere and crop)
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Sensible heat flux
Difficult to measure directly
In METRIC, calculated via iterationswith aerodynamic resistance.
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Latent heat flux
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Inputs to Code
Once code was ready, usedtemperature and SAVI estimates asinputs, with other variables set the
same for every pixel (i.e. latitude).
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Two types of runs
LAI from MASTER bandmath
LAI from Emilys analysis
Temperature always from MASTER data
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~3.3
~0.78
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Almond irrigation
Drip irrigation
Fanjet irrigation
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Almond ET using Emilys LAI
For 2nd field: average LAI = 2.65
For 3rd field: average LAI = 2.28
Resulting ET values: Field 2: 1.064 mm/hr
Field 3: 1.058 mm/hr
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1.110 mm/hr
1.074
1.081
1.053
1.078
1.064
1.056
ET using LAI from
ET using LAI fromground
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ET from CIMIS Penman-
The Penman-Monteith equationcalculates ET based onmeteorological parameters.
The CIMIS version has a slightlydifferent treatment of wind speedcompared to the classic version.
For almond orchard at time of flight:
ET = 1.38 mm hr
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Cotton Fields
~2.56
~3.15
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1.059
0.929
1.024
1.027
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Cotton ET using Emilys LAI
Overall LAI for cotton was 1.49.
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ET from CIMIS Penman-
For cotton fields at time of flight:
ET = 0.572 mm/hr
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Conclusions - Almonds
The fanjet irrigation is more effectivethan drip irrigation, leading to higherET. METRIC underestimates ET
compared to the CIMIS PM equation.
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Conclusions - Cotton
METRIC strongly overestimates ETcompared to the CIMIS PM equation.
However, ground LAI measurements
and LAI from SAVI are very similar,resulting in similar ET values.
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Acknowledgements
Cassie, James, and Emily for directuse of data
Shawn for guiding our project
All of the SARP staff for this greatprogram!
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Questions?