EGSC WaterSMART -irrigation water use research
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Transcript of EGSC WaterSMART -irrigation water use research
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EGSC WaterSMART-irrigation water use research
John W. JonesUSGS Eastern Geographic Science Center
March 08, 2012
Input for the ACF WaterSMART Stakeholders meeting
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How much (which) land is irrigated?
Create maps of water evaporation from satellite imagery.
Irrigated land = high demand and high evaporation and cropland.
Test map accuracy through comparison with GaMP data and irrigation demand analysis.
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How much water is evaporating in irrigated areas?
Create maps of water evaporation from satellite imagery.
Interpolate instantaneous evaporation between image dates.
Sum evaporation by location. Compare against GaMP, ground-based
evaporation measurements and hydrologic model estimates.
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Mississippi County AR Goal: apportion ground measured annual total irrigation to growing season dates.
Evaporation example from AR / MS pilots
Yazoo delta MS Goal: Extrapolate limited monitoring data to entire region and longer time frames.
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Surface temperature on June 26, 2009.
Mississippi County, Arkansas outline shown in black.
Remote sensing approach uses satellite based surface temperature
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Vegetation Index (NDVI) for June 26, 2009.
Mississippi County, Arkansas outline shown in black.
Remote sensing approach uses satellite based estimates of vegetation amount
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A – HIGH Evapotranspiration (little difference between surface and air temperature)B – low Evapotranspiration (large temperature difference over dense vegetation)C – HIGH soil Evaporation (small temperature difference over bare ground)D – low soil Evaporation (large temperature difference over bare ground)
Vegetation amount (NDVI) vs. temperature of the surface (Ts) – temperature of the air (Ta)
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Mississippi County, Arkansas boundary shown in black.
June 21 2009 evapotranspiration
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Progress to-date
Specific GA study area selected (Spring and Ichawaynochaway Creeks)
Landsat imagery selected, acquired and calibrated to at-surface reflectance.
Two major components of analysis have been coded for batch processing.
Challenge: Discovered cloud/cloud shadow screening “glitch” is being corrected.
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Progress to-date
Image database (to-date):
Year Landsat 5 Landsat 7 Total
2007 9 7 16
2008 4 9 13
2009 11 8 19
2010 14 15 29
Total 38 39 77