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EGSC WaterSMART -irrigation water use research

EGSC WaterSMART -irrigation water use research. Input for the ACF WaterSMART Stakeholders meeting. John W. Jones USGS Eastern Geographic Science Center March 08, 2012. How much (which) land is irrigated?. Create maps of water evaporation from satellite imagery.

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EGSC WaterSMART -irrigation water use research

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  1. EGSC WaterSMART-irrigation water use research Input for the ACF WaterSMART Stakeholders meeting John W. Jones USGS Eastern Geographic Science Center March 08, 2012

  2. 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.

  3. 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.

  4. Evaporation example from AR / MS pilots • Mississippi County AR Goal: apportion ground measured annual total irrigation to growing season dates. • Yazoo delta MS Goal: Extrapolate limited monitoring data to entire region and longer time frames.

  5. Remote sensing approach uses satellite based surface temperature • Surface temperature on June 26, 2009. • Mississippi County, Arkansas outline shown in black.

  6. Remote sensing approach uses satellite based estimates of vegetation amount • Vegetation Index (NDVI) for June 26, 2009. • Mississippi County, Arkansas outline shown in black.

  7. Vegetation amount (NDVI) vs. temperature of the surface (Ts) – temperature of the air (Ta) • 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)

  8. June 21 2009 evapotranspiration • Mississippi County, Arkansas boundary shown in black.

  9. 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.

  10. Progress to-date • Image database (to-date):

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