2005 2013

NASA Earth Science Applications

Partners:

Landsat image comparison of the change in coverage of late-summerfloating aquatic vegetation biomass between 2005 and 2013 near theDelta-Mendota Canal, showing the increase in Water Hyacinthcoverage in 30-meter resolution (as blue shaded) pixels

Landsat Mapping of Water Hyacinth Peak Cover in 2011 (RED) and in 2015 (BLUE) on Central Delta Waterways

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NASA Airborne Mapping of Water Hyacinth (blue) and Water Primose (red) on the Delta Waterways – Results from June 2013 Flights

Sherman Lake and Big Break Franks Tract

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Delta Pesticide and Nutrient Loading Estimations Using Soil and Water Assessment Tool (SWAT)

for the Sacramento and San Joaquin Rivers Watersheds

Minghua Zhang, Mohammad Abdolahi, Huajin ChenDept. of Land, Air and Water Resources, UC Davis

Christopher Potter and David BubenheimNASA Ames Research Center

USDA-ARS Area-Wide Pest Management Project

USDA SWAT Model -- HRU Delineation for the Sacramento-San Joaquin Delta

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SWAT for the Sacramento and San Joaquin River Watersheds

• Total area: 15,000 km2

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• Outlet : Sacramento River at Freeport

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The implementation of the flood weir modification allowed for much-improved model simulations. With the addition of the flood stage discharges, the uncalibrated monthly NS coefficient for streamflow

improved from -1.2 to 0.7, for a better representation of the managed hydrologic flows in the watershed.

Sacramento River Monthly Stream Flow SWAT Validation: Before and after flood weir modification

San Joaquin River Monthly Stream Flow SWAT Validation

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SWAT calibration and validation status for selected pesticides

Chemical Calibration period Validation period Explanation

1 Diuron 1997-1998 (2 years) 2012-2013 (2 years)

2 Carbaryl - - Insufficient observed data

3 Permethrin - - Insufficient observed data

4 Hexazine 2008-2011 2012-2013 Separate calibration

5 Metolachlor 1997-2006 2007-2013

6 Thiobencrab 1997-2005 2010-2012

7 Simazine 1997-2006 2007-2012

8 Propanil Its half life is too low

9 Molinate - - Low application after 2009

10 Fipronil - - Insufficient observed data

11 Desulfinyl fipronil - - Insufficient observed data

12 Clomazone - - Insufficient observed data

13 Imidacloprid - - Not in the list of detected material

14 Azoxystrobin - - Not in the list of detected material

15 3,4-dichloroaniline - - Insufficient observed data