Irrigation and Drainage

Oral

394516 - LANDSAT and SWAT Evapotranspiration Inter-comparison between Dry fields and Irrigated fields

Tuesday, June 5
4:00 PM - 5:30 PM
Location: Skyway Room
Co-Authors: Bernard Engel, Department of Agricultural & Biological Engineering 225 South University Street West Lafayette, IN 47907-2093 – Purdue University; Vincent Bralts, 225 South University Street West Lafayette, IN 47907-2093 – Purdue University; Prasanna Gowda, 7207 West Cheyenne Street El Reno OK 73036 – USDA-ARS Grazinglands Research Laboratory; Venkatesh Merwade, Hampton Hall of Civil Engineering 550 Stadium Mall Drive Purdue University West Lafayette, IN 47907-2051 – Purdue University; Dennis Flanagan, 175 University St, West Lafayette, IN 47907 – Purdue University; Sherif Radwan, Kilo 4.5, Ring Road, Ismailia, Egypt. 41522 – Suez Canal University; Mohamed Rashad, Kilo 4.5 Ring Road, Ismailia, Egypt 41522 – Suez Canal University

Hydrologic modeling and use of remotely sensed evapotranspiration (ET) and Leaf Area Index (LAI) estimation methods play a major role in water cycle budgeting. This is particularly true in irrigation scheduling and management when there is an absence of accurate ET measurements. The uncertainties in each estimation method between irrigated and non-irrigated fields is a major concern due to modeling uncertainties, and estimation errors. The main objective of this research was to inspect the variability in ET and LAI estimation at a field scale using: a) Landsat satellite-based thermal data with 30 m spatial resolutions, and b) Soil Water Assessment Tool (SWAT). Data from 17 commercial agricultural fields in Indiana were selected for this purpose under two conditions for SWAT and Landsat: a) dry fields, and b) irrigated fields.

This study was conducted in the St. Joseph River Basin, specifically the ALG site in Cedar Creek Watershed, near Waterloo, IN, USA. The total area of the ALG site is about 20 km2, with corn and soybean the predominant row crops grown primarily under dry land conditions. The Bushland Evapotranspiration and Agricultural Remote Sensing System (BEARS) was used to derive ET using Landsat 5 data for the growing season (April 1st to October 31st) for 4 years from 2008 to 2011. The preliminary results indicated the ET and LAI values for the irrigated fields are higher than non-irrigated fields, and there are reasonable estimates for the coefficient of determination, RMSE, slope and intercept of the correlation between irrigated vs. non-irrigated within each estimation method. However, the same coefficient estimates are non-reasonable for the Landsat vs. SWAT in irrigated and non-irrigated fields. Thus, a modification of the ET and LAI for the hydrologic modeling is essential based on RS estimation of ET, to improve overall hydrologic modeling accuracy.

Ahmed Abdelkareem Hashem

PhD Candidate
Purdue University, Agr. & Bio. Eng.

Presentation(s):

Send Email for Ahmed Hashem


Assets

394516 - LANDSAT and SWAT Evapotranspiration Inter-comparison between Dry fields and Irrigated fields



Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for LANDSAT and SWAT Evapotranspiration Inter-comparison between Dry fields and Irrigated fields