|Akasheh, O - UNIV. OF TEXAS - AUSTIN|
|Scanlon, Bridget - UNIV. OF TEXAS - AUSTIN|
Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: July 3, 2008
Publication Date: October 5, 2008
Citation: Akasheh, O., Gowda, P., Scanlon, B.R., Howell, T.A., French, A.N. 2008. Monitoring ET over Texas High Plains using two source model and high resolution aster data [abstract]. 2008 Joint Meeting of American Society of Agronomy, Soil Science Society of America, and Crop Science Society of America, October 5-9, 2008, Houston, Texas. Paper No. 74-8. 2008 CDROM. Technical Abstract: In agriculture, evapotranspiration (ET) is a major consumptive use of irrigation water and precipitation. In this study, we applied the Two-Source Model (TSM) to estimate daily ET from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data for the highly advective Texas High Plains where more than 90 percent of the groundwater withdrawals are used for irrigation. Two ASTER images, acquired as part of the Bushland Evapotranspiration and Agricultural Remote Sensing Experiment - 2007 (BEAREX07) on July 11 and September 13, covering a portion of the Texas High Plains including the USDA-ARS Conservation and Production Research Laboratory (CPRL) at Bushland, Texas, were used. Atmospheric correction of the ASTER images was done using the MODTRAN, an atmospheric radiative transfer model. Performance of the TSM was evaluated by comparing estimated daily ET with measured data on four large lysimeters in Bushland [35 deg 11 min N, 102 deg 06 min W; 1,170 m elevation MSL] managed by the CPRL. Model performance results indicate that the TSM is suitable for estimating ET over Texas High Plains. However, more evaluation is needed for different agroclimatological conditions in the region.