Hourly Alfalfa Evapotranspiration Estimation Using Variable Bulk Surface Resistance
Publication: Journal of Irrigation and Drainage Engineering
Volume 145, Issue 10
Abstract
Alfalfa hourly bulk surface resistance () has been modeled as a function of crop biophysical characteristics. The new modeled allows the calculation of hourly alfalfa evapotranspiration (ET) using the Penman-Monteith (P-M) equation. In addition, another equation from the literature was also evaluated. The experiment took place during the 2009 and 2010 alfalfa growth seasons near Rocky Ford, Colorado. The results indicated that ET obtained from parameterized with leaf area index (LAI) or crop height () was more accurate than ET calculated with conventionally obtained when evaluated with lysimetric data. In addition, for less than 25 cm, ET was remarkably better estimated with the new model than with conventional . However, for greater than 25 cm, the proposed was slightly better than conventional . The value of conventional was underestimated when was less than 25 cm. These underestimated values resulted in higher hourly alfalfa ET rates (20% in 2009 and 41.5% in 2010). By contrast, the new approach underestimated ET by 7.5% for less than 25 cm in 2009, and ET was overestimated by 7%–9% for the 2010 data set. The accuracy of ET with conventional in 2010 for the same short was poor, because the Nash-Sutcliffe coefficient of efficiency was negative. Therefore, using a variable for alfalfa as a function of LAI or improved the estimation of alfalfa hourly actual ET.
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Acknowledgments
The authors are grateful for financial support received through the Colorado Agricultural Experiment Station (CAES) and USDA National Institute of Food and Agriculture (NIFA) (Grant No. COL00602A). They are also thankful for the contributions of Lane Simons of CSU AVRC and Colorado State University graduate students Evan Rambikur, Mcebisi Mkhwanazi, and Stuart Roy.
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©2019 American Society of Civil Engineers.
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Received: Aug 23, 2018
Accepted: Apr 19, 2019
Published online: Aug 8, 2019
Published in print: Oct 1, 2019
Discussion open until: Jan 8, 2020
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