Nonuniform and Unsteady Solute Transport in Furrow Irrigation. II: Description of Field Experiments and Calibration of Infiltration and Roughness Coefficients
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Irrigation and Drainage Engineering
Volume 137, Issue 5
Abstract
Field tests were conducted to obtain irrigation evaluation and solute transport data. The data were used to calibrate and validate an advection-dispersion model for furrow irrigation. The empirical infiltration equation and roughness parameters were estimated from the evaluation data. The inflow rate was measured with a volumetric meter and a flume and resulted in different average inflow rates. Hydraulic simulation results proved nearly as accurate with infiltration function estimates derived from the meter or flume data despite the difference in measured flow rate. Hence, the calibrated infiltration functions provide limited clues about possible problems with the inflow data. The choice of the infiltration equation used to fit the data (Branch versus modified Kostiakov) produced greater differences in the hydraulic modeling results. The timing and spread of the solute concentration pulses were well predicted independently of the inflow data and infiltration equation used to fit the data. However, differences between the meter and flume inflow rate were clearly manifested in the predicted peak solute concentrations. Results highlight the importance of accurate inflow measurements for parameter estimation.
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Acknowledgments
This research received support from USDA-CSREES-NRI Competitive Grant No. UNSPECIFIED2001-35102-10218. The writers would like to thank anonymous reviewers for helping to improve the manuscript. We also appreciate the support from Carl Arterberry, Don Powers, and Clint Jones of the U.S. Water Conservation Laboratory, Phoenix, in preparation and conduct of the field tracer experiment and subsequent activities.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 137 • Issue 5 • May 2011
Pages: 315 - 326
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 8, 2010
Accepted: Aug 30, 2010
Published online: Sep 30, 2010
Published in print: May 1, 2011
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