Integrated Salt and Water Balance Modeling for the Management of Waterlogging and Salinization. I: Validation of SAHYSMOD
Publication: Journal of Irrigation and Drainage Engineering
Volume 138, Issue 11
Abstract
Irrigated agriculture faces serious threats of waterlogging and soil salinization in the arid and semiarid regions of the world. In this paper, an integrated spatial-agro-hydro-salinity model (SAHYSMOD) was used to analyze water and salt balances of an irrigated semiarid area located in the Haryana State of India where the groundwater level is rising continuously. The calibration, validation, error analysis, and sensitivity analysis of the model parameters were performed. The sensitivity analysis revealed that hydraulic conductivity is the most sensitive model parameter for both groundwater levels and salinities, followed by effective porosity of the aquifer. The leaching efficiency of the soil is sensitive only to the groundwater salinities. The results show a good agreement between the simulated and observed groundwater levels and salinities for almost all the nodes during the calibration and validation periods. The results are also substantiated by the high R-squared values and low mean error (ME) and root mean square error (RMSE) values. On the basis of the results, it could be concluded that the SAHYSMOD performed very well in predicting groundwater levels and salinities during the calibration and validation periods.
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Acknowledgments
The authors convey their sincere thanks to the Groundwater Cell and Department of Agriculture, Rohtak; Irrigation Department, Rohtak and Jhajjar; and India Meteorological Department, Pune for providing necessary data for this study. The authors are also very thankful to Dr. R. J. Oosterbaan of the ILRI, Netherlands for providing the useful information regarding his software SAHYSMOD during the course of its use.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 138 • Issue 11 • November 2012
Pages: 955 - 963
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 26, 2012
Accepted: May 16, 2012
Published online: Oct 15, 2012
Published in print: Nov 1, 2012
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