Abstract
Two-dimensional shallow water and advection-dispersion equations were applied to describe the surface water and solute transport processes in basin fertigation. Then the fully implicit temporal solution was constructed for all terms of the governing equations in triangular spatial grid and an iterative coupled model for basin fertigation was developed. Furthermore, the lower-upper matrix decomposition and symmetric Gauss-Seidel iteration solution methods were applied to construct a noniterative coupled model for basin fertigation. The convergence of the simulated results with decreasing time step was exhibited by the dam-break test. Furthermore, the performance comparison was analyzed on the basis of three basin fertigation experiments. The results show that the noniterative coupled model presents higher efficiency than and accuracy similar to the iterative coupled model. Thus, the noniterative coupled model was proposed for the management and design of basin fertigation. Finally, the noniterative coupled model was applied to obtain the diagram of the relationship between fertilizer application time and uniformity.
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Acknowledgments
This research is supported by the National Key R&D Program of China (2017YFC0403201) and the National Natural Science Foundation of China under Grant Nos. 51579250 and 51779273.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 145 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 7, 2017
Accepted: Jul 26, 2018
Published online: Nov 14, 2018
Published in print: Jan 1, 2019
Discussion open until: Apr 14, 2019
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