External Iterative Coupling Strategy for Surface-Subsurface Flow Calculations in Surface Irrigation
Publication: Journal of Irrigation and Drainage Engineering
Volume 136, Issue 10
Abstract
Coupling the unsteady open-channel flow equations of surface irrigation with the equation of variably saturated porous media flow is a computationally complex problem because of the dependence of infiltration on surface-flow depths. Several models of this coupled process have been developed, all of which solve the surface and subsurface flow iteratively at each time step of the surface-flow solution. This study presents an alternative strategy, in which stand-alone surface and subsurface-flow models are used to conduct the calculations sequentially and iteratively at the time level of the irrigation event. At each iteration, the subsurface-flow results are computed using the surface-flow depths generated by the surface-flow model at the current iteration. Infiltration results computed at selected computational nodes are fitted to an empirical infiltration function, and then fed back to the surface-flow model. The proposed strategy, labeled external iterative coupling, was prototyped for border and basin irrigation systems using the WinSRFR and HYDRUS-1D models. The proposed procedure produced irrigation performance results comparable to those generated with an internally coupled model, even when using a single representative location to calibrate the empirical infiltration equation used by the surface-flow model. In comparison with models that iterate at each time step, the proposed coupling strategy reduces the computational effort and improves convergence. The approach provides a practical alternative for coupling existing and future surface and subsurface flow models.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 136 • Issue 10 • October 2010
Pages: 692 - 703
Copyright
© 2010 ASCE.
History
Received: Nov 25, 2009
Accepted: Apr 5, 2010
Published online: Apr 9, 2010
Published in print: Oct 2010
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