Coupled Surface–Subsurface Solute Transport Model for Irrigation Borders and Basins. II. Model Evaluation
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Volume 131, Issue 5
Abstract
The development of a coupled surface–subsurface solute transport model for surface fertigation management is presented in a companion paper (Part I). This paper discusses an evaluation of the coupled model. The numerical solution for pure advection of solute in the surface stream was evaluated using test problems with steep concentration gradients. The result shows that the model can simulate advection without numerical diffusion and oscillations, an important problem in the solution of the advection–dispersion equation in advection dominated solute transport. In addition, a close match was obtained between the numerical solution of the one-dimensional advection–dispersion equation and a simplified analytical solution. A comparison of field data and model output show that the overall mean relative residual between field observed and model predicted solute breakthrough curves in the surface stream is 16.0%. Excluding only two outlier (in the graded basin data) reduces the over all mean relative residual between field observed and model predicted breakthrough curves to 5.2%. Finally, potential applications of the model in surface fertigation and salinity management are highlighted.
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Acknowledgment
The writers are grateful to the USDA–NRI competitive grants program for funding the research reported in this paper.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 131 • Issue 5 • October 2005
Pages: 407 - 419
Copyright
© 2005 ASCE.
History
Received: Jul 26, 2004
Accepted: Dec 30, 2004
Published online: Oct 1, 2005
Published in print: Oct 2005
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