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COUPLED SURFACE-SUBSURFACE FLOW MODEL FOR SURFACE IRRIGATION MANAGEMENT

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032015,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13991) @2003
Authors:   D. Zerihun, A. Furman, A.W. Warrick, and C.A. Sanchez
Keywords:   Surface irrigation, coupled surface-subsurface model, management

The availability of a process-based coupled surface-subsurface model can lead to improved surface irrigation/fertigation management practices. In this study, a one-dimensional zero-inertia model is coupled with a one-dimensional unsaturated zone water flow model: Hydrus1D. A driver program is used to effect internal iterative coupling of the surface and subsurface flow models. Flow depths calculated using the surface flow model are used as Dirichlet boundary conditions for the subsurface flow model and infiltration rates calculated by the subsurface model are used in the mass balance calculations of the surface flow model. The maximum mean absolute difference between field observed and model predicted advance was 2.0 min. The model was tested using field data and was found to perform satisfactorily. In addition, the applications of the coupled model in improved irrigation system management are highlighted.

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