Two-dimensional model for water, heat, and solute transport in furrow-irrigated soil .2. Field evaluation
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To maintain crop production in areas where irrigation water or soil contains a large amount of salt, proper management of water and soil is required. A model simulating salt movement in the field may be helpful for developing improved management practices. We developed a two-dimensional Galerkin finite element model to simulate transport of water, heat, and solute in furrow-irrigated soil. In this model, we considered the interaction of soil water content, temperature, and solute concentration on transport of water, heat, and solute. An energy balance equation was applied to each node along the simulated ridge-furrow soil surface to provide boundary conditions for water and heat transport. The model was compared with field measurements acquired in a loamy sand plot near College Station, TX. In the soil profile, distributions of water content and electrical conductivity were measured with time domain reflectometry, and distributions of temperature were measured with thermocouples. Solute concentration was estimated from electrical conductivity. The overall performance of the developed model was favorable when simulating distributions of water content, temperature, and solute concentration.
