Graduate Thesis Or Dissertation
 

Evaluation and sensitivity of a soil-water-atmosphere-plant simulation model

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  • Evaluation and sensitivity analysis of a soil-water--- atmosphere-plant simulation model, SWATRE, developed by Feddes et al (1978) in The Netherlands was conducted. The evaluation was performed with the observed data obtained by Cuenca (1978) for three different irrigation levels in UC82 variety tomato fields in Davis, California. SWATHE requires about one hundred different input data from the soil-water-atmosphere-plant (SWAP) system. Since the specific required data were not available in every case, unique approaches were applied to define a root sink function, soil characteristic curve, rooting depth, soil hydraulic conductivity, and saturated soil moisture content. The basic water balance equation of SWATRE is a function of the differential soil Ti tie: Evaluation and Sensitivity of a Soil-Water-Atmosphere-P1ant Simulation Model moisture capacity, hydraulic conductivity, and root sink function (Feddes et al., 1978). Additionally potential evapotranspiration affects the simulation of the SWAP system significantly. The importance of these variables was investigated by applying sensitivity analysis.
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