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Prediction of Field Soil Water Content¹

ABSTRACT

A 3-year experiment was conducted to monitor and subsequently predict field water contents using the water transport model. Saturated hydraulic conductivities and soil water characteristic curve results were measured and averaged for each soil layer. The Millington-Quirk (MQ) method was used to calculate average model parameters. Direct use of the MQ-derived conductivity and diffusivity functions did not give an exact fit to the observed field results. However, when reasonable adjustments were made to the K() and D() functions the prediction was improved considerably. The methodology for "averaging" and utilizing field data to derive model parameters, and subsequent adjustment or optimization of the model parameters all require more research if we hope to use the unsaturated flow equation for field water content prediction.

¹ Contribution from Research Station, Research Branch, Agriculture Canada, Swift Current, Saskatchewan. S9H 3X2.

² Research Scientist, Res. Stn., Swift Current, Saskatchewan.

Received for publication July 24, 1978. Accepted for publication November 28, 1978.