Field Experiment and Stochastic Analysis of Solute Transport in an Unsaturated Soil
Solute concentration and water content were measured at a depth to 170 cm in an
unsaturated field soil. Soil water movement and solute transport in the local scale
were studied and the spatial variability of the soil water content and concentration
were discussed. As compared with the water content, the concentration
distribution shows a large variation. The immobile water content is about 24 to
39 percent of the total water content in the experiment. The flux velocity is
described with a log normal distribution function. The mean and variance of the
concentration are calculated using the convection equation, the convection-dispersion
equation with the stochastic velocity, and the classical convection-dispersion
equation. It is shown that the concentration variance is proportional
to the concentration gradient and inversely proportional to the local dispersivity.
The maximum concentration variance is near the concentration front.
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