Abstract
Mixing length theory concept can successfully comprehend the dispersion phenomena inside the porous medium. Based on this theory, dispersion coefficient is expressed as a function of average pore water velocity; with mixing length of the water paths and coefficient of variation of pore water velocity as model parameters. In this study, characteristics of coefficient of variation of the pore water velocity, a model parameter is discussed based on Van Genuchten's suction- moisture content and hydraulic conductivity-moisture content relationships. Numerical analysis shows that the coefficient of variation of pore water velocity can be expressed as a function of only parameter m of Van Genuchten's suctionmoisture content relation. Based on this result, and the characteristics of mixing lengths, a new model for the dispersion coefficient is derived. The applicability of the proposed model is checked using the published data of previous researches.
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