UNIVERSAL CONSTANTS FOR SCALING THE EXPONENTIAL SOIL-WATER DIFFUSIVITY

The exponential form of the soil water diffusivity can be scaled either with the wetting front parameter Φf = xf/t½ or with the sorptivity A0 = F/t½; these variables, which arise in the problem of sorption in a dry soil, are xf the distance to the wetting front, t the time, and F the infiltrated water volume. It is shown that the three constants used in this scaling are not independent and that only one constant is needed. Copyright 1979 by the American Geophysical Union.