|Horton, Robert - IOWA STATE UNIVERSITY|
Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: April 1, 1998
Publication Date: N/A
Technical Abstract: A simple method for estimating the immobile water content and mass exchange coefficient for the mobile/immobile solute transport model is presented and evaluated. The model is based on sequential application of conservative tracers and a simple analysis that ignores solute dispersion. The method is useful for laboratory and field applications. A numerical study indicated the experimental conditions to which the method can be best applied. Laboratory tests indicated that the simple method provides values of the mass exchange coefficient and immobile water content similar to those obtained from applying inverse methods to solute breakthrough curve data. This method is the only practical method available for determining these solute transport parameters in the field. Finally, since tension infiltrometers can be used to apply the tracers, field soil hydraulic properties including soil water retention and unsaturated hydraulic conductivity, can be determined at the same time that the mass exchange coefficient and immobile water content are determined.