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Published online 24 August 2006
Published in Vadose Zone J 5:1035-1047 (2006)
DOI: 10.2136/vzj2005.0151
© 2006 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Colloid-Facilitated Solute Transport in Variably Saturated Porous Media

Numerical Model and Experimental Verification

Jirka Simuneka,*, Changming Hea, Liping Pangb and S. A. Bradfordc

a Dep. of Environmental Sciences, Univ. of California Riverside, CA 92521
b Institute of Environmental Science & Research, Christchurch, NZ
c George E. Brown Jr. Salinity Laboratory, USDA, ARS, Riverside, CA 92521

Figure 1
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  		Fig. 1. Schematic of the (top) colloid transport and (bottom) colloid-facilitated solute transport model.

 

Figure 2
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  		Fig. 2. Observed Br, Bacillus subtilis spores, and Cd breakthrough curves for the column experiment of Pang et al. (2005).

 

Figure 3
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  		Fig. 3. (a) Observed and simulated Br, (b) Bacillus subtilis spores, and (c) Cd breakthrough curves for the column experiment of Pang et al. (2005).

 

Figure 4
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  		Fig. 4. Sensitivity of simulated breakthrough curves to the (top) distribution coefficient Kd; (middle) adsorption coefficients to mobile and immobile colloids kamc and kaic, respectively; and (bottom) desorption coefficients from mobile and immobile colloids kdmc and kdic, respectively. The first position in parentheses in the legend represents kamc and kaic, the second kdmc and kdic, and the third Kd.

 




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