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Published online 26 July 2006
Published in Vadose Zone J 5:886-893 (2006)
DOI: 10.2136/vzj2005.0105
© 2006 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Heterogeneity Effects on Solute Breakthrough Sampled with Suction Cups

Numerical Simulations

Lutz Weihermüller*, Roy Kasteel and Harry Vereecken

Agrosphere Inst., ICG IV, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

Figure 1
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  		Fig. 1. Cross-section of the flow domain with suction cup.

 

Figure 2
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  		Fig. 2. Soil hydraulic properties (a) soil water retention curve (volumetric water content {theta} vs. pressure head {psi}) and (b) relative hydraulic conductivity function (hydraulic conductivity K vs. {psi}) for the reference soil and the suction cup.

 

Figure 3
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  		Fig. 3. Absolute value of the log10-transformed water flux |Jw| for the various sets of simulations for heterogeneous soils with {sigma}2f of 0.25 and correlation length {lambda}f of 10 cm: (a) Simulation 18-1, (b) Simulation 34-1, (c) Simulation 40-1, (d) Simulation 56-1, (e) Simulation 65-1, and (f) Simulation 88-1.

 

Figure 4
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  		Fig. 4. Bromide breakthrough curves for various simulations for a homogeneous and heterogeneous soils with {sigma}2f of 0.25 and correlation length {lambda}f of 10 cm, assuming an applied suction of 60 cm in the suction cup.

 

Figure 5
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  		Fig. 5. Arithmetic mean, standard deviation, and standard error of the mean for the transport parameters: (a) mean pore water velocity, (b) dispersivity, and (c) mass recovery as calculated from 100 simulations.

 




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