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Published online 27 October 2005
Published in Soil Sci Soc Am J 69:1871-1880 (2005)
DOI: 10.2136/sssaj2004.0162
© 2005 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Monitoring and Modeling Lateral Transport through a Large In Situ Chamber

James L. Starra, Ali M. Sadeghia,* and Yakov A. Pachepskyb

a USDA-ARS Environmental Quality Lab., Bldg. 007, 10300 Baltimore Ave., Beltsville, MD 20705
b USDA-ARS Environmental Microbial Safety Lab., Beltsville, MD 20705



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  		Fig. 1. Schematic of the in situ stainless steel chamber (0.9 by 0.9 by 1.2 m) layout and instrumentation for water table control, and the water inlet and outlet system.

 


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  		Fig. 2. Bromide and NO3 breakthrough curves across nine outlet ports at three outlet rows.

 


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  		Fig. 3. Experimental data on flow and transport: (a) total water fluxes at the outlet rows, (b) variability (standard deviation) in water fluxes among individual outlets, (c) number of flowing individual outlet ports, (d) mean Br concentrations by row, (e) standard deviation in Br concentrations by row, (f) flux-averaged Br concentrations by row, (g) mean NO3 concentrations by row, (h) standard deviation in NO3 concentrations by row, (i) flux-averaged NO3 concentrations for the outlet rows. Symbols: • = Row 2, {blacksquare} = Row 3, {blacktriangleup} = Row 4, {blacktriangledown} = Row 5.

 


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  		Fig. 4. Normalized flux-averaged Br and NO3 breakthrough concentrations.

 


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  		Fig. 5. Measured (symbols) and simulated (lines) flux-averaged Br breakthrough by row.

 


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  		Fig. 6. HYDRUS-2D analysis vector-plot of flow velocities within the soil monolith.

 


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  		Fig. 7. HYDRUS-2D Br lateral transport simulations within the soil monolith at four times after the initiation of the 1.08-d Br-tracer pulse.

 


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  		Fig. 8. Measured and simulated flux-averaged NO3 breakthrough concentrations.

 




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