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Characterization of Macropore Flow Mechanisms in Soil by Means of a Split Macropore Column

Masoud Ghodratia, Michael Chendoraina and Y.Jason Changa

a Division of Ecosystem Sciences, Dep. of Environmental Science, Policy, and Management, Univ. of California, Berkeley, CA 94720-3110 USA



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Fig. 1 Diagram of the Split Macropore Column (SMC) showing the face and top view (not to scale)

 


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Fig. 2 Influence of the SMC on producing preferential flow patterns. Dye transport patterns at JP where a) the column is poorly packed (depth is approximate), b) the macropore is sealed from inside, and c) the macropore screen is sealed using clay loam soil. V/VO represents the number of pore volumes

 


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Fig. 3 Effluent breakthrough curve from a large matrix (R), small macropore (r) column of a Botella clay loam at JP with a 1-cm pulse of bromide

 


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Fig. 4 Miscible displacement experiments in a large matrix (R), small macropore (r) column of silica sand with red dye at JW = a) JP, b) 66% JP, and c) 33% JP

 


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Fig. 5 Effluent breakthrough curves from a large matrix (R), small macropore (r) column of silica sand with a 1-cm pulse of nitrate at JW = a) JP, b) 66% JP, and c) 33% JP

 


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Fig. 6 Effluent breakthrough curves of silica sand at 1-cm head with a 1-cm pulse of nitrate in a) large matrix (R), large macropore (r), b) large matrix (R), small macropore (r), c) small matrix (R), large macropore (r), and d) small matrix (R), small macropore (r) columns

 





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The Plant Genome
Copyright © 1999 by the Soil Science Society of America.