期刊
GEOPHYSICAL RESEARCH LETTERS
卷 30, 期 21, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2003GL018418
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The movement of colloid-sized particles through the vadose zone has important water-quality implications, yet the mechanisms that govern colloid mobilization are poorly understood. Results of our laboratory column experiments demonstrate that moving air-water interfaces associated with a downward-propagating drying front are capable of scouring kaolinite colloids from the surfaces of quartz sand. The efficiency of air-water interfaces in capturing the immobile colloids increases with increasing drying-front velocity and decreasing porewater ionic strength. A model that approximates the sand pack as a bundle of capillary tubes and that links pressure-head changes during drainage to the rates of air-water interface movement through the tubes reproduces the time-series data on effluent-kaolinite concentrations.
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