Physics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30uhls1s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 21, pp. HLS 1-1, CiteID 2083, DOI 10.1029/2003GL018418
Physics
6
Hydrology: Unsaturated Zone, Hydrology: Soil Moisture, Hydrology: Chemistry Of Fresh Water
Scientific paper
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.
Gower Drew B.
Herman Janet S.
Hornberger George M.
Saiers James E.
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