Numerical simulation and prediction of Cd transport in soils different in texture
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    Abstract:

    Movement of Cd in soil profiles different in texture was simulated with the advection-dispersion equation for solute transport in an indoor experiment using soil columns. Results show that the chemical nonequilibrium one-site model (OSM) can be used to simulate Cd transport better in silty loam (R2=0.810) and loamy sand (R2=0.901) than in sandy loam (R2=0.542). The OSM can predict accurately the time for Cd to transport through the soil column, but not fit so well the trailing of the breakthrough curve of Cd. The retarding effect of the soil on Cd transport was related to soil physical and chemical properties, however, its mechanism needs to be studied further in depth. At the end, the parameters obtained from fitting with the aforementioned model were used to simulate transport of Cd in soil profiles consisting of soil layers. The simulated breakthrough curves didn’t reveal the heterogeneity of the soil profiles. As a result of the strong sorption of Cd by the upper sandy loam layer, it took a long time (10 pv) for Cd to pass through the profile. And moreover, the variation of Cd concentration and adsorption quantity at the interface of two soil layers different in texture was obvious.

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Lin Qing, XU Shaohui, Wang Kaili. Numerical simulation and prediction of Cd transport in soils different in texture[J]. Acta Pedologica Sinica,2013,50(3):478-485.

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History
  • Received:November 29,2012
  • Revised:January 23,2013
  • Adopted:January 31,2013
  • Online: March 05,2013
  • Published: