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土壤圈(英文版). 2004, (03)

An Analytical Solution for Advance of Solute Front in SoilsEnglish Full Text

LIU Chun-Ping, SHAO Ming-An, LU Dian-Qing, XIA Wei-Sheng and CAI Song-Bai Department of Resource and Environment Science, Hunan Normal University, Changsha 410006 (China). Institute of Geographical Sciences and Natural Resources Research, Beijing 100101 (China) Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100 (China)

Abstract: Based on the assumption that solute transport in a semi-infinite soil column or in a field soil profile can be described by the boundary-layer method, an analytical solution is presented for the advance of a solute front with time. The traditional convection-dispersion equation （CDE） subjected to two boundary conditions: 1) at the soil surface （or inlet boundary） and 2) at the solute front, was solved using a Laplace transformation. A comparison of resident concentrations using a boundary-layer method and an exact solution （in a semi-infinite-domain） showed that both were in good agreement within the range between the two boundaries. This led to a new method for estimating solute transport parameters in soils, requiring only observation of advance of the solute front with time. This may be corroborated visually using a tracer solution with marking-dye or measured utilizing time domain reflectometry （TDR）. This method is applicable to both laboratory soil columns and field soils. Thus, it could be a step forward for modeling solute transport in field soils and for better understanding of the transport processes in soils.
Keywords：

analytical solution; parameter estimation; solute front; solute transport;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S153

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