| An analytical solution for advance of solute front in soils |
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| 作者姓名： | LIU Chun-Ping SHAO Ming-An LU Dian-Qing XIA Wei-Sheng CAI Song-Bai |
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| 作者单位： | [1]DepartmentofResourceandEnvironmentScience,HunanNormalUniversity,Changsha410006（China） [2]InstituteofGeographicalSciencesandNaturalResourcesResearch,Beijing100101（China） [3]InstituteofSoilandWaterConservation,ChineseAcademyofSciences,Yangling712100（China） |
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| 基金项目： | *1Project supported by the National Key Basic Research Support Foundation of China (No.2000018605) and the National Natural Science Foundation of China (Nos.40025106 and 40371060). |
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| 摘 要： | 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.
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| 关 键 词： | 评估参量 溶质传递 农业土壤 化学物质 |
An analytical solution for advance of solute front in soils |
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| LIU Chun-Ping,SHAO Ming-An,LU Dian-Qing,XIA Wei-Sheng,CAI Song-Bai.An analytical solution for advance of solute front in soils[J].Pedosphere,2004,14(3):339-346. |
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| Authors: | LIU Chun-Ping SHAO Ming-An LU Dian-Qing XIA Wei-Sheng and CAI Song-Bai |
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| Institution: | Department of Resource and Environment Science, Hunan Normal University, Changsha 410006 (China). E-mail: zhxy@hunnu.edu.cn;Institute of Geographical Sciences and Natural Resources Research, Beijing 100101 (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);Department of Resource and Environment Science, Hunan Normal University, Changsha 410006 (China). E-mail: zhxy@hunnu.edu.cn;Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100 (China);Department of Resource and Environment Science, Hunan Normal University, Changsha 410006 (China). E-mail: zhxy@hunnu.edu.cn;Department of Resource and Environment Science, Hunan Normal University, Changsha 410006 (China). E-mail: zhxy@hunnu.edu.cn |
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| 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. |
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| Keywords: | analytical solution parameter estimation solute front solute transport |
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