| 土柱试验中充填介质对纵向弥散系数的影响研究简 |
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| 引用本文： | 石健,张彦,邹开云,杨存满,高尚.土柱试验中充填介质对纵向弥散系数的影响研究简[J].安徽农业科学,2013(21):9011-9013. |
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| 作者姓名： | 石健 张彦 邹开云 杨存满 高尚 |
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| 作者单位： | 南通大学化学化工学院,江苏南通226007 |
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| 基金项目： | 国家自然基金项目（21177067）;江苏省自然基金重点项目（BK2010034）;江苏省青蓝工程计划项目. |
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| 摘 要： | 通过室内一维土柱淋滤试验，选择NaCl为示踪剂，研究示踪剂在不同介质中的穿透行为，探讨不同介质由于自身特性对纵向弥散系数的影响。结果表明，土壤黏粒的增多会引起弥散系数的降低，由细砂的2×10-3cm2／s降低到掺土样品的3×10-4～4×10-4cm2／s左右，且弥散系数会随着容重的减小而减小，由1．25×10-2cm2／s减小为3．87×10-4cm-2／s。另外，有机质含量也会影响柱内有机污染物的弥散，表现为有机质舍量高的柱内弥散稍大于有机质含量低时柱内的弥散。
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| 关 键 词： | 土柱 充填介质 污染物 纵向弥散系数 |
Effects of Porous Medium on Longitudinal Dispersion Coefficient by Soil Column Experiment |
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| Institution: | SHI Jian et al ( School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226007) |
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| Abstract: | Through an indoor one-dimensionalsoil column leaching experiment, with NaCI as the tracer, the penetration behavior of tracer in different mediums was studied, and effects on longitudinal dispersion were discussed, The results showed that the diffusion coefficient will be lower with increasing of soil clay, the coefficient from 2 × 10 -3 cm2/s down to3 × 10 -4 -4 × 10 -4 cm2/s, and the diffusion coefficient decrea- ses with the density reducing, decreases from 1.25 × 10 -2 to 3.87 × 10 -4 cm2/s. In addition, organic matter content will also affect the dis- persion in the column of organic contaminants i manifested as dispersion in the column with high organic matter content is larger than that with lower organic matter content. |
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| Keywords: | Soil column Porous media Pollutants Longitudinal dispersion coefficient |
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