不同孔隙条件下饱和土壤内Cl^-运移规律试验

Cl^- Transport in Saturated Soils under Different Pore Conditions

通过研究土壤介质中溶质的运移特征,可以更加全面地了解污染物的迁移规律和演变机理,以便控制污染物的扩散范围,降低危害程度。基于溶质运移基本理论开展一维土柱实验,通过5组试验探讨不同孔隙条件下饱和土壤内Cl^-运移规律。分析比对5组土柱Cl^-的运移曲线和特征,表明土壤孔隙特征显著影响Cl^-的运移规律:在相同实验条件下,土壤颗粒越大,介质孔隙度也越大,溶质运移越快,Cl^-在土柱中穿透用时越短,水动力弥散系数越大。最后得出孔隙度n与水动力弥散系数DL的关系为:DL=0. 058e3. 172n。

By studying the transport characteristics of solute in soil media, we can get a more comprehensive understanding of the migration rules and evolution mechanism of pollutants in order to control the spread of pollutants and reduce the harm degree. In this study, a1-dimensional soil column experiment was carried out based on the basic theory of solute transport, and 5 groups of experiments were conducted to investigate the Cl^- transport in saturated soils under different pore conditions. Analysis and comparison of the Cl^- transport curves and characteristics of 5 groups of soil columns indicate that the pore characteristics of soil significantly affect the migration of Cl^-: Under the same experimental conditions, the larger the soil particles are, the larger the porosity of the medium, the larger the solute transport and the shorter the penetration time of Cl^- in the soil column and the larger the hydrodynamic dispersion coefficient. Finally, the relationship between porosity n and hydrodynamic dispersion coefficient DL.