文章摘要
赵康, 郑晓丽, 陈冲, 商建英.非均质性对保守溶质及蒙脱石胶体在饱和多孔介质中运移的影响[J].水土保持学报,2018,32(3):140~145
非均质性对保守溶质及蒙脱石胶体在饱和多孔介质中运移的影响
Effects of Heterogeneity on Migration of Tracer and Montmorillonite Colloid in Saturated Porous Medium
投稿时间:2017-11-28  
DOI:10.13870/j.cnki.stbcxb.2018.03.022
中文关键词: 非均质性  保守溶质  蒙脱石胶体  穿透曲线  滞留曲线
英文关键词: heterogeneity  tracer  montmorillonite colloid  breakthrough curve  retention curve
基金项目:国家自然科学基金项目(41501232)
作者单位E-mail
赵康1,2,3, 郑晓丽1, 陈冲1, 商建英1,2,3 1. 中国农业大学资源与环境科学学院, 北京 100193

2. 教育部植物-土壤相互作用重点实验室
, 北京 100193

3. 农业部华北耕地保育重点实验室
, 北京 100193 
jyshang@cau.edu.cn 
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中文摘要:
      选取2种粒径玻璃珠构建6种不同构型的柱子(2个均质和4个非均质),研究了饱和条件下多孔介质构型对保守溶质和蒙脱石胶体运移的影响。结果表明:在2种均质介质中,保守溶质的穿透曲线相似且对称,蒙脱石胶体在大粒径玻璃珠中的移动性更强。当介质中存在大孔隙通道时,优先流现象的出现会加速保守溶质和蒙脱石胶体的迁移,大孔隙通道与周围介质交界面越大保守溶质和蒙脱石胶体的拖尾现象越明显且穿透峰较低。在大、小粒径玻璃珠均匀混合填装的柱子中,保守溶质穿透曲线形状与均质柱子相似,蒙脱石胶体的移动性介于大、小粒径玻璃珠均匀填装的柱子之间。蒙脱石胶体在玻璃珠分层填装的柱子中,大粒径与小粒径交界面区域会有更多的蒙脱石胶体滞留。研究表明非均质性对保守溶质和蒙脱石胶体在土壤和地下环境中的运移过程有重要的影响。
英文摘要:
      In six structurally packed columns (two homogeneous and four heterogeneous) constructed with two kinds of glass beads, we studied the effect of media heterogeneous on the transport behaviors of tracer and montmorillonite colloids in saturated condition. The results showed that the breakthrough curves of tracer were similar in two homogeneous columns, and the mobility of montmorillonite colloids in coarse media was stronger than that in fine media. For the column containing macroporous channel, the presence of preferential flow path resulted in an earlier breakthrough of tracer and montmorillonite colloids, and larger contact area between macroporous channel and fine grains caused a lower breakthrough peak and a stronger tailing. In column packed with homogeneous mixture of coarse and fine grains, the shape of tracer breakthrough curves were similar to that in homogeneous columns, and the mobility of montmorillonite colloid was between that in the homogeneous columns (coarse and fine grain). More montmorillonite colloids were retained at coarse-fine grain interface in the layered column. The results have shown that heterogeneity has an important effect on the transport of the tracer and montmorillonite colloid in soil and underground environment.
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