咸淡水界面上含水介质的水敏感性研究

被引：6

作者：

张晓辉

周骏

郑西来

林国庆

吴俊文

机构：

[1] 中国海洋大学环境科学与工程学院海洋环境与生态教育部重点实验室

来源：

海洋环境科学 | 2007年 / 04期

关键词：

咸淡水界面; 粘粒; 多孔介质; 水敏感性;

D O I：

暂无

中图分类号：

P341 [水文物理];

学科分类号：

081501 ;

摘要：

在野外水文地质调查的基础上,采集大沽河下游咸水入侵区砂样,通过室内渗流柱咸淡水驱替试验,分别研究了盐度突变和渐变条件下咸淡水界面上含水介质的水敏感性。研究结果表明,在盐度突变条件下含水多孔介质的渗透系数下降了50.0%,而在盐度渐变条件下渗透系数只下降了25.1%,溶液盐浓度递减速率越快则渗透性降低程度越大;随着渗透时间的延长,渗透系数可降低1～3个数量级,且渗透性的降低具有不可逆性。另外,本区渗透性发生变化主要是由伊利石、高岭石和绿泥石这些非膨胀性粘粒在渗流柱内迁移和沉积引起的。

引用

页码：301 / 304+312 +312

页数：5

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