咸淡水界面水敏性影响因素研究  

Research on factors affecting water sensitivity of saltwater-freshwater interface

作　　者：韩志勇[1] 陈继红[1] 李秀芳[1] 谢刚[1] 

机构地区：[1]兰州理工大学石油化工学院,兰州730050

出　　处：《四川环境》2007年第3期46-49,共4页Sichuan Environment

基　　金：国家自然科学基金资助项目(40572142)

摘　　要：通过砂柱的水击试验,对盐浓度、水流速度、pH值对咸淡水界面水敏性的影响进行了研究。试验结果表明,咸淡水界面上存在临界盐浓度值和临界流速值,当入流溶液浓度达到临界盐浓度和流速达到临界流速时,都会产生颗粒释放现象,导致砂柱的渗透率下降,水敏性发生。在相同的盐浓度和进水流速条件下,进水的pH值越低,颗粒释放的速度越慢,释放总量越少;进水的pH值越高,颗粒释放的速度越快,释放总量越多。This paper studied the effect of salt concentration, flow speed and pH on the water sensitivity of saltwater-freshwater interface by means of sand-column＇s flow experiments. It showed that there exists critical salt concentration and critical flow speed on the saltwater-freshwater interface. It appeared the phenomena of fine releasing when the in_fluent conditions reached the critical concentration and critical flow speed leading to permeability reduction and water sensitivity of sand-column. At certain conditions of salt concentration and flow speed, the lower the pH, the slower the particle release, sequentially the less the total releasing amount, and vice versa.

关 键 词：咸淡水界面 水敏性 临界盐浓度 临界流量 颗粒释放 

分 类 号：X523[环境科学与工程—环境工程]