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.
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)
关键词
咸淡水界面
水敏性
临界盐浓度
临界流量
颗粒释放
Saltwater-freshwater interface
water sensitivity
critical salt concentration
critical flow speed
particle release
