Permeability variations of porous media at the seawater-freshwater interface
Based on hydrogeologic investigation in the field and a developed experimental setup, seawater and freshwater were made to flow through a plexiglass column filled with sand samples from the downstream portion of the Dagu River. Water sensitivity at the saline water-freshwater interface was studied by changing salinity sharply and gradually. The results showed that the permeability of porous media decreased by 64％ when seawater was flushed by freshwater. However, the decrease of permeability was comparatively slow and the permeability decreased by 50％ when salinity was allowed to gradually decrease. With increasing rate of salinity decrease, the degree of permeability increased. A significant decrease of hydraulic conductivity was observed with time and the decrease was irreversible. Due to rapid salinity reduction of the influent, the migration and interception of the released clay particles such as illite, kaolinite and chlorite resulted in the permeability change.
X.L.Zheng G.Q.Lin X.H.Zhang
Institute of Environmental Science and Engineering, Ocean University of China, Qingdao, Shandong, China
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
559-562
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）