Temporal chemical stability of groundwater in impermeable fractured granite
Three test holes to 300m were drilled in compact fractured granite. The distance between the drill holes was about 10 m. Hydraulic conductivity through fracture zones was tested. The hydraulic conductivity coefficients usually decrease with depth and their range was from 2.9 × 10-11 to 1.6 × 10-6 m.s-1. Six months after the tests, one of the holes was equipped with packers to isolate 4 depth sections. Very small quantities of ground water were withdrawn monthly from the sections and analyzed. It was found that the drilling disturbed the chemical composition of groundwater and that the concentrations of dissolved components reached a steady state after a prolonged time. Each chemical component behaved differently and the time to achieve steady state took from 20 to 400 days depending on the dissolved component involved. Our examples of the temporal trends include dissolved Na, Ca, Mo and organic carbon. Causes for the observed trends are discussed.
T.Paces V.Blaha L.Rukavickova
Czech Geological Survey, Klarov, Praha, Czech Republic
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
1101-1104
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）