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南水北调水进京后部分水源可能回灌至地下储存,以涵养严重亏损的地下水资源。南水北调水源回灌过程中将经历包气带淋溶过程,为研究水源经过包气带介质的水质变化,开展了包气带淋溶试验研究。试验结果表明,南水北调水源在包气带中迁移过程中,水中的部分可溶盐分如K+、Na+、Mg2+、Cl-、SO42-、HCO3-、NH3-N、NO2-N、NO3-N及TDS等组分浓度呈降低并趋稳的变化特征,而Ca2+、pH值则呈现出升高并趋稳的变化特征,所有可溶组分最终都趋向于进水浓度。从水岩相互作用的角度探讨了水质变化机理,对南水北调水源在北京市的回灌具有一定的参考价值。
Some water sources in South-to-North Water Transfer Project to Beijing may be recharged to underground storage to contain serious losses of groundwater resources. In the process of water recharge, the process of leachate will undergo leachate. To study the change of water quality of the medium through the aeration zone, a leaching experiment of aeration zone was carried out. The results showed that some of the soluble salts in the water such as K +, Na +, Mg2 +, Cl-, SO42-, HCO3-, NH3-N, NO2-N, NO3- N and TDS The concentration of other components decreased and stabilized. However, Ca2 + and pH showed the characteristics of increasing and stabilizing. All the soluble components eventually tended to influent concentration. The change mechanism of water quality is discussed from the perspective of the interaction between water and rock, which is of certain reference value to the recharge of water source of South-to-North Water Diversion Project in Beijing.