南水北调水源北京西郊回灌的水岩相互作用模拟

南水北调水进京后余裕水可能回灌至地下储存，以涵养严重亏损的地下水资源。为研究地下回灌后的水岩相互作用，为南水北调水的合理利用提供技术参考，本次试验利用丹江口水库水和北京西郊地下水、西郊砂样开展了两地原水七种配比下的模拟含水层试验。结果表明:当含水层中丹江口水库水占比较高时，可能发生程度较高的阳离子交换吸附和钾长石的溶解；各含水层发生硝化反应，且丹江水占比越高，硝化反应越显著；各含水层发生显著的碳酸平衡作用，白云石和方解石在饱和状态下持续溶解并趋于稳定，表明南水北调水回灌将引起地下水硬度的升高。

Simulation of water-rock interaction in the injection of water from the South-to-North Diversion Project to the aquifer in the western suburb of Beijing

Part of the water from the South to North Diversion Project may be stored in aquifer for groundwater conservation. To examine water rock interactions and provide reference for water use, the experiment tests are conducted using the water from the Danjiangkou reservoir, the groundwater and the sand in the western suburb of Beijing to carry out seven aquifer simulations with the two water sources. The result shows that when the percentage of the Danjiangkou water is large, the cation exchange adsorption and the potassium feldspar dissolution may occur. Explicit nitrification occurs in each aquifer. The larger the percentage of the Danjiangkou water, the more obvious the nitrification. The carbonate balance may generate in each aquifer. Dolomite and calcite are dissolved in each simulation aquifer under the supersaturation state, indicating that injection using the Danjiangkou water will lead to the rise in groundwater hardness.