都思兔河中段河水化学成分的形成机制分析

Formation mechanism of water compositions in the middle part of the Dousitu River

在分析研究区地质及水文地质条件的基础上,根据对各类水样资料的研究,发现在都思兔河中段,对于相对惰性的组分,河水的化学成分由湖水与地下水混合形成;但对于易发生化学反应的组分,湖水在向下游运动的过程中,其化学成分明显受到了化学反应的影响。论文使用Cl-质量平衡方法,计算出该段河水中地下水的补给比例在50%以上;并且根据研究区的具体条件及矿物饱和指数的计算结果,确定石膏的溶解、方解石和白云石的沉淀以及CO2逸出是河水化学成分形成的主要化学作用,通过对化学反应量的计算,恢复了湖水与地下水仅发生了简单混合作用的混合水的成分。

On the basis of analyses lake water, river water and ground compositions of the river water can river, but for the reactive species, of hydrogeology of the study area, the characteristics of chemical compositions of water were analyzed. The results show that for the relatively inert species, the be obtained by the mixing of groundwater with river water in the upper part of the their compositions are obviously affected by water-rock interactions mass balance of CI- , the mixing proportion of groundwater in this section of the river is calculated By using the to be exceed 50 %. According to the conditions of the study area and calculated saturation index of minerals, the dissolution of gypsum, precipitation of calcite and dolomite, as well as the outgasing of C02 are the main chemical reactions in the formation of the river water compositions. The amount of the above reactions are calculated and the composition of mixing water before the chemical reaction is restored.