摘要
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，发现在洛河下游，对于相对惰性的组分，河水的化学成分由河水与地下水混合形成，并且从水化学的角度验证了在该区段补给河水的那部分地下水主要来自洛河以南的地下水；但对于易发生化学反应的组分，河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，计算出洛河上游河水中地下水的补给比例在20～30％左右，下游地下水补给比例约占70％左右；并且根据研究区的具体条件及矿物饱和指数的计算结果，确定了石膏、方解石的溶解和白云石的沉淀以及碳酸平衡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，恢复了河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 of hydrogeology of the study area, the characteristics of chemical compositions of riverwater and groundwater were analyzed. The results show that for the relatively inert species, the compositions of the riverwater can be obtained by the mixing of groundwater with riverwater in the upper part of the river, And from the angle of water chemistry aqueous, proving that which recharging source mainly comes from groundwater in the Southern of Luo river, but for the reactive species, their compositions are obviously affected by water - rock interactions. By using the mass balance of C1 - , the mixing proportion of groundwater in upper - reach of the river is calculated to be 20 - 30% , But that in lower reaches of the river is about 70%. According to the conditions of the study area and calculated saturation index of minerals, the dissolution of gypsum and calcite, precipitation of and dolomite, aswell as the Carbonate Equilibrium are the main chemical reactions in the formation of the riverwater compositions. The amount of the above reactions are calculated and the composition of mixingwater before the chemical reaction is restored.
出处
《地下水》
2010年第5期10-13,共4页
Ground water
基金
中国地质调查局项目"陕西省大荔县高氟水调查评价(1212010634713)
关键词
洛河
大荔县
混合
溶解/沉淀
形成机制
Groundwater vulnerability
assessment and the index system
