摘要
在了解研究区地质、水文地质条件的基础上,对区内15个潜水样品运用基于熵权的密切值法进行了水质综合评价,论述了研究区地下水赋存类型及其水化学特征,分析了其水化学形成机制,并重点利用溶液组分平衡模型计算了方解石、白云岩和石膏的饱和指数,利用质量平衡模型计算并分析了地下水成分沿流程的变化规律,定量分析了溶滤沉析作用对地下水化学成分的影响。结果表明:研究区潜水水质普遍较好,适合人类饮用。地下水水化学成分的形成与演化主要受溶滤沉析作用控制,其中方解石、白云石、石膏的沉淀作用、钾长石的溶解作用以及CO2的逸出是最主要的控制因素,同时地下水水化学成分的形成与演化还受到蒸发浓缩作用、阳离子交换作用、地下水混合作用以及人类活动的影响。
On the basis of understanding basic geological and hydro-geological conditions,the paper made comprehensive assessment on the 15 groundwater samples with osculating value method based on entropy weight.Discussed the groundwater occurrence type and hydro-chemical characters,analyzed its forming mechanism,calculated the saturation index of calcite,dolomite and gypsum with Equilibrium Speciation Model,as well as calculated and analyzed the change rule of groundwater elements along the flow path with Mass Balance Model and analyzed lixiviation influence to the groundwater chemical constituent quantitatively. The evaluation results indicated that groundwater quality in the study area is perfect and suitable for drinking.The formation and evolvement of groundwater chemical constituent were controlled by lixiviation,and precipitation of calcite,dolomite and gypsum,dissolution of potassium feldspar and escape of CO2 was the most important governing factor.Synchronously,the formation and evolvement of groundwater chemical constituent were also influenced by evaporation concentration,ion exchange,migmatisation and human activities.
出处
《水资源与水工程学报》
2010年第1期38-41,45,共5页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(40772160)
中央地质勘查基金煤炭试点项目(2007150004)
教育部国家外国专家局"111"学科创新引智计划(B08039)
关键词
地下水水质评价
水化学特征
水-岩作用
groundwater quality assessment
hydro-chemical characters
water-rock reaction
