摘要
通过对石羊河流域地下水化学特征的计算机模拟研究表明:武威盆地的部分地区及红崖山水库是白云石和方解石的溶解区,民勤盆地则是白云石和方解石的沉淀区,蒸发浓缩作用是控制这一过程的主要因素。影响武威盆地地下水化学特征的诸因素中降雨起主导作用,而民勤盆地蒸发浓缩起主导作用。SO2-3比值的上升4/HCO-标志着研究区地下水化学类型由重碳酸盐型向硫酸盐型转化,水质正在不断恶化。
Computer simulation method is one of the most powerful tools in studying evolution of groundwater geochemistry, water\|rock interaction and geochemical controls responsible for the water quality changes. And this method has been widely adopted to study groundwater geochemical process at present. Shiyang River basin is situated to the east of Hexi Corridor, with typical features of arid area, long exploitation history, abundant observation data and lots of water\|supplying wells. Therefore, the basin is selected as an ideal place to perform computer simulation study on its groundwater geochemistry. It is demonstrated that part of Wuwei basin and Hongyanshan reservoir are the calcite dissolution areas, whereas the Minqin basin is the precipitation area of dolomite and calcite, and the evaporation is the main controls on this process. The groundwater geochemistry of Wuwei basin is dominated by rainfall, and that of Minqin basin is controlled by evaporation. The rising of SO\+2-\-4/HCO\+-3 ratio indicates that the hydrochemical type of the study area is changing from bicarbonate to sulphate, implying the worsening trend of the regional groundwater quality.
出处
《中国沙漠》
CSCD
北大核心
2003年第2期160-164,共5页
Journal of Desert Research
基金
气体地球化学国家重点实验室主任基金(ZRJJ 01)
中国科学院"西部之光"项目资助
