摘要:
本文通过对大同盆地2004年孔隙地下水水化学资料的分析发现,盆地内孔隙地下水的水化学特征在水平方向上具有以盆地中部为中心,呈环状分布的特点,且与盆地水动力分区具有很好的一致性。由山前冲洪积倾斜平原到中部冲湖积平原,地下水依次经历了补给区、径流区和排泄区,相应的主要水化学类型分别为HCO3型、HCO3.SO4型和HCO3.SO4.Cl型。与中深层孔隙水相比,浅层孔隙水由于水位埋深浅,蒸发浓缩强烈,易受人类活动的影响,各组分的含量较高,变化幅度较大,水化学类型也相对复杂。浅层地下水的水质呈好转趋势,深层地下水水质基本保持稳定。
Abstract:
By analyzing hydrochemical data of groundwater in the unconsolidated sediments collected in 2004,it is found that hydrochemical features of groundwater are well accordant with the hydrodynamic zones in the Datong Basin.From the mountain area to the basin groundwater flows through the recharge,subsurface runoff area and discharge area,and groundwater is dominated by HCO-3 type,HCO3·SO-4 type,and HCO3·SO4·Cl-type water,respectively.Compared to groundwater in the medium-deep-seated aquifers,the major constituents groundwater in the shallow aquifers,which is characterized by more complex hydrochemical types to a greater degree because of intensive evapotranspiration owing to high groundwater level and arid climate from the mountain area to the basin area,and contamination induced by human activities.The quality of shallow groundwater tends to be better except the central part of the Datong Basin;while the quality of groundwater in the medium-deep-seated aquifers generally does not changes significantly.
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