洛阳断陷盆地浅层孔隙地下水环境演化特征

Evolutionary Characteristics of Shallow Pore Ground Water in Fault Basins

洛阳断陷盆地内河流冲积平原区浅层孔隙地下水的化学成分含量逐渐增大,地下水水质变差。针对平原区浅层孔隙地下水水化学环境变化趋势,基于大量水化学分析数据,从含水层岩性,地下水补给、径流、排泄以及人类活动等方面对其进行了分析研究,结果表明:包气带岩层对各种污染物(NO3^-除外)的净化能力大于90%,包气带介质层对重金属有很强的净化能力,而对Cl^-净化能力较弱;研究区河流对浅层地下水环境演化的控制作用主要表现在河水稀释(总硬度减小)以及水质污染(NH+4含量增大)。

In order to find out the changing tendency of chemical environment of the shallow pore ground water in the target area,based on the masses of experiments and monitoring data,the paper analyzed and studied controlling factors such as lithology of aquifers,ground water replenishment,runoff,discharge and human activities.The results show that 90 percent of variety of pollutants(except NO3^-)can be purified by lithology of the riverbed of Luohe River.The aeration zone is quite good in purifying heavy metals,while it is weaker in purifying Cl^-.Riv⁃ers within in the studied area control the evolution of shallow ground water mainly by dilution of water and water contamination.