江汉平原东部地区浅层地下水水化学特征

发布时间：2018-09-11 21:35

【摘要】：浅层地下水是江汉平原东部地区重要的供水水源,但面临着污染及天然水质异常等问题.基于水化学与氢氧同位素结果,并运用数理统计和因子分析等方法,查明了研究区浅层地下水的化学特征、控制过程以及影响因素.结果显示,浅层地下水的化学类型主要为HCO_3-Ca型;其中潜水中Ca~(2+)和Mg~(2+)含量与承压水接近,Fe、As和NH_4~+含量低于承压水,而Cl~-、SO_4~(2-)、Mn和NO_3~-含量高于承压水.浅层地下水主要为大气降水补给,其中潜水经历了一定程度的蒸发以及与地表水的混合.在影响浅层地下水化学特征的因素中,地质成因在总体上可能起主导作用;人类活动的输入显著地改变着潜水的化学特征,而浅层承压水则主要受径流过程中水-岩相互作用的影响.
[Abstract]:Shallow groundwater is an important water source in the eastern part of Jianghan Plain, but it is confronted with pollution and abnormal natural water quality. Based on the results of hydrochemistry and hydrogen and oxygen isotopes, the chemical characteristics, control process and influencing factors of shallow groundwater in the study area were investigated by means of mathematical statistics and factor analysis. The results show that the chemical types of shallow groundwater are mainly HCO_3-Ca type, in which the contents of Ca~ (2) and Mg~ (2) are lower than those of confined water, and the contents of Cl~-,SO_4~ (2-) mn and NO_3~- are higher than those of confined water. Shallow groundwater is mainly recharged by atmospheric precipitation, in which phreatic water experienced evaporation and mixing with surface water. Among the factors affecting the chemical characteristics of shallow groundwater, the geological origin may play a leading role in general, and the input of human activities has significantly changed the chemical characteristics of diving. Shallow confined water is mainly affected by water-rock interaction during runoff.
【作者单位】：中国地质大学生物地质与环境地质国家重点实验室;中国地质大学环境学院;中国地质大学地质调查研究院;
【基金】：中国地质调查局项目(No.12120114069301) 国家自然科学基金项目(No.41372252) 国家水体污染控制与治理科技重大专项子课题(No.2012ZX07204-003-04)
【分类号】：P641.3

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