胶州湾北岸不同水体水化学及氢氧同位素特征研究

Hydrochemistry and Hydrogen and Oxygen Isotope Characteristics of Different Water Bodies in the North Coast of Jiaozhou Bay

研究不同水体的形成和运移过程,有助于合理开发利用水资源,对地表水与地下水污染协同防治和生态环境保护具有重要意义。以胶州湾北岸地区浅层地下水、河水及海水为研究对象,通过采集水化学和氢氧稳定同位素样品进行测试分析,综合运用统计学和Piper三线图,分析不同水体的水化学特征和影响因素,并结合氢氧稳定同位素特征研究其补给来源和转化关系。结果表明:研究区基岩裂隙水整体以淡水为主,部分点位受海水入侵影响,呈微咸水特征;第四系孔隙水整体为咸水且化学组分较稳定;河水水化学组分变化程度较大,呈微咸水-咸水特征。研究区地表水体间存在相互转化关系,祥茂河河水的主要来源为大气降水;洪江河、墨水河河水为大气降水与海水的混合水,且墨水河受海水混合影响程度大于洪江河;胶州湾海水为河水和标准海水的混合水。研究区地下水和地表水之间存在相互转化,基岩裂隙水来源除大气降水外,还与第四系孔隙水存在密切的水力联系,受海水入侵的影响;第四系孔隙水来源为大气降水与海水的混合水,径流过程中接受地表水体或基岩裂隙水的补给并经历不同程度的蒸发作用。

The study of the formation and migration of different water bodies is helpful to the rational development and utilization of water resources,and of great significance to the coordinated prevention and control of surface water and groundwater pollution and ecological environment protection.Taking the Jiaozhou Bay north shore shallow groundwater,river water and sea water as the research ob-ject,through the acquisition of water chemistry and hydrogen and oxygen stable isotope samples test and analysis,the statistics and Piper diagram were integrated used,different water bodies of water chemical characteristics and influencing factors were analyzed,and in combination with characteristics of hydrogen and the relationship between supply source and transformation was studied by oxygen stable isotopic.The results show that the fissure water of bedrock in the study area is mainly fresh water,and some points are affected by seawater intrusion,showing brackish water characteristics.Quaternary pore water is salt water and its chemical composition is stable.The chemical composition of the river water varies greatly,showing the characteristics of brackish water and salt water.There is a mutual transformation relationship between surface water bodies in the study area.The main source of water in Xiangmao River is atmospheric precipitation.Hongjiang River and Moshui River are mixed water of atmospheric precipitation and sea water,and Moshui River is more affected by sea water mixing than Hongjiang River.The seawater in Jiaozhou Bay is a mixture of river water and standard seawater.There is mutual transformation between groundwater and surface water in the study area.Besides atmospheric precipitation,there is a close hydraulic connection between bedrock fissure water and quaternary pore water,which is affected by seawater intrusion.Quaternary pore water is derived from the mixture of atmospheric precipitation and sea water,which is supplied by surface water or fis sure water in bedrock during runoff and experiences evaporation in different degrees.