摘要
为了查明洋-戴河滨海平原地下水咸化的主要因素和海水入侵机理,本文采集了不同类型水样(河水、浅层淡水、微咸水、雨水、海水和深层水),通过对该地区不同水体的水化学特征、离子比、吉布斯图、氚氧同位素组成以及矿物相平衡状态进行分析,研究了洋-戴河滨海平原海水入侵区不同水体的水文地球化学作用过程。结果表明:洋-戴河滨海平原河水和浅层淡水的演化主要以岩土风化-溶滤作用为主,在此过程中也受到了蒸发浓缩作用的影响;微咸水的形成主要受浅层淡水与海水的混合作用和浅层淡水的蒸发浓缩作用控制;局地地下水咸化可能受到了深部地下热水的溢流补给(Q06水样),部分深层地下水也受到了海水混入(Q35水样);基于海水的混入比例和矿物饱和指数SI分析,揭示了浅层淡水与海水的混合作用过程中最高海水混入比例为4.35%,期间主要发生了Ca、Na离子交换;不同水体中,方解石、白云石基本处于饱和状态,石膏、无水石膏和岩盐均未达到饱和状态。
For the purpose of investigating the main factors of groundwater salinization and the mechanism of seawater intrusion in the coastal plain of Yang River and Dai River,this paper collets various water samples （river water, shallow groundwater, brackish water,rainwater, seawater and deep water） to analyze their characteristics of hydrochemistry and isotopes. On the basis of the analysis of the environment isotopes （8180-82H）, the characteristics of major hydrochemical composition, the ratios of major ions and gibbs plot, the research results suggest that rock weathering and evaporation are the dominant processes in the evolvement of river water and shallow groundwater;the brackish water is the result of the mixture of seawater and shallow fresh groundwater and is also affected by the evaporation of shallow groundwater, and some brackish samples are possibly affected by geothermal water,such as Q06; moreover, some deep groundwater may be also influenced by seawater, such as Q35. The integration of different hydrogeochemi- cal results （mix proportion and saturation index ） reveals that the highest mix proportion is 4.35 ~ and Ca- Na cation exchange should be the main hydrogeochemical reactions controlling the hydrogechemical evolu tion of brackish water. In all kinds of samples, calcite and dolomite are in the state of saturation while gyp- sum,anhydrite and halite represent the state of undersaturation.
出处
《安全与环境工程》
CAS
北大核心
2014年第2期32-39,共8页
Safety and Environmental Engineering
基金
中国地质调查局项目(1212010814004)
国家公益性行业科研专项项目(201011019)
关键词
海水入侵
水化学
环境同位素
地下水咸化
洋-戴河滨海平原
seawater intrusion
hydrochemistry
environment isotope
groundwater salinization
coastal plain of Yang aRiver and Dai River
