山东北部泥质海岸带白浪河地区地下水水化学演化过程  

Hydrochemical evolution of groundwater in the Bailang River area of the muddy coastal zone,northern Shandong,China

作　　者：常新月 高茂生[1] 罗锡明[2] 孙启明 刘震林 侯国华[1] CHANG Xinyue;GAO Maosheng;LUO Ximing;SUN Qiming;LIU Zhenlin;HOU Guohua(Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,China;College of Marine Science and Technology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质调查局青岛海洋地质研究所,青岛266237 [2]中国地质大学(北京)海洋学院,北京100083

出　　处：《海洋地质前沿》2024年第3期64-74,共11页Marine Geology Frontiers

基　　金：国家自然科学基金(U2106203;41977173)。

摘　　要：莱州湾沿岸是中国海(咸)水入侵典型区域之一,受多次海侵海退事件影响,形成了复杂的地下含水系统。为探究其地下水系统水化学特征及演化规律,对比分析白浪河地区内地下水的水化学特征及主要离子的变化规律,研究了不同分区的水化学演化过程。结果表明,内陆的咸水主要由淡水/卤水混合形成,滨海的咸水主要由淡水/海水混合形成。现存卤水在形成过程中发生了淡水的混入,水岩相互作用和阳离子交换在一定程度上改变了卤水的水化学组成。矿物饱和指数结果表明,不同分区的地下水体中,方解石和白云石基本处于饱和状态,岩盐均未达到饱和状态,石膏仅在卤水中达到饱和状态。从陆到海,地下水系统中发生的阳离子交换过程不同,淡水区和微咸水区浅层的地下水主要是水中的Ca^(2+)与含水介质吸附的Na^(+)交换,而其他分区的阳离子交换过程与之相反。The coastal area of Laizhou Bay is one of the typical regions affected by sea(saline)water intrusion in China,and the intrusion has resulted in the formation of a complex groundwater system under the influence of multiple transgression and regression events.The hydrochemical characteristics and evolution of the groundwater system in the Bailang River basin,a tributary of the Laizhou Bay,was investigated,the hydrochemical characteristics and distribution patterns of groundwater from inland to the sea were comprehensively analyzed,the hydrochemical evolution process within the Bailang River basin was explored.Results indicate that inland saline water is formed primarily by the mixing of fresh water and brine,while seaward saline water is predominantly formed by the mixing of fresh water and seawater.During the brine formation process,the fresh water mixing,water-rock interaction,and cation exchange jointly altered the hydrochemical composition of brine.In addition,the mineral saturation index show that calcite and dolomite are near or at saturation level,while halite remains in an unsaturated state.From land to sea,different cation exchange processes occur in the groundwater system.In shallow freshwater and brackish water areas,Ca^(2+) is exchanged with Na^(+)adsorbed by aquifer media,while in other regions,the cation exchange processes is opposite.

关 键 词：白浪河 演化过程 卤水 矿物饱和指数 

分 类 号：P736[天文地球—海洋地质] P641[天文地球—海洋科学]