兴城市典型海水入侵区水文地球化学特征  

Hydrogeochemical characteristics of typical seawater intrusion in Xingcheng City

作　　者：张耀文[1,2] 李海君 赵倩[3] 贾进军 王贺 ZHANG Yaowen;LI Haijun;ZHAO Qian;JIA Jinjun;WANG He(Institute of Disaster Prevention Science and Technology,Langfang 065201,China;Hebei Key Laboratory of Resource and Environmental Disaster Mechanism and Risk Monitoring,Langfang 065201,China;School of Earth Science and Engineering,Hohai University,Nanjing 210000,China;The 4th Hydrogeology Engineering Geological Team,Geology and Mineral Exploration and Development Bureau of Hebei Province,Cangzhou 061000,China)

机构地区：[1]防灾科技学院,廊坊065201 [2]河北省资源环境灾变机理及风险监控重点实验室,廊坊065201 [3]河海大学地球科学与工程学院,南京210000 [4]河北省地质矿产勘查开发局第四水文工程地质大队,沧州061000

出　　处：《海洋地质前沿》2024年第8期32-41,共10页Marine Geology Frontiers

基　　金：河北省教育厅科学研究项目(QN2024093,QN2022192);廊坊市科技局科学研究与发展计划自筹经费项目(2023013089);河北省高等教育教学改革研究与实践项目(2022GJJG487);防灾科技学院2022年校级教研教改项目(JY2022RC13)。

摘　　要：为了揭示兴城滨海平原区海水入侵过程中地下水化学成分演化规律和复杂的水文地球化学作用,在兴城河曹庄镇段至烟台河沙后所镇段内采集了44个地下水样本和1个海水样本,测定其水化学成分及氢氧同位素,通过分析其变化特征探讨兴城典型海水入侵区的水文地球化学特征及其形成作用。结果表明:①区内地下水化学场呈明显的水平分带性,水质由内陆到滨海依次为淡水、微咸水-咸水,地下淡水的水化学类型主要为HCO_(3)-Ca、HCO_(3)·Cl-Ca以及SO_(4)-Ca型等,微咸水及咸水的水化学类型主要为Cl-Na型或Cl-Ca型;②区内地下水主要由大气降水补给,地下淡水主要受控于溶滤作用,而微咸水因受到蒸发作用及混合作用影响,造成氧漂移;③微咸水以Cl^(−)组分为代表的海水与淡水混合比例为0.45%~3.46%,咸水的混合比例约为15.85%,微咸水、咸水的形成为混合作用、蒸发浓缩作用以及阳离子交替吸附作用等共同影响所致。To reveal the evolution of groundwater chemical composition and the complex hydrogeochemical in-teractions due to the seawater intrusion in Xingcheng coastal plain,Liaoning,NE China,44 groundwater samples and 1 seawater sample were collected from the Caozhuang Town section at Xingcheng River to Shahouzuo Town section at Yantai River.The chemical composition,and hydrogen and oxygen isotopes of the samples were de-termined.The hydrogeochemical characteristics and formation processes in typical seawater intrusion areas and their variations were analyzed.Results show that,the chemical field of groundwater in the area exhibited obvious horizontal zonation,and the water quality changed from freshwater to brackish water and to saline water success-ively from inland to coastal areas.The chemical types of groundwater were mainly HCO_(3)-Ca,HCO_(3)·Cl-Ca,and SO_(4)-Ca,while those of brackish water and salt water were mainly Cl-Na or Cl-Ca.Groundwater in the area was recharged by mainly atmospheric precipitation,with groundwater in the inland freshwater mainly controlled by dissolution and filtration processes,while brackish water was influenced by evaporation and mixing processes,leading to oxygen drift;The mixing ratio of seawater represented by Cl component with freshwater in brackish water ranges from 0.45%to 3.46%,while the mixing ratio of saline water was about 15.85%.The formation of brackish water and saline water was due to the combined effects of mixing,evaporation concentration,and cation exchange adsorption.

关 键 词：兴城滨海平原区 同位素特征 水化学类型 海水入侵 

分 类 号：P736[天文地球—海洋地质] P641[天文地球—海洋科学]