| 典型滨海平原区地下水流系统水化学场演化及成因:以杭嘉湖平原为例 |
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| 引用本文： | 黄金瓯,鲜阳,黎伟,张达政,庄晓明.典型滨海平原区地下水流系统水化学场演化及成因:以杭嘉湖平原为例[J].地球科学,2021,46(7):2565-2582. |
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| 作者姓名： | 黄金瓯 鲜阳 黎伟 张达政 庄晓明 |
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| 作者单位： | 浙江省地质环境监测中心,浙江杭州 310007;中国地质大学环境学院,湖北武汉 430078;中国地质大学环境学院,湖北武汉 430078;浙江省地质环境监测中心,浙江杭州 310007;嘉兴市地质环境监测站,浙江嘉兴 314001 |
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| 基金项目： | 中国地质调查局资助项目202018000000180606中国地质调查局资助项目202018000000181122中国地质大学（武汉）中央高校基本科研业务费专项资金资助项目1910491T05 |
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| 摘 要： | 滨海平原地区地下水流系统水化学场演化过程复杂，同时受古海侵咸化以及现代人类活动影响，当前对其专门分析的研究较少.以杭嘉湖平原为例，综合运用多元统计和水化学分析方法，对采集的78个深层孔隙承压水样品水化学数据进行解译.研究表明:区内水化学分区可划分为“古海侵区”、“径流排泄区”、“海水咸化区”，水化学类型依次为Na-Cl-HCO3型、Na-HCO3和Na-Ca-HCO3型、Na-Cl型.深层地下水化学成因包括“海水入侵和离子交换”、“天然矿物溶解”、“人类活动”.滨海平原区地下水流系统无明显级次划分，地下水化学场演化先后经历原生淡水形成、古海侵咸化、人为超采和现代海水入侵3个阶段，当前不同程度的“人类活动”已取代自然过程成为驱动区内地下水流系统、尤其是水化学场演化的主要因素.
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| 关 键 词： | 水化学演化 滨海平原 杭嘉湖平原 地下水 |
| 收稿时间： | 2020-08-04 |
Hydrogeochemical Evolution of Groundwater Flow System in the Typical Coastal Plain:A Case Study of Hangjiahu Plain |
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| Huang Jinou,Xian Yang,Li Wei,Zhang Dazheng,Zhuang Xiaoming.Hydrogeochemical Evolution of Groundwater Flow System in the Typical Coastal Plain:A Case Study of Hangjiahu Plain[J].Earth Science-Journal of China University of Geosciences,2021,46(7):2565-2582. |
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| Authors: | Huang Jinou Xian Yang Li Wei Zhang Dazheng Zhuang Xiaoming |
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| Abstract: | The hydrogeochemical evolution of groundwater flow system in the coastal plainis a complicated process which is influenced by both ancientseawater intrusion and modern anthropogenic activities. However, at present few of previous studies specially investigated on it.In this study, taking the Hangjiahu Plain as an example, the multivariate statistics and hydrochemical analysis methods are used to interpret the hydrochemical data of 78 water samples from deep confined aquifers. Results show that hydrogeochemicalzones of this typical coastal plain can be classified as the ancient seawater intrusionzone, salinized zone and runoff-discharge zone, with the hydrochemical type of Na-Cl-HCO3, Na-HCO3and Na-Ca-HCO3, and Na-Cl, respectively.The dominant factors of groundwaterhydrogeochemical evolution of this coastal plain were seawater invasion and ion exchange, natural rock dissolution and anthropogenic activities. No obvious groundwater flow system hierarchy was foundin the coastal plain. There is a typical pattern of hydrogeochemical evolutionoccurring. Such evolutionis constituted with the following three stages: (1) the formation stage of original fresh water, (2) the salinization stage by ancientseawater invasion, and (3) the modernseawater invasion stage induced by human over pumping. Moreover, anthropogenic activitieshave replaced natural progresses and become the dominant factor on coastal hydrogeochemical evolution. |
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