Effect of cut-off walls on submarine groundwater discharge in non-isothermal conditions

ZHENG Tianyuan; XIN Xiao; WANG He; GAO Shaobo; LIU Lecheng; ZHANG Bo; ZHENG Xilai; LUO Jian

doi:10.16030/j.cnki.issn.1000-3665.202408027

2025 Vol. 52, No. 1

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ZHENG Tianyuan, XIN Xiao, WANG He, GAO Shaobo, LIU Lecheng, ZHANG Bo, ZHENG Xilai, LUO Jian. Effect of cut-off walls on submarine groundwater discharge in non-isothermal conditions[J]. Hydrogeology & Engineering Geology, 2025, 52(1): 1-11. doi: 10.16030/j.cnki.issn.1000-3665.202408027

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ZHENG Tianyuan, XIN Xiao, WANG He, GAO Shaobo, LIU Lecheng, ZHANG Bo, ZHENG Xilai, LUO Jian. Effect of cut-off walls on submarine groundwater discharge in non-isothermal conditions[J]. Hydrogeology & Engineering Geology, 2025, 52(1): 1-11. doi: 10.16030/j.cnki.issn.1000-3665.202408027

Effect of cut-off walls on submarine groundwater discharge in non-isothermal conditions

1.
College of Environmental Science and Engineering, Ocean University of China, Qingdao, Shandong　266100, China
2.
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao, Shandong　266100, China
3.
Sanya Ocean Institute, Ocean University of China, Sanya, Hainan　572000, China
4.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong　266590, China
5.
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA　30332, USA

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Author Bio: 郑天元，中国海洋大学环境科学与工程学院教授，博士生导师，国家优秀青年科学基金获得者，山东省“泰山学者”青年专家，山东省高等学校青年创新团队带头人。现任美国地球物理学会（AGU）地下水专业委员会委员， Journal of Hydrology副主编，国际水文科学协会中国地下水分委员会委员。　　长期致力于滨海水文地质的前沿科学问题研究，开发了知名多场耦合多相流数值模拟软件OpenGeoSys的多个渗流计算模块，提出了积分模型耦合全尺寸模型的高效多相流模拟算法，拓展了滨海地下水源地硝酸盐污染的解析方法，揭示了海水入侵防控的水盐动力机理和咸水净化周期，阐明了滨海地下水氮素迁移-转化新机制。主持国家自然科学基金青年项目、面上项目和中国海洋大学优秀青年科技人才培育项目，2024年获批国家自然科学基金优秀青年科学基金项目，作为学术骨干参加国家自然科学基金重点项目和基金委-山东省联合基金重点项目。以第一/通讯作者在Water Resources Research、Water Research、Advances in Water Resources、Journal of Hydrology等期刊发表SCI论文30余篇，授权国家发明专利5项、软件著作权7项，参与出版英文专著2部，负责再版全国统编教材《地下水污染控制》。获2021年山东省科学技术进步二等奖（3/9）、2022年山东省海洋科技创新二等奖（1/7）、2023年齐鲁水利科学技术一等奖（1/9）。受邀担任国际水文地质大会、国际计算水资源大会等重要国际会议专题召集人

Received Date: 21 August 2024

Revised Date: 24 September 2024

Publish Date: 15 January 2025

Abstract

Abstract

Temperature could change the migration characteristics of coastal groundwater. However, research on groundwater discharge processes under the influences of cut-off walls has been limited to isothermal conditions. This study built a two-dimensional numerical model coupling groundwater flow and salt transport in non-isothermal conditions at the site scale to investigate the impact of cut-off walls on groundwater discharge processes, considering the thermal effect. We focused on the dynamic characteristics of submarine groundwater discharge in non-isothermal conditions which are common in reality. This research quantitatively assessed the influence of seawater temperature on groundwater discharge flux (Q) and relative discharge flux (Q'). The results indicate that, under high-temperature seawater conditions, the timescale for Q' to reach equilibrium is significantly reduced. Specifically, higher freshwater temperatures and lower seawater temperatures could result in a greater Q'. However, when the seawater temperature exceeded the groundwater temperature by 15°C, reverse circulation is more likely to develop in the saltwater zone, which accelerates groundwater circulation and increases the total groundwater discharge into the sea, resulting in a corresponding rise in the Q' value. This study is significant for cut-off wall structure optimization and coastal groundwater sustainable utilization.
- seawater intrusion /
- thermal effect /
- coastal aquifer /
- numerical simulation

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References

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