Seawater intrusion mechanism in coastal aquifer with horizontal double fractures based on discrete fracture matrix model

被引：0
|
作者：
Xie Y. [1 ,2 ]
Zeng Y. [1 ,2 ]
Yang J. [1 ,2 ]
Ye Y. [1 ,2 ]
Wu J. [3 ]
Lu C. [1 ,4 ]
机构：
[1] The National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing
[2] College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing
[3] School of Earth Sciences and Engineering, Nanjing University, Nanjing
[4] Yangtze Institute for Conservation and Development, Nanjing
来源：
Shuikexue Jinzhan/Advances in Water Science | 2023年 / 34卷 / 03期
基金：
中国国家自然科学基金;
关键词：
groundwater dynamics; horizontal double fractures; laboratory experiment; numerical simulation; seawater intrusion;
D O I：
10.14042/j.cnki.32.1309.2023.03.012
中图分类号：
学科分类号：
摘要：
Exploring the seawater intrusion mechanism in coastal aquifer with horizontal double fractures is critical for understanding the seawater intrusion mechanism in coastal region. Sand- tank experiments and numerical simulation based on discrete fracture matrix model were performed. The effects of horizontal double fractures with different spatial distribution on the seawater intrusion were analyzed in terms of the saltwater wedge and mixing zone. Results showed that: ① The development of saltwater wedge and mixing zone can be enhanced significantly by the horizontal double fractures. The seawater- freshwater mixing between the fractures is more pronounced. The individual effects of the two fractures are limited to each other. The effects are more significant for the fracture that is horizontally close to the offshore and vertically more close to the middle of the aquifer. ② A higher offshore- side fracture can exacerbate the development of the saltwater wedge and the mixing between fractures. However, the height of land- side fracture has a significant influence only on the tail of the saltwater wedge. ③ When the upper or lower fracture is horizontally closer to the inland, the saltwater wedge becomes wider with the total volume being shrank. However, once they are distributed so far to the inland that being out of the range of the saltwater wedge, the mixing zone area and the width of the saltwater wedge can drop sharply. © 2023 China Water Power Press. All rights reserved.
引用
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页码：454 / 464
页数：10
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