Groundwater recharge sources analysis of coastal aquifer under the impact of cut-off walls: A case study of the Dagu River

被引:0
|
作者
Zhang, Bo [1 ]
Wu, Haoran [2 ]
Liu, Yang [2 ]
Li, Peihua [2 ]
Zheng, Zhihong [2 ]
机构
[1] Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Peoples R China
[2] Ocean Univ China, Coll Environm Sci & Engn, Qingdao 266100, Peoples R China
关键词
Coastal aquifer; Groundwater recharge; Cut-off walls; Seawater intrusion; M3-MIX; SEAWATER INTRUSION; LAIZHOU BAY; MANAGEMENT; PLAIN; CHINA;
D O I
10.1016/j.apgeochem.2025.106356
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Water quality degradation due to seawater intrusion is a globally significant environmental and geological issue. Cut-off walls, besides mitigating seawater intrusion, can alter groundwater flow direction and rate. Re-analysis recharge sources in coastal aquifers with cut-off walls is crucial for hydrogeological research and water resource management. Our study focused on the Lower Dagu River, where cut-off walls were installed. We employed the M3-MIX method to analyze groundwater recharge sources. The qualitative assessment revealed a substantial reduction in regional hydraulic connections across the cut-off walls, although weak seasonal connections persist due to groundwater level fluctuations and wall heights. Using M3-MIX, we identified four recharge sources in the south area-three salt groundwater sources and one saline surface water source-with mixing ratios of 1.4 %, 44.3 %, 41.8 %, and 12.5 %, respectively. In the north area, three recharge sources were identified-a river water sample, a saline surface water sample, and a groundwater sample-with mixing ratios of 14.9 %, 26.8 %, and 58.3 %, respectively. Our findings underscore the impact of cut-off walls on recharge sources and highlight the importance of re-analysis these sources for effective exploitation and protection of coastal aquifer water resources.
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页数:9
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