Mapping and monitoring seasonal and tidal effects on the salt-freshwater interface using electrical resistivity tomography techniques

Xu, Zulin; Tong, Jinnan; Hu, Bill X.; Zhao, Yan

doi:10.1016/j.ecss.2022.108051

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…After understanding the groundwater flow system, the fixed-point well monitoring method can monitor the long-sequence dynamic characteristics of seawater intrusion at specific points, which can analyze the effect and the response of dynamic groundwater changes on seawater intrusion. This also helps confirm how seawater intrusion is determined by the water chemical sampling analysis method [69]. Combined with the geophysical monitoring method, it can verify the accuracy of the scoping of seawater intrusion.…”

Section: Theoretical Implicationsmentioning

confidence: 88%

Analysis of the Seawater Intrusion Process Based on Multiple Monitoring Methods: Study in the Southern Coastal Plain of Laizhou Bay, China

Liu

Gao

et al. 2023

Water

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Affected by natural factors and human activities, seawater intrusion has become a geo-environmental problem, significantly impacting human production and life. Seawater intrusion weakens coastal areas’ geo-environmental carrying capacity, limiting industry and commerce development potential. On the other hand, it may provide convenient deep seawater resources for coastal aquaculture development. Therefore, how to quantitatively analyze seawater intrusion’s process, scope, and influencing factors has become a hotspot for hydrogeological researchers. This study uses chemical sampling analysis, environmental isotope, fixed-point, and geophysical methods to monitor long-term seawater intrusion in the southern coastal plain of Laizhou Bay. According to the monitoring data, the chemical type of fresh groundwater changes from Ca·Mg-HCO3 to Na-HCO3·Cl, Na·Ca-HCO3·Cl from south to north, and the changing trend of brackish groundwater is from Mg·Na·Ca-HCO3, Mg·Ca-HCO3 to Na-Cl·HCO3, Na·Mg-Cl. Saline groundwater is mainly of the Na-Cl and Na·Mg-Cl type. Brine is of the Cl-Na type. The relationship between 18O, 2H, and Cl− shows that groundwater was affected by evaporation, dissolution, and mixing in the runoff process. The relationship between water level and TDS in monitoring wells at different locations and depths confirms the existence of seasonal variations and layered intrusion phenomena in groundwater recharge sources. From July 2018 to December 2019, the south intrusion and north retreat rates were approximately 213.3 m/a and 105.9 m/a, respectively. From August 2016 to December 2019, the seawater intrusion front on the Dawangdong profile generally retreated northward at approximately 27 m/a. The results of this study can provide a scientific basis for the utilization of groundwater in local production and life. Comparative analysis and mutual verification of multiple monitoring methods can provide basic ideas for constructing a multi-source monitoring system for seawater intrusion.

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Section: Theoretical Implicationsmentioning

confidence: 88%

Analysis of the Seawater Intrusion Process Based on Multiple Monitoring Methods: Study in the Southern Coastal Plain of Laizhou Bay, China

Liu

Gao

et al. 2023

Water

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Unraveling microbial community variation along a salinity gradient and indicative significance to groundwater salinization in the coastal aquifer

Zhi,

Hu,

Yang

et al. 2024

Journal of Hydrology

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Effects of Fresh Groundwater and Seawater Mixing Proportions and Salt-Freshwater Displacement on Coastal Aquifer Microbial Communities

Chen,

Ma,

et al. 2024

Water

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Seawater intrusion significantly affects the microbial communities within coastal aquifers. Investigating the spatial distribution of groundwater microbial communities in coastal regions is crucial for understanding seawater intrusion. The primary objective of this study is to develop a novel microbial index-based method for detecting seawater intrusion. Groundwater microbial samples were collected and sent to the laboratory in the west coastal area of Longkou City, Shandong Province. By characterizing the microbial community within the whole interval of seawater intrusion into fresh groundwater and discussing the effects of salt-freshwater displacement intensities on groundwater microbial communities, including diversity, structure, and function, using indoor domestication experiments, we reveal the response of microorganisms to the seawater intrusion process under in situ environmental conditions. The results show that the microbial community diversity is highest in environments with a seawater mixing proportion (P(sm)) of 2.5% and lowest in those with a P(sm) of 75%. When considering species abundance and evolutionary processes, the microbial community structure is similar at higher P(sm) levels, while it is similar at lower P(sm) levels based on the presence or absence of species. Tenericutes, Flavobacteriia, Rhodobacterales, Flavobacteriales, Rhodobacteraceae, Flavobacteriaceae, Cohaesibacteraceae, and Cohaesibacter are significantly positively correlated with the P(sm). Strong salt-freshwater displacement enhanced the richness and evenness of the microbial community, whereas weak displacement showed the opposite trend. Strong displacement affects the functional profiles of the microbial community. This study effectively addressed the challenge of obtaining samples in coastal areas and also incorporated salt-freshwater displacement intensities, which can more comprehensively describe the microbial community characteristics within the groundwater of coastal aquifers.

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Mapping and monitoring seasonal and tidal effects on the salt-freshwater interface using electrical resistivity tomography techniques

Cited by 3 publications

References 49 publications

Analysis of the Seawater Intrusion Process Based on Multiple Monitoring Methods: Study in the Southern Coastal Plain of Laizhou Bay, China

Analysis of the Seawater Intrusion Process Based on Multiple Monitoring Methods: Study in the Southern Coastal Plain of Laizhou Bay, China

Unraveling microbial community variation along a salinity gradient and indicative significance to groundwater salinization in the coastal aquifer

Effects of Fresh Groundwater and Seawater Mixing Proportions and Salt-Freshwater Displacement on Coastal Aquifer Microbial Communities

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