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Rare earth elemental and Sr isotopic evidence for seawater intrusion event of the Songliao Basin 91 million years ago

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Petroleum Science 2023年第3期20卷 1347-1362页

作者： Yu-Ke Liu Hua-jian Wang Jin-You Zhang Zhen-Wu Liu Fa-Zi Chen Xiao-Mei Wang Shui-Chang Zhang He Liu Research Institute of Petroleum Exploration and Development Beijing100083China Key Laboratory of Petroleum Geochemistry China National Petroleum CorporationBeijing100083China Daqing Oil Field Company China National Petroleum CorporationDaqingHeilongjiang163000China School of Ocean Sciences China University of GeosciencesBejing100083China

Petrogenesis of lacustrine dolostone is closely related with paleo-lake water conditions.Here we report the high spatial-resolution petrographic and geochemical results of a lacustrine dolomite nodule from the Qingshankou Formation,the Songliao Basin.Sedimentary and elemental signatures confirm the protogenetic origin of this nodule and its effectiveness in recording geochemical characteristics of paleo-lake water during dolomitization.The low Y/Ho ratios,middle rare earth element(MREE)enrichment and subtle positive Eu anomalies within the nodule indicate a fresh water source.However,the Sr isotope values in the core of the nodule(0.7076-0.7080)are close to contemporaneous seawater(0.7074),yet different from the modern river(0.7120)and the host black shale(0.7100).On the premise of excluding the influence of hydrothermal fluids,the significantly low strontium isotope values of the lacustrine dolomite might be caused by seawater interference during dolomitization.Our findings demonstrate that lacustrine dolomite within black shales is not only a faithful tracer of diagenetic water environment,but also a novel and easily identified mineralogical evidence for episodic seawater intrusion event(91 Ma)in the Songliao Basin,which supplements other paleontological and geochemical evidence.

关键词： Songliao Basin Lacustrine dolostone seawater intrusion Rare earth elements Strontium isotope

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Solute transport and geochemical modeling of the coastal quaternary aquifer, Delta Dahab Basin, South Sinai, Egypt

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Acta Geochimica 2024年第1期43卷 16-39页

作者： Amira Samy Mustafa Eissa Seham Shahen Moustafa M.Said Rabab M.Abou-shahaba Division of Water Resources and Arid Land Department of HydrogeochemistryDesert Research CenterCairoEgypt Egypt Desalination Research Center of Excellence Desert Research CenterCairoEgypt Center for Water Supply Studies S&E-Physical&Environmental SciencesTexas A&M University Corpus ChristiCorpus ChristiUSA Department of Chemistry Faculty of Science(Girls)Al-Azhar UniversityYousef Abbas StrNasr CityP.O.Box:11754CairoEgypt

The wadi dahab delta is in a dry, arid coastal zone within Egypt’s south Sinai Peninsula’s eastern portion. The primary water source is the Quaternary coastal alluvial aquifer. The groundwater salinity varies from 890to 8213 mg/L, with a mean value of 3417 mg/L. The dissolved major ions have been used to calculate the seawater mixing index(SWMI) using a linear equation that discriminates the groundwater mostly affected by water–rock interaction(SWMI 1>) and other samples mixed with seawater(SWMI seawater represented by a Red Sea water sample(δ^(18)O + 1.64‰-δ^(2)H + 9.80‰) and reject brine water are considerably enriched the isotopic groundwater values. The geochemical NETPATH model constrained by the dissolved significant ions, isotopes, and the rock aquifer forming minerals as phases indicate the mixing percent with the seawater ranges from 9% to 97% of seawater from 91% to 3% of original recharge water. According to the SEAWAT 3-D flow models, seawater has penetrated the Northeastern Dahab delta aquifer, with the intrusion zone extending1500 m inland. The salt dissolution, upwelling of saline water, recharge from the upstream mountain block, and seawater encroachment are the primary aspects contributing to the deterioration of groundwater quality. These findings may have significance for effective groundwater withdrawal management in arid locations worldwide with similar hydrogeological systems.

关键词： Groundwater geochemistry seawater intrusion Solute transport SEAWAT

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seawater intrusion in the Longkou-Laizhou Area, Shandong

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Acta Geologica Sinica(English Edition) 1993年第1期67卷 107-120页

作者： Xue Yuqun, Xie Chunhong, Wu Jichun, Nanjing University Liu Peimin, Wang Jianji, Jiang Qingbo Office of Water Resources of Longkou City Shi Hongwen and Ning Pihai Office of Water Resources of Laizhou City Liu Linqun Nanjing University China

The extensive intrusion （covering an area of 83.7-238.3 km;and accounting for 18.6-31.5% of the total area of the plain）, the presence of a transitional zone 1.5-6.0 km in width, and the interconnection in distribution between the seawater intrusion district and the region lower than the sea level caused by the strong drop of the groundwater level are major characteristics of the seawater intrusion in the study area. Cation exchange played an important role during the formation of chemical composition of the groundwater in the seawater intrusion district.

关键词： seawater intrusion fresh water-saline water interface transitional zone cation exchange the area with negative groundwater level Longkou-Laizhou area of Shandong

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PREDICTING THE CONSEQUENCES OF seawater intrusion AND PROTECTION PROJECTS

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Applied Mathematics and Mechanics(English Edition) 2001年第11期22卷 1291-1300页

作者：袁益让梁栋芮洪兴 Institute of Mathematics Shandong University Jinan P R China

The simulation of this process and the effects of protection projects lays the foundation of its effective control and defence. The mathematical model of the problem and upwind splitting alternating direction method were presented. Using this method, the numerical simulation of seawater intrusion in Laizhou Bay Area of Shandong Provivce was finished. The numerical results turned out to be identical with the real measurements, so the prediction of the consequences of protection projectects is reasonable.

关键词： seawater intrusion predictive simulation numerical simulation splitting algorithm upwind scheme

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The modified method of upwind with finite difference fractional steps procedure for the numerical simulation and analysis of seawater intrusion

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Progress in Natural Science:Materials International 2006年第11期16卷 1127-1140页

作者： * YUAN Yirang**, LIANG Dong and RUI Hongxing(Institute of Mathematics, Shandong University,Jinan 250100, China) Institute of Mathematics Shandong University Jinan 250100 China

Numerical simulation and analysis of seawater intrusion is the mathematical basis for modern environmental science. Its mathematical model is the nonlinear coupled system of partial differential equations with initial-boundary problems. For a generic case of a three-dimensional bounded region, the modified method of upwind with finite difference fractional steps procedure is put forward. Optimal order estimates in L~~2 norm are derived for the error in the approximation solution. The present method has been successfully used in predicting the consequences of seawater intrusion and protection projects.

关键词： seawater intrusion three-dimensional region upwind fractional steps L~~2 norm estimate.

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Research and Application of High-Density Resistivity Method in seawater intrusion Investigation in Laizhou Bay

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Agricultural Biotechnology 2023年第6期12卷 88-92页

作者： Yuhai HE Hongjin WANG Zengcai ZHAO Biao WANG Bin ZHANG Xiaodan WANG Shandong Institute of Geophysical and Geochemical Exploration Jinan 250013China Shandong Engineering and Technology Research Center of Geological Exploration Jinan 250013China Shandong Institute of Geological Surveying Jinan 250014China Shandong Engineering Research Center for Geochemistry and Pollution Prevention and Control of Land Quality Jinan 250014China

The disaster of seawater intrusion seriously affects people's lives and restricts economic development,so the detection and treatment of seawater intrusion is a long-term task.On the basis of field investigation and water quality analysis,according to the change characteristics of apparent resistivity of groundwater after Cl-reaches 250 mg/L,the theoretical basis for the application of high-density resistivity method was determined,and the characteristic values of apparent resistivity for seawater intrusion interfaces in different geological characteristic regions in Laizhou Bay area were determined by typical profile tests.Combined with water quality investigation and other means,profiles for the high-density resistivity method were arranged,and the interfaces between saline and fresh water were accurately divided.

关键词： High-density resistivity method seawater intrusion Laizhou Bay Characteristic value

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CHARACTERISTICS-FINITE ELEMENT METHODS FOR seawater intrusion NUMERICAL SIMULATION AND THEORETICAL ANALYSIS

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Acta Mathematicae Applicatae Sinica 1998年第1期14卷 11-23页

作者：袁益让梁栋芮洪兴 Institute of Mathematics Shandong University Jinan China

Both numerical simulation and theoretical analysis of seawater intrusion in coastal regions are of great theoretical importance in environmental sciences. The mathematical model can be described as a problem of the initial boundary values for a system of 3-dimensional nonlinear parabolic partial differential equations, one being the pressure flow equation and the other is the concentration convection-dispersion equation of the salt contained. For a generic case of a 3-dimensional bounded region, a backward-difference time-stepping scheme is defined. It approximates the pressure by the standard Galerkin procedure and the concentration by a Galerkin method of charederistics, where calculus of variations, theory of prior estimates and techniques are made use of Optimal order estimates in H1 norm are derived for the errors in the approximate solution.

关键词： seawater intrusion 3-dimensional problem characteristics-finite element,optimal order H1 estimates

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State of seawater intrusion and its adaptive management countermeasures in Longkou City of China

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Journal of Groundwater Science and Engineering 2020年第1期8卷 30-42页

作者： ZHONG Hua-ping WU Yong-xiang Nanjing Hydraulic Research Institute

Longkou City is a coastal area,and lacks water resources.The overexploitation of groundwater causes seawater intrusion.At present,seawater intrudes an area of 68 km2.With the decrease of groundwater extraction,the seawater intrusion area has generally declined.The paper expounds the development process of seawater intrusion as well as the corresponding prevention and control measures of using groundwater replenishment and groundwater throttling in Longkou City.In view of the seawater intrusion problem in Longkou City,some adaptive management countermeasures are put forward,which include:Adjusting industrial and agricultural structure,promoting economic and social development to match water resources;improving water usage structure,optimizing the utilization of water resources;advancing the construction of a water-saving society,using water resources efficiently;implementing inter-basin water transfer,using water resources rationally;developing and utilizing unconventional water sources,making full use of water resources;strengthening water infrastructure construction,increasing the development and utilization potential of water resources;carrying out ecological restoration,protecting water resources and ecological environment;improving the management informationalization level,strengthening the capabilities of groundwater monitoring and management;increasing publicity,improving public awareness of participation.

关键词： seawater intrusion Groundwater Adaptive management Countermeasures Longkou City

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The Alternating-Direction Schemes and Numerical Analysis for the Three-dimensional seawater intrusion Simulation

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Acta Mathematicae Applicatae Sinica 2002年第3期18卷 389-404页

作者： Zhi-yue ZhangLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China & School of Mathematics and Computer Science, Nanjing Normal University, Nanjing 210097, China LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China School of Mathematics and Computer Science Nanjing Normal University Nanjing China

Both numerical simulation and theoretical analysis of seawater intrusion in coastal regions are of great theoretical importance in environmental sciences. The mathematical model can be described as a coupled system of three dimensional nonlinear partial differential equations with initial-boundary value problems. In this paper, according to the actual conditions of molecular and three-dimensional characteristic of the problem, we construct the characteristic finite element alternating-direction schemes which can be divided into three continuous one-dimensional problems. By making use of tensor product algorithm, and priori estimation theory and techniques, the optimal order estimates in H1 norm are derived for the error in the approximate solution.

关键词： Three-dimensional seawater intrusion characteristic finite element alternating-direction optimal order estimate in H^1

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Characteristics and genesis of groundwater salinization in coastal areas of the Lower Reaches of Oujiang Basin

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Journal of Groundwater Science and Engineering 2024年第2期12卷 190-204页

作者： Mei-hui Zhang Shi-yang Zhou Dan-dan Liu Ying Zhang Yu-xi Zhang Xi Chen Hui-wei Wang Bei Li Wei Kang Bing Yi Wan-peng Shi Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Fujian Provincial Key Laboratory of Water Cycling and Eco–Geological Processes Xiamen 361021FujianChina China University of Geosciences(Beijing) Beijing 100083China Changsha Center of Natural Resources Comprehensive Survey China Geological SurveyChangsha 410600China Hydrogeological Environmental Geological Survey Center of China Geological Survey Tianjin 071501China China University of Geosciences Wuhan 430074China

The coastal areas of the lower reaches of Oujiang River Basin are rich in groundwater resources.However,the unsustainable exploitation and utilization of groundwater have led to significant changes in the groundwater environment.Understanding the characteristics and genesis of groundwater salinization is crucial for preventing its deterioration and ensuring sustainable utilization.In this study,a comprehensive approach combining the ion ratio method,mineral saturation index method and multivariate statistical analysis was employed to investigate the hydrochemical characteristics and main controlling factors in the study area.The findings reveal that:(1)Groundwater samples in study area exhibit a neutral to slightly alkaline pH.The predominant chemical types of unconfined water are HCO_(3)-Ca·Na,HCO_(3)·Cl-Na·Ca and HCO_(3)·SO_(4)-Ca·Na,while confined water mainly exhibits Cl·HCO_(3)-Na and Cl-Na types.(2)Salinity coefficients indicate an increase in salinity from unconfined to confined water.TDS,Na^(+)and Cl^(–)concentrations show an increasing trend from mountainous to coastal areas in unconfined water,while confined water displays variability in TDS,Na^(+)and Cl^(–)concentrations.(3)Groundwater salinity is mainly influenced by water-rock interactions,including the dissolution of halite and gypsum,cation exchange,and seawater intrusion etc.Additionally,human activities and carbonate dissolution contribute to salinity in unconfined water.seawater intrusion is identified as the primary factor leading to higher salinity in confined water compared to unconfined water,with increasing cation exchange and seawater interaction observed from unconfined to confined water.

关键词： Hydrochemical Multivariate statistical analysis seawater intrusion

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