天津平原地下水水化学特征与碳酸盐风化碳汇特征的时空演变  

Hydrochemical characteristics of groundwater and spatio-temporal evolution of carbonate weathered carbon sink in Tianjin Plain

作　　者：张博深 李海明[1,2] 苏思慧 李梦娣 张翠霞 ZHANG Boshen;LI Haiming;SU Sihui;LI Mengdi;ZHANG Cuixia(Coastal Groundwater Uilzation and Protection Laboratoy,Tianjin Universityof Science and Technology,Tianjin 300457,China;School of Oceanography and Environment,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学滨海地下水利用与保护实验室,天津300457 [2]天津科技大学海洋与环境学院,天津300457

出　　处：《南水北调与水利科技（中英文）》2024年第5期1016-1028,共13页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(42072288)。

摘　　要：为研究天津平原地下水的水化学特征和碳酸盐风化碳汇特征的时空演变,在研究区内利用2020-2022年的采样数据分别进行ArcGIS反距离权重空间演化分析、聚类分析以及SPSS数据统计分析等工作。研究表明:在时空演化特征方面,2020-2022年Na^(+)和Cl^(-)的质量浓度呈现逐年增加趋势,地下水中的咸水含量逐渐增加,其中在116°63′E~116°84′E、117°12′E~117°47′E最为显著,Ca~(2+)+Mg^(2+)与HCO_(3)^(-)+SO_(4)^(2-)的质量浓度比值均大于1,天津平原地下水的咸水Ca^(2+)+Mg^(2+)与HCO_(3)^(-)+SO_(4)^(2-)的毫克当量浓度比值均小于1;在天津平原地下水阴阳离子的空间分布中,地下水中的阳离子Na^(+)、Ca^(2+)的质量浓度区间分别为[104.00,4 812.21]mg/L、[38.30,713.67]mg/L,阴离子Cl^(-)、HCO_(3)^(-)的质量浓度区间分别为[73.60,11 282.49]mg/L、[78.00,539.46]mg/L;在海咸水入侵的影响方面,通过对比和分析地下水中的Cl^(-)和其他离子(Na^(+)、Ca^(2+))质量浓度比例发现,靠近滨海区域,地下水的咸化程度较高,进一步实证分析发现海水入侵对地下水化学组成有显著影响(Δ[Na^(+)]=4 708.21 mg/L,Δ[Cl^(-)]=11 208.89 mg/L);在碳酸盐风化碳汇特征分析方面,天津平原西部地区的地下水碳酸盐风化碳汇量减少,而东部地区的地下水碳酸盐风化碳汇量增加,其中Ca^(2+)、Mg^(2+)的质量浓度对碳酸盐风化碳汇具有显著的正向影响(B[Ca^(2+)]=0.910,P=0.03;B[Mg^(2+)]=0.312,P=0.09)。Currently,owing to the significant impact of carbonate weathering processes,the chemical composition of groundwater in the Tianjin Plain exhibits a distinct horizontal zonation pattern,both from north to south and from north to east.This zonation is a result of complex geological and hydrogeological interactions that shape the unique characteristics of the groundwater in this region.The pH value of the groundwater typically ranges between 7.0 and 8.5,classifying it as neutral to slightly alkaline.This pH range is influenced by various factors,including the mineralogy of the aquifer materials and the presence of dissolved ions.One notable feature of the groundwater in the Tianjin Plain is its high total dissolved solids(TDS)content.This elevated TDS level is primarily attributed to the abundance of specific ions,notably sodium(Na^(+)),chloride(Cl^(-)),bicarbonate(HCO_(3)^(-)),and calcium(Ca^(2+))ions.In order to study the hydrochemical characteristics of groundwater in Tianjin Plain and the spatial and temporal evolution characteristics of carbonate weathered carbon sinks,ArcGIS antidistance weight spatial evolution analysis,cluster analysis and SPSS data statistical analysis were conducted by the sampling data from 2020 to 2022 in the research area.It is found that in terms of spatial and temporal evolution characteristics,the mass concentration of Na+and Clincreased gradually from 2020 to 2022,and the content of salt water in the groundwater between 116°63′E-116°84′E、117°12′E-117°47′E,Ca^(2+)+Mg^(2+)to HCO_3^(-)+SO_(4)^(2-)was greater than 1,and the ratio of Ca^(2+)+Mg^(2+)toHCO_(3)^(-)+SO_(4)^(2-)was less than 1.In the latitudinal spatial distribution of ions in Tianjin Plain,the mass concentration interval of cations Na+and Ca^(2+)in groundwater is[104 mg/L,4812.21 mg/L],Ca^(2+)[38.3 mg/L,713.67 mg/L],and the mass concentration interval of anions Cl^(-)and HCO_(3)^(-)is[73.6 mg/L,11282.49 mg/L],[78 mg/L,539.46 mg/L],respectively.In terms of the influence of salinity water intrusion,by comparing a

关 键 词：天津平原 地下水 水化学特征 碳酸盐风化 

分 类 号：TV211[水利工程—水文学及水资源]