Hydrogeochemical evolution characteristics of Baotu Spring in Jinan City, based on long-term monitoring
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摘要: 为了做好泉水保护工作,文章基于济南趵突泉60多年水文地球化学监测数据,动态分析趵突泉水文地球化学演化规律。结果显示:济南趵突泉水中${\rm{HCO}}_3^{-}$、Ca2+分别为阴、阳离子优势离子,${\rm{SO}}_4^{2-}$、Cl−、Na++K+等占比逐渐增加,水化学类型以HCO3-Ca型为主,且呈现多元化、复杂化趋势;趵突泉水化学组分主要来源于水−岩作用,主要受碳酸盐岩和硅酸盐岩矿物风化溶解的共同作用,且呈现出向硅酸盐岩风化溶解偏移的趋势,Cl−存在除岩盐矿物溶解外的其他来源并逐年增加,石膏溶解作用产生的Ca2+、${\rm{SO}}_4^{2-}$浓度逐渐增加,指示了石膏溶解作用在不断增强。氯碱指数反映了趵突泉水存在反向阳离子交换作用,且枯水期较丰水期强。矿物饱和指数指示了趵突泉总体处于过饱和状态,且总体上丰水期较枯水期、平水期偏高。研究表明,济南趵突泉水文地球化学特征主要受水−岩作用控制,农业活动、生活污水和人工补源等人类活动因素在不同历史时期对趵突泉水化学组分产生影响。Abstract:
Baotu Spring in Jinan City is of great significance in the fields of ecological regulation, history and culture, tourism economy, etc.; therefore, it is urgent to study its hydrogeochemical evolution characteristics and genesis mechanism, so as to provide a scientific basis for the high-quality protection of Baotu Spring. Based on the long-term hydrogeochemical monitoring data of Baotu Spring, its water chemical dynamic characteristics as well as its hydrogeochemical evolution over past 60 years have been analyzed in this study. The results show that the chemical composition of Baotu Spring presented a significant regularity from 1958 to 2022. The average contents of main ions in Baotu spring were ${\rm{HCO}}_3^{-}$, Ca2+, ${\rm{SO}}_4^{2-}$, Cl−, ${\rm{NO}}_3^{-}$, Na+, Mg2+ and K+ in a descending order, among which ${\rm{HCO}}_3^{-}$ and Ca2+ were the dominant ions of anion and cation in spring water. The variation coefficients of ${\rm{SO}}_4^{2-}$ and Na+ contents were relatively large, indicating the varieties of groundwater environment in different periods. The variation coefficients of ${\rm{HCO}}_3^{-}$, Ca2+ and Mg2+ contents were relatively small, showing that the source of related ions was stable. The specific gravity of ${\rm{SO}}_4^{2-}$, Cl−, and Na++K+ gradually increased, and the hydrochemical type evolved from HCO3-Ca to HCO3·SO4-Ca. In recent years, the hydrochemical type has shown the HCO3·SO4-Ca·Na type in several periods, indicating that the water chemical components of Baotu Spring are increasingly complex and diversified. The water chemical components of Baotu Spring in the Gibbs chart showed a trend of upward shift to the right, indicating that this spring was mainly controlled by water-rock interaction, and was increasingly influenced by other factors such as human activities. The ion ratio method indicates that the mineral weathering dissolution of Baotu Spring shifts from carbonate rock to silicate rock, and the ratio of (K++Na+)/Cl− is generally below and gradually away from the line of 1∶1, indicating that there are other sources of Cl− different from those of Na+, and the sources have increased year by year. The contents of Ca2+ and ${\rm{HCO}}_3^{-}$ ions in Baotu Spring show a gradual increasing trend, which indicates that the dissolution of carbonate rock has increased gradually. In addition, the Chlor-alkali index (CAI) shows that the water-rock interaction in Baotu Spring is dominated by the dissolution of carbonate rock, while the dissolution of gypsum and silicate rock plays a secondary role, but has gradually increased, indicating that the spring recharge area in the southern part of the gypsum and silicate rock stratum has a stronger recharge effect on groundwater runoff in Baotu Spring. The cation exchange in Baotu Spring is weak on the whole, but it has gradually increased over the years, and the cation exchange is stronger in the dry season than the wet season. The mineral saturation index of Baotu Spring is in a supersaturation state as a whole, and its dispersion becomes larger with the passage of time. Over the years, the mineral saturation index of Baotu Spring during the wet season has been generally higher than that during the dry season and normal season, but the performance is various in different periods. From 1950s to 1980s, the mineral saturation index of Baotu Spring during the wet season was lower than that during the dry season, and the mineral saturation index of Baotu Spring during the wet season was higher than that during the dry season after 1990s, indicating that with the increase of human activities in different historical periods, the source of groundwater and the water-rock interaction changed in dry and wet seasons. The contents of ${\rm{NO}}_3^{-}$/Cl− and Cl− increased first and then decreased under the influence of agricultural activities and domestic sewage discharge. In 1950s–1960s, the contents were greatly influenced by agricultural activities. Since 2000s, with the continuous improvement of spring protection and ecological environment, agricultural activities have gradually weakened the effect, while the influence caused by emission of domestic sewage and other human activities have been strengthened by degrees. Due to the influence of other human activities other than gypsum dissolution, the contents of ${\rm{SO}}_4^{2-}$ have increased gradually since 2010s. In summary, in the quasi-natural state from 1950s to 1960s, the contents of chemical components of Baotu Spring were relatively low. From 1970s to 1980s, the contents were increasingly influenced by agricultural activities, industrial and mining activities and domestic sewage discharge. From 1990s to 2000s, the contents of ${\rm{NO}}_3^{-}$, Cl− and ${\rm{SO}}_4^{2-}$ gradually increased under the comprehensive influence of human activities such as agricultural pollution in the recharge area, industrial and mining activities, domestic waste landfill, etc. Since 2010, the pollution of industrial and mining enterprises and domestic life has alleviated, and the protection measures of Baotu Spring such as ecological groundwater recharge have become normal. The contents of Ca2+ and Mg2+ in non-carbonate karst hydrolysis increased gradually, and the contents of Cl− and ${\rm{SO}}_4^{2-}$ affected by human activities increased significantly. The research shows that the water chemical components of Baotu Spring have mainly come from the water-rock interaction since 1958, and the influence of human activities has been increasing continuously. In different historical periods, different human activities (agricultural activities, industrial and mining activities, groundwater recharge, etc.) have different effects on the hydrogeochemical evolution of Baotu Spring. -
Key words:
- Baotu Spring /
- hydrogeochemistry /
- evolution characteristics /
- mineral saturation index
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表 1 趵突泉水化学参数统计表
Table 1. Statistics of hydrochemical parameters of Baotu Spring
特征值 K+ Na+ Ca2+ Mg2+ Cl− ${\rm{SO}}_4^{2-}$ ${\rm{HCO}}_3^{-}$ ${\rm{NO}}_3^{-}$ 总硬度 TDS pH 最小值 0.50 1.66 43.28 8.63 7.55 2.35 122.23 0.10 151.48 88.89 7.01 最大值 3.08 58.03 131.26 23.21 73.20 240.02 292.00 50.50 418.15 559.37 8.40 平均值 1.18 17.09 88.81 16.77 34.73 60.25 243.06 28.12 292.70 373.22 7.70 标准差 0.54 10.47 23.59 3.61 16.54 41.00 33.10 13.05 69.11 115.77 0.28 变异系数 0.46 0.61 0.27 0.22 0.48 0.68 0.14 0.46 0.24 0.31 0.04 注:单位为mg·L−1,pH为无量纲,变异系数为无量纲,总硬度以CaCO3计。
Note: Unit is mg·L−1; pH is dimensionless; variation coefficient is dimensionless; total hardness is calculated by CaCO3.表 2 趵突泉矿物饱和指数统计表
Table 2. Statistics of mineral saturation indexes
矿物饱和指数
特征值SIc SId 样本量/个 最大值 最小值 平均值 最大值 最小值 平均值 枯水期 1.03 0.11 0.47 1.53 −0.2 0.47 26 平水期 1.13 −0.20 0.40 1.75 −0.89 0.32 14 丰水期 1.22 −0.09 0.55 1.96 −0.76 0.63 30 -
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