Source-tracing  of sulfate in groundwater of Xizhang Well Group in the Liuzheng water source area of Zibo City

LIU Zhizheng; LI Shuang; LIU Baihan; ZHANG Xuesong; LIU Huafeng; PENG Junfeng; LIU Yunde

doi:10.11932/karst20230517

2023 No. 5

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LIU Zhizheng, LI Shuang, LIU Baihan, ZHANG Xuesong, LIU Huafeng, PENG Junfeng, LIU Yunde. Source-tracing of sulfate in groundwater of Xizhang Well Group in the Liuzheng water source area of Zibo City[J]. Carsologica Sinica, 2023, 42(5): 1074-1084. doi: 10.11932/karst20230517

Citation:

LIU Zhizheng, LI Shuang, LIU Baihan, ZHANG Xuesong, LIU Huafeng, PENG Junfeng, LIU Yunde. Source-tracing of sulfate in groundwater of Xizhang Well Group in the Liuzheng water source area of Zibo City[J]. Carsologica Sinica, 2023, 42(5): 1074-1084. doi: 10.11932/karst20230517

Source-tracing of sulfate in groundwater of Xizhang Well Group in the Liuzheng water source area of Zibo City

1.
Shandong Institute of Geological Survey, Jinan, Shandong 250014, China
2.
Zibo Water Conservancy Service Center, Zibo, Shandong 255000, China
3.
China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China

More Information

Corresponding author: ZHANG Xuesong, 252724319@qq.com

Received Date: 20 April 2023

Accepted Date: 25 July 2023

Publish Date: 25 October 2023

Abstract

Abstract

Affiliated to both Linzi district of Zibo City and Qingzhou City of Weifang City, the Liuzheng water source area belongs to the run-off and drainage area of the Dawu hydrogeological unit. This area plays a significant role in the water supply for residents and enterprises, and thus enjoys an important strategic position. There are four pumping well groups in the water source area, among which the Xizhang Well Group is located in the west of the water source area, including four wells from LK05 to LK08. The water source area is located in the intermountain depression and river valley area with the Quaternary system of 20-meter to 70-meter thickness, underlain with Jiulong Group (Є₃-O₁J) and Majiagou Group (O_2-3M). Zihe fault zone, Bianhe Fault, Wangzhai fault and other fault structures are developed in this area, which control the stratum distribution and groundwater movement. At present, the water-bearing rock groups with water-supply significance in the water source area are mainly those of carbonate fissure karst, which are representatives in areas of karst water source in the north of China. The aquifer lithology, highly rich in water, is mainly composed of limestone, dolomitic limestone and dolomite of the Majiagou Group and Jiulong Group of Sanshanzi Formation. The overall runoff of karst groundwater is northeast oriented along the fault zone of the Zihe river, and the groundwater dynamics are influenced by human mining and atmospheric precipitation. The hydrochemical type is mainly HCO₃-Ca (Ca·Mg), and the water quality is generally good, but the indexes of sulfate, total hardness and ammonia nitrogen in the Xizhang Well Group exceed the permitted standard of Class III groundwater. Based on the test analysis of karst groundwater in Xizhang Well Group and its surrounding areas, it is found that the area where sulfate exceeds the permitted level is mainly distributed in the area of Yanghuya-Shuangyangyouzhi, and the sulfate content decreases from the center of this area to its surrounding parts.
At present, the research on karst water system in the Liuzheng water source area mainly focuses on the sequential dynamic change of water quality and quantity and the spacial distribution characteristics. However, few studies have been conducted on the directional sources of chemical components in karst groundwater. In order to ensure the safety of water supply, it is urgent to carry out the source-tracing analysis of groundwater sulfate under the influence of human activities. The sources of chemical components in groundwater are generally studied systematically by statistical analysis, hydrogeochemical analysis, fuzzy mathematics, numerical simulation and other methods based on geological and hydrogeological conditions. All kinds of methods have specific applicable conditions and advantages, but most of them are difficult to trace the source quickly and accurately, and identify the specific migration process. In this study, hydrogeochemical analysis, tracer test, isotope indication analysis and other methods are used to carry out a comprehensive source-tracing analysis of sulfate in the Xizhang Well Group. The results show that the method used in this study is effective in source-tracing.
Based on the analysis of the dynamic characteristics of groundwater and the mechanism of recharge, runoff and discharge in the Liuzheng water source area, the power source of sulfate source was analyzed by tracer test. Besides, the main path of sulfate migration was described, and the target area of sulfate source—Wangzhai basin, a special recharge area of water source—was determined. On the basis of power source analysis, isotope samples were collected in the target area and its surrounding areas, and the contribution of different end-member sources to groundwater sulfate was calculated by using the ternary mixing model of sulfate content and sulfur and oxygen isotope composition, and then the material sources of the pollution in the Xizhang Well Group were quantified.
The calculation results show that the proportion of sulfate from sulfide oxidation in groundwater is large, and there are 17 water samples exceeding 50%. Because there is A Pollution Source instead of coal-bearing strata in the area, the A end-member represents that the sulfate of this area comes from A Pollution Source. There were no water samples occupying more than 50% in the B end-member, indicating that the contribution of atmospheric precipitation to sulfate in water was small. There were 3 water samples accounting for more than 50% in the C end-member, indicating that other human factors also contributed to a certain proportion. The comprehensive analysis confirms that the main source of sulfate in the karst groundwater of the Xizhang Well Group is the A Pollution Source in Wangzhai basin, followed by the atmospheric precipitation and other unknown factors.
- the Liuzheng water source area /
- karst /
- groundwater /
- source-tracing of sulfate /
- isotope

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References

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