Study on hydrogeochemical connection and water quality assessment of subsidence lake and shallow groundwater in Luling coal-mining area of the Huaibei coalfield, Eastern China

Abstract

The surface water from subsidence lake and shallow groundwater play an important role for agriculture, industry and local communities in coal mining areas. The connection between two type water and quality, however, remains unclear. In this study, 37 samples were collected from subsidence lake and shallow groundwater around Luling coal mine. The hydrogeochemisty data and formation mechanisms were analyzed to reveal the connection proof. Compared with shallow groundwater, the surface water from subsidence lake have a higher content of Na+ and HCO3−. For two type water samples, Na+ and Mg2+ are two most abundant cations, followed by Ca2+. The contents of anions followed the same order: HCO3− > SO42− > Cl−. The water samples were controlled by NaHCO3 (99.3%) type. The chemical composition of two type water were similar, which are all mainly influenced by silicate minerals weathering and ion-exchange interactions, among which ion-exchange interactions was more intense than in shallow groundwater. The recharging source of two type water mainly came from atmospheric precipitation. The two water in the study area, in general, showed the risk of high salt and low-moderate alkali damage. The outcomes provide a better understanding of subsidence lake and groundwater and it will help for utilization of water resources.

Microbial community structural response to variations in physicochemical features of different aquifers

“…According to the comparison shown in Figure 2 , the variation in anion concentration was more severely influenced by the environment ( Yang et al, 2020 ; Yuan Y. et al, 2020 ; Xu et al, 2022 ). Cl – concentration was high in both the coastal and arid zones due to the presence of seawater intrusion in the coastal zone and evaporation in the arid zone ( Idowu et al, 2022 ; Yin et al, 2022 ).…”

Risk Assessment of Water Inrush from Coal Seam Roof Based on the Combined Weighting of the Geographic Information System and Game Theory: A Case Study of Dananhu Coal Mine No. 7, China

“…The basin is long and strip-shaped, broad in the west and narrow in the east, with well-exposed central outcrops and rock formations from the Paleoproterozoic-Neoproterozoic and Quaternary systems covering the eastern and western ends. The area has few internal faults, but positive regional defects are present along the southern edge with a north-east trend, a south-east tendency, and a steep dip [21]. In this excellent field, fracture structures are infrequent, and a few high-angle faults facing the north-east exist.…”

Hydrogeochemical evolution of Taiyuan Formation limestone water under the disturbance of water inrush from karst collapse column in Taoyuan Coal Mine, China

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