Source identification of inrush water based on groundwater hydrochemistry and statistical analysis

2016 ◽  
Vol 11 (2) ◽  
pp. 448-458 ◽  
Author(s):  
Linhua Sun ◽  
Song Chen ◽  
Herong Gui
Keyword(s):  
Coal Mine ◽  
Environmental Protection Agency ◽  
Source Identification ◽  
Water Source ◽  
Rock Interaction ◽  
Aquifer System ◽  
Ion Concentrations ◽  
Major Ion ◽  
Aquifer Systems ◽  
Groundwater Hydrochemistry

Water source identification is important for water hazard controlling in coal mines. In this study, major ion concentrations of the groundwater collected from four representative aquifer systems in the Baishan coal mine, northern Anhui Province, China, have been analysed by a series of statistical methods. The results indicate that the major ion concentrations of the groundwater from different aquifer system are different with each other, and provided the possibility of water source identification based on hydrochemistry. Factor analysis indicates that these differences are controlled by different types of water rock interactions. The analysis based on US Environmental Protection Agency (EPA) Unmix model identified three sources (weathering of silicate minerals, dissolution of carbonate and evaporate minerals) responsible for the hydrochemical variations of the groundwater. Also, it shows that their contributions for the groundwater in different aquifer systems vary considerably. Based on these variations and on step by step analysis, the source aquifer system for the groundwater samples with unknown source has been determined and, similar to the result obtained by the cluster and discriminant analysis. Therefore, EPA Unmix model can be applied for water source identification in coal mine, as it can provide information about water rock interaction and water source identification simultaneously.

scholarly journals Statistical analyses of groundwater chemistry in the Qingdong coalmine, northern Anhui province, China: implications for water–rock interaction and water source identification

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Kai Chen ◽  
Linhua Sun ◽  
Jiying Xu
Keyword(s):  
Source Identification ◽  
Major Ions ◽  
Chemical Constituents ◽  
Water Source ◽  
Anhui Province ◽  
Rock Interaction ◽  
Ion Concentrations ◽  
Major Ion ◽  
Inrush Water ◽  
Water Rock Interaction

AbstractHydrochemistry of groundwater is important in coal mines because it can be used for understanding water–rock interaction and inrush water source identification. In this study, major ion concentrations of groundwater samples from the loose layer aquifer (LA), coal-bearing aquifer (CA) and Taiyuan Formation limestone aquifer (TA) in the Qingdong coal mine, northern Anhui province, China, have been analyzed by a series of statistical methods for identifying the source of chemical constituents in groundwater and the source of inrush water. The results indicate that the mean concentration of the major ions in the LA were ordered as follows: HCO3− > SO42− > Na+ + K+  > Cl− > Ca2+ > Mg2+ > CO32−, whereas average values of the CA in decreasing order are SO42−, Na+ + K+, HCO3−, Cl−, Ca2+, Mg2+ and CO32−, and the major ion concentrations of the TA have the following order: SO42− > Na+ + K+ > Ca2+  > HCO3− > Cl− > Mg2+ > CO32−, and most of the samples are Na-SO4 and Ca-SO4 types. TDS content in water increases with aquifer depth, whereas the pH values ranged from 7.1 to 8.9, indicating a weak alkaline environment. Two sources (weathering of silicate minerals and dissolution of evaporate minerals) have been identified by principal component analysis responsible for the chemical variations of the groundwater, and their contribution ratios have been quantified by Unmix model. Moreover, based on the Q-mode cluster and discriminant analyses, the samples with known sources have been identified correctly to be 95.7% and 97.6%, respectively, and the samples with unknown sources have been determined with high probability (78–100%).

Chemistry of Groundwater from Two Aquifers in Liuyi Coal Mine, Northern Anhui Province, China: a Comparative Study

2012 ◽  
Vol 212-213 ◽  
pp. 362-365 ◽  
Author(s):  
Lin Hua Sun ◽  
He Rong Gui
Keyword(s):  
Comparative Study ◽  
Coal Mine ◽  
Principle Component Analysis ◽  
Anhui Province ◽  
Ion Concentrations ◽  
Principle Component ◽  
Major Ion ◽  
Groundwater Samples ◽  
Mineralized Water ◽  
Saturation Indexes

Major ion concentrations of twenty groundwater samples from two deep seated aquifers (coal bearing-GC and limestone-LC) are analyzed for identify the differences between them and the source of ions. The results suggest that they are moderate to highly mineralized water with their average TDS values are 2444 (GC) and 1178 (LC) mg/L. LCs show lower Na but much higher Ca and Mg concentrations relative to GCs. Saturation indexes and principle component analysis, as well as mole ratios between Na and Cl, Ca and SO4, Ca and HCO3 indicate that they have multi sources with incorporation of halite and albite for Na, calcite, dolomite and gypsum for Ca, pyrite and gypsum for SO4.

Identification of Hydro-Geochemical Processes in Groundwater by Using Major Ion Chemistry: A Case Study

2013 ◽  
Vol 726-731 ◽  
pp. 3424-3428
Author(s):  
Lin Hua Sun
Keyword(s):  
Coal Mine ◽  
Water Source ◽  
Geochemical Processes ◽  
Ion Chemistry ◽  
High Concentration ◽  
Source Discrimination ◽  
Chemical Systems ◽  
Major Ion ◽  
Groundwater Samples ◽  
The Operating Mechanism

Hydro-geochemistry is important for water disaster controlling as it can be used for either understanding of hydrological evolution or water source discrimination. Groundwater samples from the sandstone aquifer in Xutuan coal mine, northern Anhui Province, China have been collected for major ion chemical analysis to understand the operating mechanism of geochemical processes for variation of groundwater chemistry, which will be useful for improving the understanding of hydro-chemical systems in coal mine. The results suggest that they are medium to slightly (6.8 to 8.64 with an average of 7.61) with high concentration of total dissolved solids (943 and 1362 mg/L with mean of 1171 mg/L)). Most of the groundwater samples are classified as Na- HCO3-Cl and Na-Cl- HCO3 types according to their relative concentrations of cations and anions. Correlation between ion concentrations, as well as principle component analysis imply that dissolution of dolomite, halite, gypsum, silicate weathering and ion exchange are responsible for the chemical variations of the groundwater.

Hydrochemical Characteristics and Groundwater Source Identification of a Multiple Aquifer System in a Coal Mine

2017 ◽  
Vol 37 (3) ◽  
pp. 528-540 ◽  
Author(s):  
Jiazhong Qian ◽  
Yan Tong ◽  
Lei Ma ◽  
Weidong Zhao ◽  
Ruigang Zhang ◽  
...  
Keyword(s):  
Coal Mine ◽  
Source Identification ◽  
Hydrochemical Characteristics ◽  
Aquifer System ◽  
Groundwater Source

scholarly journals Distinct stores and the routing of water in the deep critical zone of a snow-dominated volcanic catchment

2019 ◽  
Vol 23 (11) ◽  
pp. 4661-4683 ◽  
Author(s):  
Alissa White ◽  
Bryan Moravec ◽  
Jennifer McIntosh ◽  
Yaniv Olshansky ◽  
Ben Paras ◽  
...  
Keyword(s):  
Shallow Groundwater ◽  
Critical Zone ◽  
Shallow Aquifer ◽  
Precipitation Pattern ◽  
Fractured Aquifer ◽  
Aquifer System ◽  
Major Ion ◽  
Welded Tuff ◽  
Aquifer Systems ◽  
Isotopic Analyses

Abstract. This study combines major ion and isotope chemistry, age tracers, fracture density characterizations, and physical hydrology measurements to understand how the structure of the critical zone (CZ) influences its function, including water routing, storage, mean water residence times, and hydrologic response. In a high elevation rhyolitic tuff catchment in the Jemez River Basin Critical Zone Observatory (JRB-CZO) within the Valles Caldera National Preserve (VCNP) of northern New Mexico, a periodic precipitation pattern creates different hydrologic flow regimes during spring snowmelt, summer monsoon rain, and fall storms. Hydrometric, geochemical, and isotopic analyses of surface water and groundwater from distinct stores, most notably shallow groundwater that is likely a perched aquifer in consolidated collapse breccia and deeper groundwater in a fractured tuff aquifer system, enabled us to untangle the interactions of these groundwater stores and their contribution to streamflow across 1 complete water year (WY). Despite seasonal differences in groundwater response due to water partitioning, major ion chemistry indicates that deep groundwater from the highly fractured site is more representative of groundwater contributing to streamflow across the entire water year. Additionally, the comparison of streamflow and groundwater hydrographs indicates a hydraulic connection between the fractured welded tuff aquifer system and streamflow, while the shallow aquifer within the collapse breccia deposit does not show this same connection. Furthermore, analysis of age tracers and oxygen (δ18O) and stable hydrogen (δ2H) isotopes of water indicates that groundwater is a mix of modern and older waters recharged from snowmelt, and downhole neutron probe surveys suggest that water moves through the vadose zone both by vertical infiltration and subsurface lateral flow, depending on the lithology. We find that in complex geologic terrain like that of the JRB-CZO, differences in the CZ architecture of two hillslopes within a headwater catchment control water stores and routing through the subsurface and suggest that shallow groundwater does not contribute significantly to streams, while deep fractured aquifer systems contribute most to streamflow.

Quality of water from subsidence area: a case study in the Luling coal mine, northern Anhui Province, China

2015 ◽  
Vol 10 (4) ◽  
pp. 777-786 ◽  
Author(s):  
Linhua Sun ◽  
Xianghong Liu ◽  
Chen Cheng
Keyword(s):  
Coal Mining ◽  
Coal Mine ◽  
Anhui Province ◽  
Sodium Absorption ◽  
Ion Concentrations ◽  
Major Ion ◽  
Subsidence Area ◽  
Quality Of Water ◽  
Two Samples

Quality of water in the subsidence area related to coal mining is important for water usage in the coal mining areas. In this study, forty-two samples from the subsidence pools in the Luling coal mine, northern Anhui Province, China have been collected and measured for their major ion concentrations, and the data have been applied for quality evaluating of drinking and irrigation purposes. The results suggest that the water samples from different pools have different concentrations of major ions and all of them can be classified to be Na-HCO3 type. According to the results of water quality index, all of them are suitable for drinking (considering only about the major ion concentrations). However, sodium absorption ratio (SAR) and residual sodium carbonate (RSC) give different answers about irrigation purpose, the water can be used for irrigation according to SAR whereas cannot be used according to RSC, and can be attributed to the high concentrations of CO32− and HCO3−. Gibbs diagrams and relationships between Na+ normalized Ca2+, Mg2+ and HCO3− suggest that different extents of contributions from weathering of silicate, dissolution of carbonates and evaporates are the main mechanism controlling the major ion concentrations of water from the subsidence areas in this study, which is related to the natural conditions of the pools.

Hydrochemistry of groundwater from loose layer aquifer system in northern Anhui Province, China: source of major ions and hydrological implications

2015 ◽  
Vol 10 (2) ◽  
pp. 269-276 ◽  
Author(s):  
Linhua Sun
Keyword(s):  
Major Ions ◽  
Anhui Province ◽  
Aquifer System ◽  
Ion Concentrations ◽  
Major Ion ◽  
Normality Test ◽  
Groundwater Samples ◽  
Domestic Use ◽  
Anderson Darling ◽  
Loose Layer

Groundwater from the loose layer aquifer system is important in northern Anhui Province, China, because it is an important water supplier for agriculture, industrial and domestic use. However, it is also a threat for the safety of coal mining. In this study, major ion concentrations of 43 groundwater samples from the loose layer aquifer system in Huaibei coalfield, northern Anhui Province, China have been measured and analyzed by EPA Unmix model for tracing their sources. The results suggest that they can be classified to be Na-Cl type according to their major ion concentrations. Statistical analysis (coefficients of variations and the Anderson–Darling normality test) indicates that more than one source is responsible for the major ions. Three sources have been identified by Umix model with different contributions for each sample, and the total dissolved solids contributed by the chloride, silicate-carbonate and sulfate sources are 10%, 47%, and 43%, respectively. The variations of contributions from the three sources for the samples probably relate to: (1) the inhomogeneity of mineral compositions and (2) the different locations (recharge or discharge) of the samples collected.

Hydrogeochemical Characteristics and Groundwater Inrush Source Identification for a Multi‐aquifer System in a Coal Mine

2019 ◽  
Vol 93 (6) ◽  
pp. 1922-1932 ◽  
Author(s):  
Haitao ZHANG ◽  
Guangquan XU ◽  
Xiaoqing CHEN ◽  
Jian WEI ◽  
Shitao YU ◽  
...  
Keyword(s):  
Coal Mine ◽  
Source Identification ◽  
Groundwater Inrush ◽  
Aquifer System

The Distribution of Volatile Organics in a Leachate Plume, Gloucester, Ontario

1987 ◽  
Vol 22 (1) ◽  
pp. 49-64 ◽  
Author(s):  
J.F. Devlin ◽  
W.A. Gorman
Keyword(s):  
Organic Contaminants ◽  
Source Area ◽  
Unconfined Aquifer ◽  
High Concentration ◽  
Organic Contamination ◽  
Aquifer System ◽  
Aquifer Systems ◽  
Volatile Organic ◽  
Volatile Organic Contaminants ◽  
Aquifer Sediments

Abstract The Gloucester Landfill is located near Ottawa, Ontario, on a northeast trending ridge of Quaternary age. The ridge comprises outwash sediments which make up two aquifer systems. A confined system exists next to bedrock, and is overlain by a silty-clayey stratum (the confining layer) which is, in turn, overlain by an unconfined aquifer system. Two independent volatile organic plumes have previously been identified at the landfill: the southeast plume, which has penetrated the confined aquifer system, and the northeast plume which is migrating in the unconfined aquifer. The distribution of volatile organic contaminants at the northeast plume site appears to be a function of two factors: (1) heterogeneities in the aquifer sediments are causing the channeling of contaminants through a narrow path; (2) the low fraction of organic carbon in the unconfined aquifer sediments at the northeast site is resulting in little retardation of the contaminants there, relative to those at the southeast site. Acetate was the only volatile fatty acid detected in the leachate. It was measurable only in areas where the volatile organic contamination was significant. Although methane was detected in the contaminated sediments, suggesting that microbial activity was present, the high concentration of acetate (>1000 ppm) which was detected down-gradient from the source area indicates that any biodegradation which is occurring is proceeding at a very slow rate.

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