Research Article
The Cause of Drop of the Water Level of Underground Quaternary Aquifer of a Mine under Mining Influence
Table 4
Statistical characteristics of coal bearing sandstone aquifer in experimental coal mine.
| | Component | Na++K+ | Ca2+ | Mg2+ | Cl- | SO42- | HCO3- | CO32- | TDS | pH |
| | Number of samples | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | | Minimum value | 281.8 | 3.96 | 1.92 | 131.03 | 10.29 | 348.52 | 0 | 707.96 | 7.54 | | Maximum value | 1,160.51 | 22.99 | 10.81 | 514.04 | 1,896.65 | 954.52 | 151.25 | 3,510.43 | 9.06 | | Average value | 610.071 | 9.258 | 5.239 | 237.587 | 403.55 | 635.391 | 55.297 | 1,638.70 | 8.554 | | Standard deviation | 260.324 | 5.986 | 3.197 | 121.645 | 630.56 | 197.23 | 47.737 | 847.30 | 0.507 | | Coefficient of variation | 0.427 | 0.647 | 0.61 | 0.512 | 1.563 | 0.31 | 0.863 | 0.517 | 0.059 | | value | 0.102 | 0.067 | 0.063 | 0.01 | <0.01 | >0.15 | >0.15 | 0.035 | 0.016 |
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