Groundwater chemical evolution in a sandy silicate aquifer in northern Wisconsin: 1. Patterns and rates of change
書誌事項
- 公開日
- 1992-02
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/91wr02302
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>Patterns and rates of chemical evolution of groundwater in a sandy silicate aquifer were determined by detailed analysis of groundwater velocity and chemistry along short (120 m) flow paths. Groundwater enters the aquifer mainly as seepage from a dilute lake and evolves chemically under open‐CO<jats:sub>2</jats:sub> conditions for at least 8 years before discharging to another lake. Spatial trends in the aquifer are evident for calcium, magnesium, silicon, sodium, CO<jats:sub>2</jats:sub>, alkalinity, <jats:italic>p</jats:italic>H, temperature, and dissolved oxygen. The kinetics of silicate mineral dissolution regulates additions of calcium, magnesium, and alkalinity to the groundwater, causing them to increase steadily along flow paths at about 12 μmol L<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup> (Ca), 6 μmol L<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup> (Mg), and 39 μeq L<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup> (alkalinity) respectively, for at least 3–5 years. Silicon and sodium increase by 41 μmol L<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup> and 13 μmol L<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup> respectively for about 3 years, then level off as the groundwater approaches saturation with respect to kaolinite and smectite.</jats:p>
収録刊行物
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- Water Resources Research
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Water Resources Research 28 (2), 579-589, 1992-02
American Geophysical Union (AGU)