Tritium as an indicator of recharge and dispersion in a groundwater system in central Ontario
書誌事項
- 公開日
- 1989-06
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/wr025i006p01097
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>The detailed distribution of tritium (<jats:sup>3</jats:sup>H) in the recharge area of a shallow unconfined sand aquifer near Sturgeon Falls, Ontario, is described. At this forested, shallow water table site, bomb tritium has penetrated uniformly to a depth of 8–12 m indicating recharge of 15 cm/year, which is 16% of precipitation. The zone of bomb tritium contains <jats:sup>3</jats:sup>H concentrations of from 16 to 269 tritium unit (TU), whereas much lower values (<1 TU) are observed in groundwaters recharged only a few years prior to 1953, the year when significant fallout of bomb tritium began. Tritium distribution is accurately simulated, using one‐ and two‐dimensional models, when the Ottawa record is used for the post‐1953 tritium input function, when dispersion is low and when a prebomb tritium input value of 3 TU is used. This prebomb value is slightly lower than that suggested by Kaufman and Libby (1954), based on precipitation and surface water samples from the early 1950s. The simulations indicate and field data corroborate, that in 1986, <jats:sup>3</jats:sup>H levels of more than 100 TU occur only in groundwaters recharged between 1957 and 1971, while levels in excess of 200 TU occur only in groundwaters recharged during 1961–1967. The 1960s tritium peak is observed within a narrow distinct depth zone at all locations along the flow section investigated.</jats:p>
収録刊行物
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- Water Resources Research
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Water Resources Research 25 (6), 1097-1109, 1989-06
American Geophysical Union (AGU)