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首页> 外文期刊>Environmental Science & Technology >Aquatic-Terrestrial Partitioning of Deep Groundwater Discharge Using Measured Helium Fluxes
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Aquatic-Terrestrial Partitioning of Deep Groundwater Discharge Using Measured Helium Fluxes

机译：利用测得的氦通量对地下水深层进行水-陆分配

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Performance assessments of nuclear fuel disposal vaults deep in the geosphere have generally assumed that all deep groundwater enters a lake or river and that no wetland or terrestrial discharge occurs. Animal licks in Ontario and Alberta, Canada, indicate that saline waters typical of deep groundwater do emerge in the biosphere. Helium gas, produced in situ in granitic rock, is used in this study to partition groundwater discharge. He flux comparisons were made on a flood plain with anomalously high He concentrations in the surface water of a creek and in the soil gas of an adjacent deer lick. This unique study, comparing direct flux-chamber methods with indirect methods using ping-pong balls as He gas collectors, indicates that 92% of the He produced in situ in the granite below this flood plain enters the creek and 8% enters the wetland. This partitioning is sensitive to the size of the terrestrial area considered and could be as high as 83% aquatic and 17% terrestrial at this location. Although this represents only one site, it suggests biosphere assessment models could use an aquatic-terrestrial partition of up to 80/20 for deep groundwater discharge unless site-specific data are available.
机译：对地球深处的核燃料处置库的性能评估通常假定所有深层地下水都进入湖泊或河流，并且不会发生湿地或陆地排放。加拿大安大略省和艾伯塔省的动物舔食表明，深层地下水典型的盐水确实出现在生物圈中。在这项研究中，在花岗岩中原位产生的氦气用于划分地下水排放。在一条小溪的地表水和相邻的鹿舔的土壤气体中异常高的氦气浓度的洪泛平原上进行了氦通量比较。这项独特的研究将直接通量室方法与使用乒乓球作为He气体收集器的间接方法进行了比较，结果表明，在该洪泛平原以下的花岗岩中，原位产生的He中有92％的He进入小河，而8％进入湿地。这种划分对所考虑的陆地面积敏感，在该位置可能高达83％的水生和17％的陆地。尽管这仅代表一个地点，但它表明，除非可获得特定地点的数据，否则生物圈评估模型可以使用高达80/20的水陆分配来进行深层地下水排放。

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