IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Tritium-3He dating and noble gases techniques in water resources management: recharge, infiltration conditions and groundwater balance.
Autor/es:
SOLOMON K.; MATSUMOTO T.; AGGARWAL P.; ANOVSKI A.; PLACSU L.; OZYURT N.; MARAH H.; DARLING W.G.; MARTINEZ D.E.; TASMEEN N.A.; SANDA M.; ROLLER-LUTZ Z. ; FOURRE E.; MARUOKA T.
Lugar:
Viena, austria
Reunión:
Simposio; International Symposium on Isotope Hydrology: Revisiting Foundations and Exploring Frontiers.; 2015
Institución organizadora:
International Atomic Energy Agency.
Resumen:
The IAEA organized a Cooperative Research Project (CRP) with participants from 11 countries with the objective of developing and testing 3H/3He methodologies to improve assessment of groundwater recharge and discharge rates. The turnover time of groundwater reservoir is directly related to storage volume and sustainable yield and therefore has the potential to contribute to sustainable management of groundwater resources. At the sites studied during the CRP, we found that samples collected using passive diffusion samplers typically had apparent 3H/3He ages that were about 10% lower than conventional copper tubes over a wide range of ages (0-45 years). Noble gas recharge temperatures ranged from 5 to 25 ˚C and were generally correlated with ambient air temperatures. Initial 3H values (obtained by summing 3H and tritiogenic 3He) were typically near the atmospheric value for a recharge year given by the 3H/3He age, suggesting minimal mixing in the subsurface. Depthspecific samples typically showed increasing age with depth and can be interpreted to provide estimates of recharge rates. The unique data set from this CRP suggests that the 3H/3He method is applicable to a wide range of hydrogeologic environments and is capable of providing valuable information for water resource investigations.