The Rn-222, H-3 and stable isotopes as tracers of groundwater-surface water interactions in a stream basin

摘要

Natural isotopes such as Rn-222, H-3, O-18 and D were used to understand the groundwater-surface water interactions and these tracer showed surface water intrusion effect during the winter. The Rn-222 concentrations of samples retrieved from the multi-depth well varied with sampling point and time, e.g. they decreased by about 80 % during the winter. The results of the analyses of stable isotopes show that the mean delta O-18 value was -7.84 % (-9.16 % to -7.24 %), while the mean dD value was -54.13 % (-57.86 % to -50.98 %). The H-3 groundwater concentrations ranged from 0.23 to 0.59 Bq/L, with an average value of 0.37 Bq/L.