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标题：Identifying and quantifying groundwater inflow to a stream using 220Rn and 222Rn as natural tracers
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作者：Yong Hwa Oh ; Dong-Chan Koh ; Hong-Il Kwon 等
期刊名称：Journal of Hydrology: Regional Studies
印刷版ISSN：2214-5818
出版年度：2021
卷号：33
页码：100773
DOI：10.1016/j.ejrh.2021.100773
出版社：Elsevier B.V.
摘要：Study region Noseong Stream watershed in Nonsan, Chuncheongnam-do, South Korea. Study focus This study aims to identify and quantify groundwater inflow to a stream based on the spatial and temporal distributions of 220 Rn and 222 Rn activities in stream water and groundwater. Groundwater–stream water exchange fluxes were estimated on the basis of 222 Rn mass balance approaches under losing and gaining stream conditions, and groundwater inflow type was identified using a spatial survey of 220 Rn in stream water. New hydrological insights for the region The 222 Rn activities at 20 stations along the stream during four sampling campaigns were higher at high altitudes than low altitudes, regardless of the season. At two sections, which appeared to be gaining systems, the groundwater inflow rates were estimated to be 6.5 × 10 2 and 4.0 × 10 2 m 3 d –1 . At another stream section, where groundwater inflow to the stream and stream water leakage into groundwater may alternatingly occur, the groundwater inflow and stream water leakage were 1.5 × 10 2 and 2.5 × 10 4 m 3 d –1 , respectively. A spatial survey of 220 Rn along the stream indicates that groundwater may dominantly discharge to the stream water as point sources rather than diffuse seepage.
关键词：Stream-aquifer exchange flux ; 220 Rn ; 222 Rn mass balance model ; Groundwater inflow rate ; Losing and gaining streams ; Noseong Stream