title: Determination of recharge fraction of injection water in combined abstraction-injection wells using continuous radon monitoring.
abstract: The recharge fractions of injection water in combined abstraction-injection wells (AIW) were determined using continuous radon monitoring and radon mass balance model. The recharge system consists of three combined abstraction-injection wells, an observation well, a collection tank, an injection tank, and tubing for heating and transferring used groundwater. Groundwater was abstracted from an AIW and sprayed on the water-curtain heating facility and then the used groundwater was injected into the same AIW well by the recharge system. Radon concentrations of fresh groundwater in the AIWs and of used groundwater in the injection tank were measured continuously using a continuous radon monitoring system. Radon concentrations of fresh groundwater in the AIWs and used groundwater in the injection tank were in the ranges of 10,830-13,530 Bq/m3and 1500-5600 Bq/m3, respectively. A simple radon mass balance model was developed to estimate the recharge fraction of used groundwater in the AIWs. The recharge fraction in the 3 AIWs was in the range of 0.595-0.798. The time series recharge fraction could be obtained using the continuous radon monitoring system with a simple radon mass balance model. The results revealed that the radon mass balance model using continuous radon monitoring was effective for determining the time series recharge fractions in AIWs as well as for characterizing the recharge system.
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea. Electronic address: kylee@kigam.re.kr.
authors.forename: Kil Yong
authors.initials: KY
authors.lastname: Lee
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Yong-Chul
authors.initials: YC
authors.lastname: Kim
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Cho
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Seong Yun
authors.initials: SY
authors.lastname: Kim
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Yoon Yeol
authors.initials: YY
authors.lastname: Yoon
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Dong Chan
authors.initials: DC
authors.lastname: Koh
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Kyucheol
authors.initials: K
authors.lastname: Ha
authors.affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea.
authors.forename: Kyung-Seok
authors.initials: KS
authors.lastname: Ko
mesh_terms: D060587:Groundwater / Q000737:chemistry*; D008956:Models, Chemical; D011834:Radiation Monitoring / Q000379:methods*; D011886:Radon / Q000032:analysis*; D014875:Water Pollutants, Radioactive / Q000032:analysis*; D060986:Water Wells
chemical_list: D014875:Water Pollutants, Radioactive; D011886:Radon
keywords: Abstraction-injection well; Groundwater recharge; Radon mass balance; Recharge fraction