Recharge and spatial distribution of groundwater hydrochemistry in the Geum River basin, South Korea

Choi, Hanna; Lee, Chung-Mo; Koh, Dong‐Chan; Yoon, Yoon Yeol

doi:10.1007/s10967-021-07807-8

Cited by 6 publications

(21 citation statements)

References 19 publications

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“…The results of H-3 analysis for each region ranged from the maximum of 14.1 TU to less than the minimum detection limit of 0.3 TU. This result was not signi cantly different from the previous results in the Geum River basin [23] (Fig. 3).…”

Section: Tritium Distributioncontrasting

confidence: 75%

“…2). Approximately 81.5% of the groundwater samples showed a Ca-HCO 3 type, which was considered to re ect the typical water-rock interaction of the shallow aquifer in the Geum River basin [23]. The Ca-HCO 3 -Cl type samples G19, 26, and 27 were collected from the coastal area; thus, the Cl − of seawater might have affected the groundwater quality.…”

Section: Sampling and Analysis Methodsmentioning

confidence: 99%

“…The annual average temperature of the basin is 11.6 ± 1.4°C, and the annual average precipitation is approximately 1,300 mm based on observations from the major meteorological stations. More than 55% of the annual precipitation is contributed by summer precipitation, and dry season precipitation is approximately 224 mm from December to April [23]. The Geum River water system has the largest area in the Geum River basin, which has a basin area of 9912 km 2, with forests accounting for more than 50% of the basin area and agricultural land accounting for approximately 35% [24].…”

Section: Site Descriptionmentioning

confidence: 99%

“…As shown in Table 2, the average value of the H-3 concentration of the groundwater sample in the study area was 3.27, and the median value was 2.21 (n = 27), which was considered to be a mixture of modern water (precipitation or surface water) and groundwater with a relatively long residence time [23,35]. More than three groundwater samples were collected for H-3 analysis from each of the eight counties and administrative districts.…”

Section: Tritium Distributionmentioning

confidence: 99%

“…The area of the Geum River Basin contains the Okcheon metamorphic belt, which is a representative region with a high U content in Korea [19,20,22]. Metamorphic rocks of the Precambrian era are mainly distributed in the upper part of the Geum River Basin, and granites of the Mesozoic era are distributed in the middle and lower parts [23,24]. The difference in geological characteristics is related to the topography of the basin.…”

Section: Introductionmentioning

confidence: 99%

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Hydrochemical characteristics and distribution of uranium in groundwater of the Geum River Basin, South Korea

Choi

Koh

Yoon

2022

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In the Geum River basin in Korea, local groundwater contamination has been occurring due to the complex influence of urbanization and agricultural activities. For proper utilization as a water resource, this study identified major influencing factors of groundwater hydrochemistry in the bedrock aquifer by statistical analysis and regional uranium (U) distribution as a redox-sensitive contaminant. The H-3 concentration of the groundwater was high in the plains and low in the mountain areas; thus, it was deemed to be affected by the residence time of groundwater after precipitation recharge. The hydrochemical properties and factor loading values of the principal components indicated that the major factors were water‒rock interactions and residence time, but a positive correlation of K-NO3 and Mg-Cl showed the influence of agricultural activities. Cl− increased as it moved downstream, while NO2− was found to decrease from upstream to midstream, and NO3− showed no regularity. Thus, the main groundwater pollutants upstream and downstream in the Geum River basin were likely to be contributed by agricultural activities and seawater infiltration, respectively. The U in groundwater existed in the UO2(CO3)22− (namely, uranyl ion), and the highest concentration was observed at neutral pH. It had a positive correlation with HCO3, pH, and Ca and a weak negative correlation with NO3.

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Section: Tritium Distributioncontrasting

confidence: 75%

Section: Sampling and Analysis Methodsmentioning

confidence: 99%

Section: Site Descriptionmentioning

confidence: 99%

Section: Tritium Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrochemical characteristics and distribution of uranium in groundwater of the Geum River Basin, South Korea

Choi

Koh

Yoon

2022

Preprint

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Spatial investigation of water quality and estimation of groundwater pollution along the main stream in the Geum River Basin, Korea

Choi

Koh

Yoon

2023

Environ Geochem Health

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This study aims to identify spatially water quality distribution of groundwater and surface water in reservoirs, and comprehensively to address possible influencing factors. The concentration of NO3 in the reservoirs along the main stream of the Geum River was generally lower than that in groundwater. The pollution level of the reservoir, especially the particulate pollutant SS, clearly showed seasonal variations and increased significantly downstream. The H-3 concentration of the groundwater was high in the plains and low in the mountain areas, indicating a difference in residence time between the two regions. The hydrochemical properties and factor loading values of the principal components indicated that the major factors were water‒rock interactions and residence time, but a positive correlation of K-NO3 and Mg-Cl showed the influence of agricultural activities. The main groundwater pollutants were likely to be contributed by agricultural activities at upstream and seawater intrusion at downstream. The sensitive redox species uranium in the groundwater of this region existed as the uranyl ion, and it showed a positive correlation with HCO3, pH, and Ca. The results emphasize the importance of monitoring both tributaries and groundwater together in order to effectively manage the water quality of the Geum River basin.

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Assessment of spatio-temporal variations in groundwater quality for the groundwater-dependent Maltese islands

Choi,

Lee,

Park

et al. 2024

Journal of Hydrology: Regional Studies

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Recharge and spatial distribution of groundwater hydrochemistry in the Geum River basin, South Korea

Cited by 6 publications

References 19 publications

Hydrochemical characteristics and distribution of uranium in groundwater of the Geum River Basin, South Korea

Hydrochemical characteristics and distribution of uranium in groundwater of the Geum River Basin, South Korea

Spatial investigation of water quality and estimation of groundwater pollution along the main stream in the Geum River Basin, Korea

Assessment of spatio-temporal variations in groundwater quality for the groundwater-dependent Maltese islands

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