• Title/Summary/Keyword: hydrochemistry

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Hydrochemistry of an alluvial aquifer in the Cheonan area: role of the pyrite oxidation on denitrification

  • Kim, Kyoung-Ho;Yun, Seong-Taek;Chae, Gi-Tak;Heo, Chul-Ho;Kim, Hyoung-Soo;Rhee, Chul-Woo;Kim, Kangjoo
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2002.09a
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    • pp.287-290
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    • 2002
  • To examine the denitrification process in an alluvial aquifer in the Cheonan site, hydrological and hydrogeochemical studies were carried out. Elevated levels of NO$_3$ (maximum 77.6 mg/L) were observed in shallow groundwaters of the area, as a result of poultry and agricultural activity. However, the nitrate concentrations were found to be consistently attenuated down to very low levels (<1.0 mg/L). The abrupt removal of nitrate coincided with the pattern of redox change and indicated that denitrification is the most plausible process. The hydrochemistry and mass balance approach using geochemical modeling (phreeqc 2.0) and redox chemistry indicated that chemo-autotrophic denitrification via pyrite oxidation is the key Process to control the nitrate attenuation in the study area.

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Hydrochemical Investigation for Site Characterization: Focusing on the Application of Principal Component Analysis (부지특성화을 위한 지하수의 수리화학 특성 연구: 주성분 분석을 중심으로)

  • Yu, Soonyoung;Kim, Han-Suk;Jun, Seong-Chun;Yi, Jong Hwa;Yun, Seong-Taek;Kwon, Man Jae;Jo, Ho Young
    • Journal of Soil and Groundwater Environment
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    • v.27 no.spc
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    • pp.34-50
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    • 2022
  • Principal component analysis (PCA) was conducted using hydrochemical data in four testbeds (A to D) built for the development of site characterization technologies to assess the hydrochemical processes controlling the hydrochemistry in each site. The PCA results indicated the nitrogen loading to deep bedrock aquifers through permeable fractures in Testbed A, the chemical weathering enhanced with the biodegradation of petroleum hydrocarbons in Testbed B, the reductive dechlorination in Testbed C, and the different hydrochemistry depending on the depth to bedrock in Testbed D, consistent with the characteristics of each site. In Testbeds B and D, outliers seemed to affect the PCA result probably due to the small number of samples, whereas the PCA result was still consistent with site characteristics. This study result indicates that the PCA is widely applicable to hydrochemical data for the assessment of major hydrochemical processes in contamination sites, which is useful for site characterization when combined with other site characterization technologies, e.g., geological survey, geophysical investigation, borehole logging. It is suggested that PCA is applied in contaminated sites to interpret hydrochemical data not only for the distribution of contamination levels but also for the assessment of major hydrochemical processes and contamination sources.

통계분석을 이용한 소규모 유역내 하천수 수질과 지질과의 상관관계 해석

  • 고경석;김재곤;이진수;김용제;조춘희
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2004.04a
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    • pp.311-314
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    • 2004
  • To identify the effect of geology and land use, the hydrogeochemical and multivariate statitstical analysis were executed for stream water collected in headwater region of Daecheong reservoir. Hydrogeochemical analysis was showed the effect of weathering process such as dissolution of calc-silicate minerals to hydrochemistry of stream water with contrasting geology. Cluster and principal components analysis can also help to identify the source of dissolved components in stream water.

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대전지역 약수의 수질특성과 관리방안

  • 정찬호;김은지;문병진
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2001.09a
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    • pp.15-18
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    • 2001
  • Sixty natural springs and wells used as community facilities for drinking water are developed along mountain climbing way of suburban area and residential area in Daejeon City. In this study, the seasonal variation of their water quality and hydrochemical characteristics were investigated. Some natural springs are vulnerable to bacilli contamination because of their short residence time and shallow circulation in subsurface environment. The waters show hydrochemical types of Ca-HCO$_3$ and Na-HCO$_3$, and are characterized by low electrical conductance and weak acidic pH.

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대표적 4개 오염지역의 수리지질 특성과 미생물학적 연구

  • 고경석;김재곤;조경숙;이상돈;염병우
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2004.09a
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    • pp.164-167
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    • 2004
  • To investigate the chemical and microbiological characteristics of groundwater and surface waters in contaminated sites, hydrochemical and microbial community analysis were executed. Different indigenous bacteria were observed at 4 contaminated sites and this is considered to decompose the contaminants of groundwater. The research results showed the close relationship between hydrochemistry and microbial characteristics and those are used for the information of natural attenuation and enhanced bioremediation.

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Hydrochemistry of Groundwater in the Uraniferous Sedimentary Rocks of the Ogcheon Belt, Republic of Korea (옥천대 우라늄 광화대 부근 퇴적암 지하수의 수리화학적 특성)

  • Hwang, Jeong
    • Journal of the Korean earth science society
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    • v.31 no.3
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    • pp.205-213
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    • 2010
  • A hydrochemical comparative study of groundwater in uraniferous sedimentary rock of the Ogcheon belt was carried out to investigate the genetic relationship between uraniferous groundwater of Daejeon area and uraniferous sedimentary rocks of the Ogcheon zone. The groundwater shows weak alkaline pH values rangingfrom 6.4 to 8.1 and low Eh values ranging from -50 to 225 mV. The groundwaters to Ca-$HCO_3$ type that shows high concentration of $Ca^{2+}$ and $HCO_3^_$ due to the dissolution of carbonate mineral in limestone. The concentration of uranium in the groundwater was measured very low below $3.2{\mu}g/L$, while it was detected as much as $1165{\mu}g/L$ in the mine waste water. The low Eh value of groundwater is one of the main causes of low uranium concentration of groundwater in uraniferous sedimentary rocks in the Ogcheon belt. It is suggested that the uranium of groundwater in granitic region of Daejeon area was not mainly provided from uraniferous sedimentary rocks in the Ogcheon belt.

A Study on Hydrochemistry Characteristics of Groundwater and Surface water near a Petroleum Contaminated area (유류오염지 주변 지하수와 지표수의 수화학적인 특성 연구)

  • Lim, Hong-Gyun;Lee, Jin-Yong;Park, Youngyun;Park, Yu-Chul
    • Journal of Soil and Groundwater Environment
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    • v.17 no.5
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    • pp.10-19
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    • 2012
  • The aim of this study was to examine chemical and isotopic compositions of groundwater and lake water near an area contaminated by petroleum and to evaluate influence of petroleum on them during the period from March to August 2011. In dry season, $Ca^{2+}$ and $SO{_4}^{2-}$ were dominant in the groundwater and lake water and $Ca^{2+}$ and $HCO{_3}^-$ were significant in wet season. ${\delta}^{18}O$ and ${\delta}D$ of the groundwater and lake water were plotted near LMWL (${\delta}D=8.06{\delta}^{18}O+12.5$). ${\delta}^{18}O$ and ${\delta}D$ of the lake water did not show seasonal variation. However, ${\delta}^{18}O$ and ${\delta}D$ of the groundwater were enriched in wet season compared with those in dry season because of influence of small ponds around wells where evaporation losses were slightly experienced. Redox condition of most lake water was oxidation environment in contact with the atmosphere during the study period. However, redox condition of groundwater was transitional environment in dry season and oxidation environment in wet season because of influence of contaminant such as petroleum. In some groundwater, the concentrations of $NO{_3}^-$ in some groundwater were less than 1 mg/L because of denitrification. Also, $NO{_3}^-$ showed positive correlation with $SO{_4}^{2-}$ and weak negative correlation with $HCO{_3}^-$, because of influence of denitrification.

포항지역 지열수의 수리지구화학적 특성

  • 고동찬;염병우;하규철;송윤호
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2004.09a
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    • pp.453-454
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    • 2004
  • Hydrogeochemical and isotopic characteristics were investigated for groundwater of Tertiary basin in southeastern part of Korea where deep drilling is in progress for geothermal investigation. According to geology, aquifer was distinguished as alluvial, tertiary sedimentary bedrock (bedrock groundwater), and fractured volcanic rock (deep groundwater). Groundwater of each aquifer is distinctively separated in Eh-pH conditions and concentrations of Cl, F, B and HCO$_3$. Deep groundwater has very low level 3H and 14C whereas alluvial groundwater has those of recent precipitation level. However one of deep groundwater show mixed characteristics in terms of hydrochemistry which indicates effect of pumping. Deep groundwater have temperature of 38 to 43$^{\circ}C$ whereas bedrock and alluvial groundwater have temperature less than 2$0^{\circ}C$. Fractured basement rock aquifer has different hydrogeologicalsetting from bedrock and alluvial aquifer considering hydrogeochemical and isotopic characteristics, and temperature.

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Estimation of Water Balance based on Satelite Date in the Korean Peninsula

  • Shin, Sha-Chul;Sawamoto masaki, Sawamoto-Masaki
    • Korean Journal of Hydrosciences
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    • v.8
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    • pp.97-110
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    • 1997
  • Quantifying water balance components is crucial to understanding the basic hydrology and hydrochemistry. An importance of water balace studies has been emphasized from the need to grasp the actual condition of water resources and environmental changes including climatic changes. This paper proposes a method for evaluating water balance components based on the vegetation monitor using remote sensing data. Here, the evapotranspiration model adopts a direct method by using NDVI(Normalized Difference Vegetation Index) calculated from NOAA/AVHRR data and a detailed descriptionof water balance by using the evapotranspiration over the Korean Peninsula. In the study, areal distribution data sets of water balance components are produced using NDVI and a simplified water balance model. This method enables one to discuss the hydrological problems for North Korea where insufficient meteorological and hydrological data exist. The results obtained indicate the specific regional features on water inventory and fluctuation in water balance.

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