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- 저자 : Hyun-sup Ha(하현섭) (검색결과 2 건)
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Assessment of groundwater quality using statistical analysis in Incheon - focused on Gangwha area -
Hee-jong Yoo(유희종),Young-min Cho(조영민),Hye-rin Cho(조혜린),Sung-eun Min(민성은),Ji-hong Seong(성지홍),Hyun-sup Ha(하현섭),Mun-ju Kwon(권문주) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Naturally occurring radioactive materials (NORM) is widely distributed in groundwater of granite areas. Drinking of groundwater containing NORM such as uranium and radon is highly harmful to human health. The aim of this study is to determine the characteristics of groundwater quality with NORM and geostatistical analysis. Groundwater samples from 37 wells were collected and measured on 24 items of drinking water quality standards including radon and uranium in 2020. The average concentrations of uranium and radon in groundwater were the highest in granite area. Principal component analysis (PCA) showed that PC1 was highly enriched with Na<sup>+</sup>, K<SUP>+</SUP>, Mg<sup>2+</sup>, Ca<sup>2+</sup>, Cl<sup>-</sup>, SO<sub>4</sub><sup>2-</sup>, NO<sub>3</sub><sup>-</sup>, HCO<sub>3</sub><sup>-</sup> and Sr (40.6 %) strongly associated with soluble ion materials. Both PC2 with F<sup>-</sup>, U and Gross alpha (20.3 %) and PC3 with Rn (8.5 %) was related to NORM. PC4 was enriched with Zn (7.0 %). Cluster analysis (CA) revealed three subgroups showing high relationship between Na<sup>+</sup> and Cl<sup>-</sup> of main soluble ion constituents in seawater. This study coupled with statistical analysis is expected to imply appropriate contamination control management for safety of drinking groundwater.
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신문기,이충대,하현섭,최춘석,김용희,Shin, Moon-Khee,Lee, Choong-Dae,Ha, Hyun-Sup,Choe, Choon-Suck,Kim, Yong-Hee 한국대기환경학회 2007 한국대기환경학회지 Vol.23 No.3
In this study, we have analyzed $PM_{10}$ concentration measured at Incheon Regional Air Monitoring Network (10 stations) and meteorological data at Incheon Weather Station to investigate factors (i.e. wind direction, wind speed, relative humidity, major meteorological phenomenon, and sea-land breezes existence) influencing $PM_{10}$ concentration in Incheon during 2005. Statistical differences among meteorological factors were assessed by Kruskal-Wallis test or Mann-Whitney U test. The main conditions causing high $PM_{10}$ concentration are summarized below; 1. When westerly wind prevailed (however, $PM_{10}$ decreased when winds were blowing from the east or north). 2. When the winds were calm, owing to accumulation of nearby emissions under stagnant conditions, or when the wind speed is in excess of 6 m/s, which shows the effect of fugitive dust produced by wind erosion. 3. Under the condition of high relative humidity and poor diffusion based on meteorological phenomenon such as fog, mist, and haze. 4. When the Sea-Land breezes existed, which occurred 70 days in Incheon during 2005 and contributed significantly to high $PM_{10}$ concentration in the coastal urban area. In conclusion, we have found that the meteorological factors have influence on $PM_{10}$ concentration in Incheon.
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