낙동강 부영양화와 수질환경요인의 통계적 분석 (Eutrophication of Nakdong River andStatistical Analysis of Environmental Factors)

서지정보

· 발행기관 : 한국조류학회I
· 수록지 정보 : ALGAE / 17권 / 2호 / 105 ~ 115페이지
· 저자명 : 김미숙, 정영륜, 서의훈, 송원섭

초록

Influences of various environmental factors on the eutrophication of Nakdong River were analyzed statistically
using water samples collected from 1 January, 1999 to 30 September, 2001 at Namji area. The relationships between
the concentration of chlorophyll a (eutrophication index) and environmental factors and were analyzed to develop a
statistical model which can predict the status of eutrophication. The concentration of chlorophyll a ranged from 66.2
mg·m–3 to 70.8 mg ·m–3 during dry winter season and the average concentration during this study period was 35.5
mg·m–3. Namji area of Nakdong River was in the hypereutrophic stage in terms of water quality. Stephanodiscus sp.
and Aulacoseira granulata var. angustissima were dominant species during the winter to spring time and summer to
autumn period, respectively. Based on the correlation analysis and the analysis of variance between chlorophyll a
concentration and environmental factors, significantly high positive relationships were found in the order of BOD >
pH > COD > KMnO4 consumption > DO > conductivity > alkalinity. In contrast to these factors, significantly negative
relationships were found as in the order of PO4
3–-P > water level > the rate of Namgang-dam discharge > NH3-
N > the rate of Andong-dam discharge > the rate of Hapchoen-dam discharge. Based on the factors analysis of environmental
factors on the concentration of chlorophyll a, we obtained five factors as follows. The first factor included
water level, pH, turbidity, conductivity, alkalinity and the rate of Namgang-dam discharge. The second factor
included water temperature, DO, NH4
+-N, NO3
–-N. The third factor included KMnO4 consumption, COD and BOD.
The fourth factor included the rate of Andong-dam discharge, the rate of Hapcheon-dam discharge, and the rate of
Imha-dam discharge. The final factor included T-N, T-P and PO4
3–-P concentration. We derived two statistical models
that can predict the occurrence of eutrophication based on the factors by factor analysis, using regression analysis.
The first model is the stepwise regression model whose independent variables are the factors produced by factor
analysis : chl a (mg ·m–3) = 42.923＋(18.637 factor 3)＋(–17.147 factor 1)＋(–12.095 factor 5)＋(–4.828 factor 4). The
second model is the alternative stepwise regression model whose independent variables are the sums of the standardized
main component variables: chl a (mg ·m–3) = 37.295 + (7.326 Zfactor 3) ＋ (–2.704 Zfactor 1)＋ (–2.341
Zfactor 5).

영어초록

Influences of various environmental factors on the eutrophication of Nakdong River were analyzed statistically
using water samples collected from 1 January, 1999 to 30 September, 2001 at Namji area. The relationships between
the concentration of chlorophyll a (eutrophication index) and environmental factors and were analyzed to develop a
statistical model which can predict the status of eutrophication. The concentration of chlorophyll a ranged from 66.2
mg·m–3 to 70.8 mg ·m–3 during dry winter season and the average concentration during this study period was 35.5
mg·m–3. Namji area of Nakdong River was in the hypereutrophic stage in terms of water quality. Stephanodiscus sp.
and Aulacoseira granulata var. angustissima were dominant species during the winter to spring time and summer to
autumn period, respectively. Based on the correlation analysis and the analysis of variance between chlorophyll a
concentration and environmental factors, significantly high positive relationships were found in the order of BOD >
pH > COD > KMnO4 consumption > DO > conductivity > alkalinity. In contrast to these factors, significantly negative
relationships were found as in the order of PO4
3–-P > water level > the rate of Namgang-dam discharge > NH3-
N > the rate of Andong-dam discharge > the rate of Hapchoen-dam discharge. Based on the factors analysis of environmental
factors on the concentration of chlorophyll a, we obtained five factors as follows. The first factor included
water level, pH, turbidity, conductivity, alkalinity and the rate of Namgang-dam discharge. The second factor
included water temperature, DO, NH4
+-N, NO3
–-N. The third factor included KMnO4 consumption, COD and BOD.
The fourth factor included the rate of Andong-dam discharge, the rate of Hapcheon-dam discharge, and the rate of
Imha-dam discharge. The final factor included T-N, T-P and PO4
3–-P concentration. We derived two statistical models
that can predict the occurrence of eutrophication based on the factors by factor analysis, using regression analysis.
The first model is the stepwise regression model whose independent variables are the factors produced by factor
analysis : chl a (mg ·m–3) = 42.923＋(18.637 factor 3)＋(–17.147 factor 1)＋(–12.095 factor 5)＋(–4.828 factor 4). The
second model is the alternative stepwise regression model whose independent variables are the sums of the standardized
main component variables: chl a (mg ·m–3) = 37.295 + (7.326 Zfactor 3) ＋ (–2.704 Zfactor 1)＋ (–2.341
Zfactor 5).

참고자료

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