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DOI : 10.17640/KSWST.2014.22.6.155 , Vol.22, No.6, 155 ~ 166, 2014
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| Title |
| Characteristics Interpretation of Algae Occurrence Through the Complex Evaluation of Effect Parameters at Mulgeum in Nakdong River |
| 임지성 Ji Sung Lim , 이재호 Jae Ho Lee , 김영우 Young Woo Kim , 이병헌 Byung Hun Lee , 변임규 Im Gyu Byun |
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| Abstract |
| Nakdong River is one of the major river in South Korea. Downstream of this river is the intake station of big cities such as Busan. Algae occurrence in the river was one of problem for a long time. Thus, in this study, long term variation of chl-a and water quality, hydraulic and climate parameters were evaluated in winter and summer season at Mulgeum site in downstream the Nakdong River. Water quality, hydraulic and climate parameters are also used for determination of the parameters significantly affecting chl-a concentration by correlation analysis. As a result high concentration of chl-a has been appeared in winter season by bloom of diatom. Thus, control of algae occurrence at Mulgeum site in winter season is needed more than summer season. Inorganic nutrients and BOD5, pH, DO showed similar variation patterns to chl-a. The value of Hydraulic parameters were increased in summer by Monsoon season in South Korea. In this period, low concentration of chl-a was also caused by Monsoon season. With the result of correlation analysis between chl-a and the other parameters, ten parameters (BOD5, COD, DO, NO3-N, NH4-N, PO4-P, pH, discharge, water velocity and precipitation) showed significant correlation(p<0.05) in winter season. On the other hand, seven parameters (BOD5, DO, water temperature, pH, PO4-P, water velocity and water depth) showed significant correlation with chl-a in summer season. Therefore, we need to make a plan for control of algae occurrence through different significant parameters by seasonal change. |
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| Key Words |
| Algae, chl-a, Nakdong-River, correlation, Mulgeum site |
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