Journal of the Korean Society of Environmental Restoration Technology (한국환경복원기술학회지)

The Korea Society of Environmental Restoration Technology (한국환경복원기술학회)
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Causes and Overcoming of the Algae Excess in a Dam Water - Based on the Data of Water Quality Analysis of Mulgum Area -

댐호화된 하천의 조류 과다 발생원인과 해소 방안 - 낙동강 물금 지역의 수질 분석 데이터를 중심으로 -

  • Yang, Shi-Chun (Aquosys Co.) ;
  • Xia, Tian-Tian (Dept. of Landscape Architecture, Graduate School, Dongguk University) ;
  • Kang, Tai-Ho (Dept. of Landscape Architecture, Dongguk University Gyeongju Campus)
  • 양시천 ((주)한국아쿠오시스) ;
  • 하첨첨 (동국대학교 대학원 조경학과) ;
  • 강태호 (동국대학교 경주캠퍼스 조경학과)
  • Received : 2016.11.14
  • Accepted : 2017.08.03
  • Published : 2017.08.31
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Abstract

The purpose of this study is to analyze a term of decade of water quality data of the Mulgum intake station on the Nakdong river(dam) to find the cause of algal blooms and to set an alternative to prevent artificial lake water pollution. Our study shows that water quality changes have regular periodic regularity and there was a certain correlation between specific analytical items. According to the analysis results of each factor, the decline in precipitation was not the main reason for algal blooms. TP concentration had a slight effect on Chl-a concentration but was not a limiting nutrient of a bloom. TN concentration had a strong correlation with Chl-a and strongly negative correlation with temperature, but was not a bloom's limiting nutrient, and was only a dependent variable. As the temperature was negatively correlated with the Chl-a concentration, it is found that the aspect of the ecological influence of the temperature was the most important factor of the phytoplankton concentration change. The N/P ratio lies under a power function with a high degree of reliability by the TP concentration, and the phenomenon appeared to be the same as the results of two other comparative areas. This result confirms that TN is dependent on TP and the biota in the lake that TN is a dependent variable whose concentration is determined by TP it. In conclusion, the increase in lake bloom is the result of a food chain change, and it is necessary to control the ecosystem by the food chain in the lake in order to reduce the lake's bloom. In particular, it is important to keep the benthic ecosystem as wide as possible in the aerobic state.

Keywords

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