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Classification of the Algal Monitoring Points by Histogram Analysis of Chlorophyll-a

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2020, 29(1), pp.37-44
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Received : October 30, 2019
  • Accepted : December 16, 2019
  • Published : February 29, 2020

Lee, Saeromi ORD ID 1 Changhyuk, Ahn 1 Jaeroh Park ORD ID 1

1한국건설기술연구원

Accredited

ABSTRACT

In this study, we analyzed the value of Chl-a by histogram to classify the points where algal management is required. The degree of algal bloom by point was analyzed using the ogive curve, and the algal control points were classified into three stages according to the shape of the frequency distribution table. Of the four major rivers, low concentration of Chl-a appeared most frequently in the Han River, while the high concentration of Chl-a was frequently found at the points of the Geum and the Yeongsan Rivers. In the case of the Han River, no apprehensive areas were found that require intensive management, while most points on the Geum and the Yeongsan Rivers required algal management. Finally, the Nakdong River basin was identified as points requiring algal management from the mid to downstream. The results of this study have confirmation of the possibility that the frequency distribution could be used as a supplementary indicator to express the algal bloom.

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