• Journal of Environmental Impact Assessment
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• v.8 no.4
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• pp.37-45
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• 1999

Juam Lake is a major water resource for the industrial and agricultural activities as well as for the resident life of Kwangju and Chonnam regions. However, the water quality of the lake is getting worse due to a large quantity of pollutant inflowing to the lake. The excessive growth of algae by the overfertilization may result in water treatment problems and also the interference with desirable water uses of navigation, aesthetics, recreation and fish maintenance. Therefore, the purpose of this study is to analyze algal species and movements in Juam Lake in order to use as basic data in making the countermeasure to achieve the water quality goal of the lake. The results of the analysis show that (1) the predominant species of algae are Microcystis aeruginosa, Anabaena affinis, Melosira granulata, Synedra acus, and Coelastrum cambricum, (2) their groups are changed in order of diatoms, green algae, and blue-green algae with the lapse of time, and (3) the distance of the vertical movements of algae for 24 hours is about 2m.

• Journal of Environmental Impact Assessment
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• v.9 no.4
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• pp.291-300
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• 2000

Juam lake is a major water reservoir for the industrial and agricultural activities as well as the residental life of Kwangju and Chonnam regions. However, the water quality of the lake is getting worse due to a large quantity inflowing to the lake. The excessive growth of algae by the overfertilization may result in water treatment problems and also the interference with desirable water uses of navigation, aesthetics, recreation, and aquatic ecosystem. Thus the purpose of this study is to investigate the species and their amount of planktons in the lake and the relationship between the P loading amount and the chlorophyll-a used as a primary productivity index. The results of the investigation show that (1) the predominant species of algae are Microcystis aeruginosa, Anabaena affinis, Melosira granulata, Synedra acus, and Coelastrum cambricum, (2) the trophic state of the lake can be classified as eutrophic, and (3) there is close relation between the P loading amount and the chlorophyll-a.