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KMID : 1024520090180121383
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Journal of the Environmental Sciences
2009 Volume.18 No. 12 p.1383 ~ p.1390
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A Study on the Water Quality Characteristics of the Reservoirs in Gwangju City
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Kim Dong-Soo
Park Jong-Tae
Park Jong-Hwan
Kim Yeon-Hee
Song Hyeong-Myeong
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Abstract
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This study was performed to investigate the physico-chemical properties and phytoplankton concentration from February to December, 2007 in Gwangju area reservoirs. Water samples from 20 reservoirs were analyzed. As results of the water quality analysis, the average pH was 7.6 and annual pH were 6.3 ～9.6. The higher pH of 8.6 ～ 9.6 were showed from March to August due to eutrophication. Chlorophyll-a concentration ranged from 0.4 to 164.3 mg/㎥. The highest chlorophyll-a concentration was observed in August. BOD was correlated with SS, T-N, and Chlorophyll-a(R=0.82, 0.90 and 0.84) respectively. COD was correlated with BOD, SS and Chlorophyll-a(R= 0.89, 0.77 and 0.76) respectively. The T-N/T-P ratios were 4～281, so phosphorus was considered to be the limiting factor in most of points. The trophic state showed eutrophicate states in Gwangju reservoirs. Therefore it was necessary to monitor continuously. In order to monitor the reservoirs, an algae prediction system must be used.
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KEYWORD
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T-N, Algae, Chlorophyll-a
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