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KMID : 0382420000260040097
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 4 p.97 ~ p.104
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A Study on Phosphorus Loading model for Eutrophication Response in the Yongsan Lake
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Ryu Il-Kwang
Lee Chi-Young
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Abstract
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The purpose of this study is made an examination of phosphorus loading model for eutrophication response in the Yongsan lake. For the model, we measured the total amount of nutrients derived from the Yongsan river watershed, inflow rate to the Yongsan lake, water quality, and water budget from January to December in 1999. The total amount of precipitation in the Yongsan river watershed was 4,951.7 × 10 exp(6) ㎥/y and inflow amount was 2,569.7 × 10 exp(6) ㎥/y, therefore the outflow rate of the Yongsan river watershed was 51.9%. The develop loading of total nitrogen was 86,928.1 kg/d and that of total phosphorus was 22,007.6 kg/d at the Yongsan river watershed, But, as the inflow loading of total nitrogen was 33,962 kg/d and the inflow loading of total phosphorus was 2,218 kg/d to the Yongsan lake. so each inflow rate was 39.0% and 10.1%. The hydraulic residence time was 34days, total phosphorus loading [L(P)] on the surface area was 23.398 g/㎥/y, the hydraulic load(Q_s) of inflow water was 74.269 m/y, the reserve rate of phosphorus in the lake was 0.359, and the settling velocity of phosphorus was 0.114 m/d at the Yongsan lake. Mathematical model of phosphorus loading to estimate the responses of eutrophication at the Yongsan lake is [P_j] = 0.838 [L(P)/Q_s·(1+√T_w)^-1]
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KEYWORD
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