KMID : 1024520030120070689
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Journal of the Environmental Sciences 2003 Volume.12 No. 7 p.689 ~ p.695
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The evaluation of the eutrophication for the lakes by phosphorus loading
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Kim Jae-Yun
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Abstract
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The purpose of this study is to evaluate and to predict of eutrophication in lakes by using Vollenweider-OECD model and total phosphorus concentration and inflow rate which were measured in 1993¡2001. The results of study were as follows. The annual total phosphorus loading from the watershed was calculated to be 55¡195tP/yr at lake Soyang, 221¡466tP/yr at lake Taechong, 123¡278tP/yr at lake Andong, 57¡109tP/yr at lake Seomjin. These are discharged, far the most parts, from population and fishfarm facility. TP loading on the surface area at lake Soyang was 3.01gP/§³/yr, 2.82gP/§³/yr, 2.84gP/§³/yr, 3.03gP/§³/yr, 2.34gP/§³/yr, 1.78gP/§³/yr, 0.91gP/§³/yr, 0.89gP/§³/yr, 0.86gP/§³/yr, lake Taechong was 6.71gP/§³/yr, 7.25gP/§³/yr, 7.24gP/§³/yr, 6.53gP/§³/yr, 6.50gP/§³/yr, 7.06gP/§³/yr, 7.04gP/§³/yr, 4.05gP/§³/yr, 3.44gP/§³/yr and TP loading on the surface area of lake Andong, lake Soemjin were 5.39gP/§³/yr, 4.47gP/§³/yr, 4.56gP/§³/yr, 4.45gP/§³/yr, 3.33gP/§³/yr, 2.38gP/§³/yr, 2.53gP/§³/yr, 2.46gP/§³/yr, 2.54gP/§³/yr, 4.09gP/§³/yr, 4.10gP/§³/yr, 3.98gP/§³/yr, 3.73gP/§³/yr, 2.80gP/§³/yr, 3.46gP/§³/yr, 3.22gP/§³/yr, 2.19gP/§³/yr, 2.13gP/§³/yr respectively. The tropic states of four lakes can be assessed as eutrophy because phosphorus leading exceeds the critical phosphorus loading by Vollenweider-OECD model.
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KEYWORD
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Eutrophication, Vollenweider-OECD model, Total phosphorus loading, Critical phosphorus loading
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