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KMID : 1024520000090050369
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Journal of the Environmental Sciences
2000 Volume.9 No. 5 p.369 ~ p.374
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The numerical simulation on variation of phytoplankton maximum region in the estuary of Nakdong river -I. The state of variation of phytoplankton maximum region-
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Lee Dae-In
Hong Suk-Jin
Lee Suk-Mo
Park Chung-Kil
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Abstract
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The estuary of Nakdong river is very influenced by the freshwater contained nutrients and organic materials. The response results of these influences are eutrophication and red tide outbreak in this region. Concentration of chlorophyll a was 0.78~62.55/L in February 1.20~21.29/L in April 1.88~188.35/L in June and 0.78~11.21/L in August respectively. The decrease of chlorophyll a is considered that residence time is shorten by increase of freshwater discharge and unfavorable growth condition of phytoplankton is created by diffusion of low salinity and increase of turbidity. The phytoplankton maximum region located inner side of this estuary during winter season whereas it was moved to outer side when mean discharge of the Nakdong risver was increased, Therefore the variation of phytoplankton maximum region was affected by input discharge from the Nakdong river basin.
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KEYWORD
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Eutrophication, Red tide, Residence time, Freshwater discharge, Phytoplankton maximum region
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