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http://dx.doi.org/10.7837/kosomes.2016.22.7.854

Hypoxia and Characteristics of Nutrient Distribution at the Bottom Water of Cheonsu Bay Due to the Discharge of Eutrophicated Artificial Lake Water  

Lee, Dong-Kwan (Department of Oceanograhpy and Ocean Environmental Sciences, Chungnam National University)
Kim, Ki-Hyun (Department of Oceanograhpy and Ocean Environmental Sciences, Chungnam National University)
Lee, Jae-Sung (Korea Institute of Ocean Science & Technology)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.22, no.7, 2016 , pp. 854-862 More about this Journal
Abstract
In summer 2010, we measured the concentration of dissolved oxygen (DO) and nutrients in the water collected at the bottom of Cheonsu Bay, off the west coast of Korea. We also measured nutrient fluxes across the sediment-water interface by deploying a fully-automated benthic lander, which collected time-series water samples inside a benthic chamber. We confirmed on-going hypoxia in the northern parts of the bay where polluted lake water was discharged. DO content in the water at the bottom was 2 mg/l, compared to 5 mg/l at the mouth of the bay in the south. Nutrient concentrations showed a trend that was opposite to that of DO. The variation of N/P ratios implies phosphate desorption and a release of nutrients caused by hypoxia. The organic carbon oxidation rate and oxygen consumption rate in the northern parts of the bay were about twice as fast as those at the mouth of the bay. Benthic fluxes of nutrients in the northern part of the bay were 4 to 6 times higher than those at the mouth. Our results imply that it is important to understand the role of hypoxia events to make an accurate estimation of material fluxes across the sediment-water interface.
Keywords
Hypoxia; Eutrophicated water; Dissolved oxygen; Benthic flux; Cheonsu Bay;
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Times Cited By KSCI : 8  (Citation Analysis)
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