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http://dx.doi.org/10.7846/JKOSMEE.2014.17.4.306

Estimation of Addition and Removal Processes of Nutrients from Bottom Water in the Saemangeum Salt-Water Lake by Using Mixing Model  

Jeong, Yong Hoon (Department of Oceanography, Kunsan National University)
Kim, Chang Shik (Coastal Disaster Research Center, Korea Institute of Ocean Science & Technology)
Yang, Jae Sam (Department of Oceanography, Kunsan National University)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.17, no.4, 2014 , pp. 306-317 More about this Journal
Abstract
This study has been executed to understand the additional and removal processes of nutrients in the Saemangeum Salt-water Lake, and discussed with other monthly-collected environmental parameters such as water temperature, salinity, dissolved oxygen, suspended solids, and Chl-a from 2008 to 2010. $NO_3$-N, TP, $PO_4$-P, and DISi showed the removal processes along with the salinity gradients at the surface water of the lake, whereas $NO_2$-N, $NH_4$-N, and Chl-a showed addition trend. In the bottom water all water quality parameters except $NO_3$-N appeared addition processes indicating evidence of continuous nutrients suppliance into the bottom layer. The mixing modelling approach revealed that the biogeochemical processes in the lake consume $NO_3$-N and consequently added $NH_4$-N and $PO_4$-P to the bottom water during the summer seasons. The $NH_4$-N and $PO_4$-P appeared strong increase at the bottom water of the river-side of the lake and strong concentration gradient difference of dissolved oxygen also appeared in the same time. DISi exhibited continuous seasonal supply from spring to summer. Internal addition of $NH_4$-N and $PO_4$-P in the river-side of the lake were much higher than the dike-side, while the increase of DISi showed similar level both the dike and river sides. The temporal distribution of benthic flux for DISi indicates that addition of nutrients in the bottom water was strongly affected by other sources, for example, submarine ground-water discharge (SGD) through bottom sediment.
Keywords
Saemangeum saltwater lake; Nutrient; Addition; Removal; Mixing model;
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