Enhanced Benthic Nutrient Flux During Monsoon Periods in a Coastal Lake Formed by Tideland Reclamation |
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| Authors: | Seok-Hwi Kim Kangjoo Kim Minhyung Lee Hwa-Jin Jeong Won-Jang Kim Jong-Gyu Park Jae-sam Yang |
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| Institution: | (1) Department of Environmental Engineering, Kunsan National University, Jeonbuk, 573-701, Korea;(2) Korea Rural Community & Agricultural Corporation, 576-804 Jeonbuk, Korea;(3) Department of Oceanography, Kunsan National University, Jeonbuk, 573-701, Korea; |
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| Abstract: | Sediment and water quality were investigated in an artificial coastal lake (Saemangeum Lake, Korea) that was formed by constructing
a 33-km long sea-dyke offshore from the mouths of two adjacent rivers, which discharge into the Yellow Sea. Sediment showed
drastic increases in fine fraction (silt and clay) after the dyke construction. TN, TP, and OC contents in the sediment showed
the similar spatial variation to that of fine fraction. A mixing model indicated benthic fluxes of nutrients such as PO4, NH4, and SiO2, which were considerably elevated during the summer monsoon season. It is revealed that this phenomenon was associated with
the development of strong salinity stratification, elevated water temperature, and increased groundwater discharge. However,
a change in the sedimentation environment due to dyke construction is suggested as the primary reason for the enhanced benthic
fluxes. |
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