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Changes in the Concentrations and the Characteristics of Organic Carbon After Entrance into Dam Reservoirs  

Shin, Jae-Won (Department of Environment and Energy, Sejong University)
Lee, Bo-Mi (Department of Environment and Energy, Sejong University)
Hur, Jin (Department of Environment and Energy, Sejong University)
Park, Ji-Hyung (National Institute of Environmental Research)
Publication Information
Journal of Korean Society on Water Environment / v.29, no.1, 2013 , pp. 81-87 More about this Journal
Abstract
Changes of organic carbon after the entrance into dam reservoirs were investigated using water samples collected in May, September, and October in 2010 from the inflow sites and the outlets of four selected dam reservoirs-Soyang, Chungju, Chungju regulation, and Uiam. Increase of refractory dissolved organic carbon (R-DOC) was observed only for large dam reservoirs with long residence times whereas the trend was not found for relatively small reservoirs. The effects of residence times on organic carbon changes were further confirmed by significant positive correlations between monthly residence times and the relative increase of either dissolved organic carbon (DOC) or R-DOC concentrations. Comparison of spectroscopic characteristics of DOC revealed that the changes in the large reservoirs in May might result from in-lake processes. The inflow of terrestrial sources of DOM during storms appears to largely affect the DOC quality of the large reservoirs for the rest of the sampling periods. The mechanism, however, did not fully explain the behaviors of DOC for the small sized reservoirs. Our combined results suggested that both residence time and the input of allochthonous carbon sources might substantially influence the quantity of DOC as well as its quality in dam reservoirs.
Keywords
Allochthonous; Autochthonous; Dam reservoirs; Refractory organic carbon (R-OC); Residence time;
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