抄録
This study aimed to identify the origin of DOC loading, by which the extent of SUVA representing of humic content or aromaticity of natural organic matter, NOM concentration in lake, could be determined and the effect of hydraulics conditions on the dynamic behavior of SUVA in the Daecheong reservoir, Korea. The type of Daecheong reservoir was meso-stratified as the ratio of inflow rate to reservoir capacity, α, was under 10 but it was temporally classified into intermediate type during storm season by heavy rainfall. Over 90% of total DOC loading attributed to allochthonous sources in upstream and it concentrated in storm season. While, autochthonous DOC by production of algae in Daecheong reservoir appeared only in short period of algal bloom. And the proportion of autochthonous DOC to total organic carbon loading varied significantly depending on spatial locations but was not significant. The extent of SUVA in lake water depth was severely deteriorated by inflow rate and the location of intrusion of storm flows into lake layer during storm event because density of inflow storm water is usually heavier than that of the surface water. It has been found that SUVA in Daecheong reservoir strongly attributed to allochthonous DOC from upstream watershed.
