Abstract
In this study, the amount of nitrous oxide (N2O) emissions from the vicinity of a dune was measured to investigate the effects of the bedform on N2O emissions. N2O emissions over time around a dune were analyzed and the correlation between N2O emissions and water quality were evaluated. As a result, N2O emissions at the dune crest were 2.8 times higher than that in the flat bed and N2O emissions at the hill and slopes were 2.2 times and 3.8 times higher than those in the flat bed, respectively. Also, it was confirmed that N2O emissions at the different locations of the dune increased or decreased over time after the supply of the discharge. N2O emissions measured at the hill of the dune were the largest, which were increased from 2.97 to 13.9 μg N/m²/h. N2O emissions have tended to be increased in the hills, crests and slopes of the dune and be decreased in the flat bed. This study can be used as a fundamental data to evaluate the potential greenhouse gas emissions in the river system indirectly. Key words: Hyporheic Zone, Greenhouse Gas, Nitrous Oxide, Bedform, Dune
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