Abstract
A free-surface velocity divergence is highlighted as a key parameter of the gas transfer, because accurate divergence value can be obtained with advances of the PIV technique. However there still remain uncertainties about relation between free-surface divergence and gas transfer velocity in open-channel flows such as natural rivers. In this study, we conducted a horizontal free-surface PIV in laboratory flume together with DO measurements. A new physical model of gas transfer parameterized by the free-surface velocity divergence is proposed and this validity is examined intensively by comparison with present measured data.
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