Observed relationship between the drag coefficient, Cd, and stability parameter, (=zL).

概要

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Momentum and heat flux were measured with a sonic anemometer at the Marine Observation Tower in the port of Ito. Under unstable conditions (Tw-Ta=3°C-4°C), using the eddy correlation method, results show thatCd=(1.2±0.3)×10-3andCh=(1.5±0.3)×10-3 at 5.5 m above mean sea level except for the case of weak winds. An unexpected relationship betweenCdand (-z/L) was observed, that is, Cddecreases as (-z/L) increases. If roughness variation over the sea is taken into account, we can explain the decrease in the range of (-z/L) less than 1, but not in the range greater than 1. This is due to a strong instability effect and the change of roughness class, from moderately rough to smooth.
日本海洋学会の論文