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A new model accounting for both turbulence and sea state effects has been proposed in the current paper to describe momentum exchange through air-sea interface. While long wave components mainly change air flow profile, short wave components exert their influences on the momentum exchange via turbulent stress, which leads to the growth of drag coefficients by a factor of two in young wave age circumstances. As a typical case study, we have considered neutral ABL over a representative regular wave with roughness due to short capillary waves riding over it. The results by the present model are in reasonable agreement with Maat’s analysis numerically fitted by HEXMAX data and Janssen’s results. Two parameter dependence of drag coefficient can resolve the existing discrepency between theory and observations.
A new model accounting for both turbulence and sea state effects has been proposed in the current paper to describe momentum exchange through air-sea interface. While long wave components mainly change air flow profile, short wave components exert their influences on the momentum exchange via turbulent stress, which leads to the growth of drag coefficients by a factor of two in young wave age circumstances. As a typical case study, we have considered neutral ABL over a representative regular wave with roughness due to short capillary waves riding over it. by the present model are in reasonable agreement with Maat’s analysis numerically fitted by HEXMAX data and Janssen’s results. Two parameter dependence of drag coefficient can resolve the existing discrepency between theory and observations.