Abstract
Under growing wind-wave conditions the shear velocity,u*, over the water surface equalsg2Hs2Ba2Cp3, whereg is the gravitational acceleration,Hs is the significant wave height,Ba is a constant, andCp is the wave celerity. From an independent field experiment in a lake environment which provided all three parameters (u*,Hs, andCp), the value ofBa is found to be 0.89, which is slightly lower than but consistent (within 20%) with the literature value between 0.90 and 1.06 obtained from an oceanic environment. Since thisu* equation does not include the wind speed,U10, anotheru* formulation withU10 in addition to the wave information is also evaluated. It is shown that the latter equation which includesU10 is superior to the former withoutU10.
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