To make surface seawater flow

the shear stress of the wind blowing on the sea must overcome the work of cohesion of seawaterW c. Oil film on the sea will drift along the wind direction so long as the shear stress of the wind overcomes the work of adhesion between the water and the oilW a or the work of cohesion of oil Wt

o. $$W_c = 2\sigma _{a

w} W_c = 2\sigma _{a

0} W_{c

o} = 2\sigma _{a

o} $$ Experiments bear out the theory that surface tension of seawater is more than twice that of oils generally

so that the wind influenced drift velocity of the oil film is over two times that of the wind-driven surface current. The wind factor for surface current in Jiaozhou Bay is 0.025

while those for the drift velocities of O-diesel oil film and the used light crude oil film are 0.070 and 0.052 respectively. Generally the primary factors influencing the movement velocity of oil film on the sea are current

wind

and the physicochemical properties of the oil. The drift velocity of oil film is determined from analysis of the work of adhesion between seawater and oil. Experiments and actual observations agree with the theoretical analysis.