10 15 20 25 30 35 40 



2 c 



Fig. 7. Resistance coefficient (y = 5") at the sea surface 



p 'v* 



as a function of wind velocity (W m/sec), according to 

 slope-observations (wind set up) and wind profile 

 measurements, (After G. Neumann, 1951). 



He finally comes to the rather disappointing conclusion that at 

 no wind speed is the stress (or the resistance coefficient) known 

 confidently to within half its value. 



At present, a new, direct approach for measuring the inter- 

 facial stress at the sea surface is being undertaken by L.A.E. Doe 

 as part of this project. It is hoped to derive the surface stress 



40 



