ko 



but solid wall in the institute of Prandtl. According to Schooley's find- 

 ings (Figure 5) the flow has a maximum speed which occurs at about 1.5 to 

 2.5 cm above the water surface. This jet" effect, as it is called by 

 Schooley, points to a systematic deviation from the log-profile at a level 

 of about 1.5 to 2.5 wave heights above the surface. This could be of 

 importance as will be explained later. 



2 3 4 5 6 7 8 9 10 11 12 

 HORIZONTAL WIND SPEED (METERS/sec) 



Figure 5- Vertical wind profiles above four different points along a 

 water wave' showing a maximum velocity just above the boundary layer, 

 (from Schooley, I963) 



On the whole, laboratory measurements seem to be very promising, in 

 particular for developing and checking theoretical models. I have been 

 told that a study on the instantaneous wind field around moving water waves 

 is being made at the National Center for Atmospheric Research by means of 

 a rather sophisticated equipment. The results aspired to will be of great 

 interest. 



