36 



therein leads us to believe that the anemometer was mounted on a fixed 

 construction near the shore. The result obtained was presented in the form 

 of a one -dimensional energy spectrum (Figure 1) giving the energy of the 



Figure 1. Energy spectra of the downstream component of the wind velocity 

 fluctuation at a height of 1 to 2 m above the sea surface as a function 

 of the wave number k = 2Trf/u. Log- log plot. The run of 30 min. 

 duration is broken down into subsections of 10 min. each to show the 

 steadiness of the spectra. The straight line has a slope of -5/3 (from 

 Pond, Stewart, and Burling, 1963)- 



fluctuations in the downstream wind component as a function of wave number k 

 where 



k = 2ir f/u . (f = frequency of fluctuations, u = mean wind speed) 



The straight line corresponds to Kolmogorof f ' s theory of local isotropy 

 and - in the double-logarithmic graph - has a slope of -5/3 which says that 

 spectral energy density function goes with the -5/3 power of the wave 

 number. As it can be taken from the graph, the results provide further 

 support for Kolmogorof f ' s contention that there exists a universal form 

 to the high number part of the spectrum of high Reynolds number turbulence. 



A similar - as yet unpublished - result has kindly been communicated 

 to me by Brock and Hasse (I963) who recorded the horizontal and vertical 

 components of the wind speed and the air temperature as well. These 

 measurements were made by means of a buoy (Figure 2) carrying a stabilized 

 mast on which hot-wire anemometers and platinum resistance thermometers 

 as well as vertical accelerometer were mounted. The measuring site was 

 well away from land and - owing to the distance between buoy and research 



