TM No. 377 



w Mean value of w(t) 



w' variance of the record w(t) = o^ 



w(t) Time variable velocity in Z direction (+ upward) = w 



Wiji(x o ,Z,t) Deviation of the theoretical vertical velocity component 

 about a zero mean 



2 

 Xp Chi -square distribution 



Z(K) In -phase energy spectrum or co -spectrum 



GREEK SYMBOLS 

 e Turbulent energy transfer dissipation of small scale motions 



3 





Particle displacement in vertical direction (chapter 2) 



Current speed (chapter k) 



Dynamic viscosity (chapter 2) 



Time variable position of free surface on vertical wave staff 



Mean free surface 



Instantaneous deviation from the mean v^ 

 Ia Dynamic viscosity in air 



1y Dynamic viscosity in sea water 



^ Phase difference between u(t) and w(t) 



<S> (K) Series approximation of the phase lead of u^ over w n 

 9 Inclined angle lying in the vertical XZ plane (chapter 2) 



9 Estimated direction of wind waves (sea) or swell 



Dimensionless scale factor 



X 



|i Kinematic viscosity 



C Particle displacement (horizontal direction) 



xix 



