TM No. 377 



T r Time constant (appendix B) 



Tg Time interval or strip chart length - proportional to chart 

 speed (chapter 2) 



Tg Period over which time average is made 



Tg Surface tension (chapter 5) 



Ty Time constant in sea water 



t Time 



u Horizontal velocity component = u(t) 



u Mean value of u(t) 



2 2 



u' variance of the record u(t) = a u 



u Q Amplitude (Kg/l) 



u(t) Time variable velocity in x direction = u 



u(0) Fluid velocity sensed by impeller 



u| Any time variable fluctuation (except u^.) 



uj Time variable oscillatory motion caused by waves 



u'w' Covariance function between u' and w' at zero lag =0 (0) 



W vector velocity 



V]_ , V2 ■> • • V n Veloc ity-t ime data 



Vg Recorded wind speed 



V(K) Series approximation of auto-spectrum 



Vj^ Corrected wind speed 



Viji Towing speed 



V(t) Voltage fluctuation with time 



W(K) Out-of-phase energy spectrum or qua-spectrum 



w Vertical velocity component = w(t) 



xviii 



