Internal Waves 



525 



and 



U' 



U 



(XVI. 21) 



The order of magnitude of these velocities can be found by calculating 

 a numerical example: If q = 1025, q— q' = 10 -3 , g = 981 cm sec -2 , h' = 50 m, 

 h = 200 m and Z = 15 m. Then U' = 18 6 cm/sec and U = 4-7 cm/sec. This 

 shows that, already with; internal waves of a moderate amplitude, the hori- 

 zontal particle velocities are relatively large, which can be observed without 



, o C 



£ 150 



'23-6 24-0 



26-0 



27-C 



I— I — I 1 — i — i — i — i — i — i i i i i i i i | i 



34-5 35-0 35-5 360 



S, %<, 



Fig. 215. Vertical distribution of temperature, salinity and density <7< at the "Meteor' 



Anchor Station 254. 



any difficulties by current measurements. The corresponding velocity of 

 progress of the internal wave is here 63 cm/sec, that of the ordinary long 

 wave at the free surface 4953 cm/sec. Following is an example of these in- 



