Figure 31. Serial sequences of attenua- 

 tion, oxygen content, and depth of turbid 

 layer taken during the night of 2 August 

 1960. 



" 



<h ex DB/KYD ^ 



34% | 



Ss 





- Si 135% 



OXYGEN SATURATION 



150 



" \ | 



= NOTHING DONE TO SAMPLE 

 w = WALL WIPED 

 S. ,, T s = SAMPLE STIRRED _ 

 !V) / ( ) 3 -(-—), 3 MINUTES EARLIER 



1 /96vJ 

 1 / yM "5% 



100 



"J|I2%1 1 \ 



127%/ R \ 



50 



p| / \ 



Si 125% I 





>89^(. J?\ 



\f yyp^^*' 





\|22°/ 



T 8 ^. 125% * 



n 



20 



40 60 80 100 MINUTES 



Figure 32. Rapid serial sequence of 

 attenuation showing the effects of stir- 

 ring and other variables. 



86 





