1 



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0.5 



















/ 



O 

 0.5 



/ 



\ 



/ x 



x --' 



\ 

 \ 

 \ 



— 







/ 



\ r"' 



\y 



Figure 10-13. Detrended ripple pattern 



























1 400 



- 

















\ 









1 200 



- 

















\ 

 1 







w 



1 OOO 



- 

















! 



! 



- 





" 



aoo 



600 



400 

 200 

















/ 



j 



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1 c 









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>o 



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1 50 



200 



250 



300 



35Q 



400 450 



500 



550 



6C 













mm 



from 



ACM 









Figure 10-14. Calibrated ACP mean profile 



The ACP data files have background concentration profiles and mean 

 concentration profiles with and without subtraction of the background 

 concentration as shown in Table 10-3. Some of the mean profiles without 

 subtraction of the background show a bump which is caused by the partial 

 reflection of the sonar beam from the OBS body. Some of the bumps were 

 almost eliminated by subtracting the background from the mean concentration 

 profile. The mean concentration profiles subtracted by the background are 

 valid up to the smaller bottom bin number between those of the background 

 and mean signal profiles. 



206 



Chapter 10 Intermittent Near-Bed Sediment Suspension 



