Ten-Minute Histogram of Raw ACP Data 



1200 



1000 



400 



200 - 



File #A0608 



signal at bin 1- 3. BASS I 

 signal at bin 32-34. BASS II 

 signal at bin 62-64, BASS III 

 signal at bin 93-95, BASS IV 



ttk 



rhH-r 



100 150 



Raw Signal (0-255) 



Figure 9-9. Histogram of the raw ACP signals at four BASS locations 



four BASS frames stacked in the profile. The time bytes represent day (which 

 is always one when the program is first run), hour, minute, and second; thus, 

 for each second there will be four records, like the one in the table, with the 

 same time numbers. 



Sample interpreted data 



ACP. The process of converting reflected acoustic intensity values 

 obtained from the ACP involves many steps before the values can be 

 described as suspended sediment concentration. Grab samples of the sedi- 

 ment-water mixture obtained during a wave run are examined for particle size 

 distribution as well as for total solids in the sample. The total solids per 

 volume is a background representation of the concentration which is used to 

 fine-tune the model used for the conversion of the raw acoustic signals (Lib- 

 icki, Bedford, and Lynch 1989). 



Chapter 9 The Ohio State University Measurements 



173 



