

390 

























































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Figure 10-6. Uncalibrated OBS signal from 56 cm above the bed 

























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Figure 10-7. Observed ripple pattern 



Several of the statistical values listed should be used with care due to 

 peculiarities of the measurement systems. First, data calibrated from the pore 

 pressure sensor contain spikes that one can easily identify, but cannot be as 

 easily identified by a computer algorithm. The presence of these spikes in the 

 data set can cause disagreement between the listed statistics and the statistics 

 computed after their removal. Second, due to large particulate matter in the 

 water, the signals from the OBS also contain spikes. The maximum value 

 probably represents data collected from such an event. Also, because the 

 background concentration has already been subtracted, the minimum value 

 from the OBS sensors is not representative of the background. The 

 background value subtracted from the signal is also given. Finally, what has 

 been listed as the vf-flow velocity component may contain some portion of the 

 H-velocity component due to a slight rotation of the EMCM during 

 deployment. 



Chapter 10 Intermittent Near-Bed Sediment Suspension 



203 



