Inspection of the time series plots revealed spikes in the OBS record creat- 

 ed by single outlying points. It is believed these points were caused by noise 

 on the data lines and not by rapid fluctuations in concentration. To remove 

 outlying points, the data were filtered using a program which identifies the 

 doubtful point and replaces it with a value interpolated from the adjacent data. 



Basic statistics were calculated for the sensors in the mobile OBS array. 

 The mean and standard deviation for each sensor are presented tabularly in a 

 ledger file that accompanies each of the data files. Also included in the ledger 

 file are instrument positions, start and stop times, and descriptive information. 



Conversion of raw data from the capacitance wave gauge to scientific units 

 was performed during the collection process. The software used to interface 

 the gauges and the data collection system, LabTech Notebook, allowed for 

 calibration constants and offsets to be updated prior to each run. Original 

 wave gauge data files contain a header that provides information about the run 

 and the column of wave gauge data. The original data files are in ASCII for- 

 mat and required no post-processing or reduction. 



Data file format 



Table 7-2 presents a 1-sec segment of the data file A1314AOB.CON. 

 These data have been converted according to Equation 7-1, and no filtering 

 has been performed. The first column is the time in seconds from midnight 

 Pacific Daylight Time. For example, 53070.0 sec from midnight is 

 14:44:30.0 on the 24-hr clock. The second, third, fourth, fifth, and sixth 

 columns are converted data for sensors AAA, BBB, CCC, DDD, and EEE, 

 respectively. Figure 7-3 graphically presents a 15-sec segment of sensor AAA 

 output from the file A1314AOB.CON. The 1-sec segment of data presented 

 in Table 7-2 is contained within this larger segment. 



Table 7-2 



Sample of Converted, Raw Data 



Time, oec 



C. git 



AAA 



BBB 



CCC 



DDD 



EEE 



53070.0 



3.95623 



2.87198 



3.59375 



2.87415 



2.87850 



53070.1 



4.44285 



4.43150 



3.20313 



2.87415 



1.99871 



53070.2 



43.37254 



4.67774 



5.31250 



1.55169 



1.11893 



53070.3 



5.17278 



3.03614 



4.45313 



1.66189 



1.75877 



53070.4 



3.46961 



2.70782 



2.42188 



2.21292 



1.35887 



53070.5 



2.98299 



2.78990 



2.57813 



1.99251 



1.43885 



53070.6 



2.98299 



2.87198 



2.96875 



2.98435 



1.59881 



53070.7 



2.98299 



2.46158 



2.42188 



2.76394 



1.51883 



53070.8 



2.49637 



2.87198 



2.57813 



2.43333 



1.43885 



53070.9 



3.46961 



4.02110 



2.96875 



3.86599 



2.15867 



130 



Chapter 7 Sediment Suspension Measurements from a Platform 



