Table 2 



Wave Data Availability 



Month 



Number of Data Records 



1990 



1991 



1992 



January 





248^ 



485" 



February 





224^ 



696" 



March 





248^ 



744" 



April 





240^ 



720" 



May 



194' 



248^ 



307" 



139= 



June 



237' 



240^ 



240' 



July 



245' 



171^ 



248' 



August 



243' 





248' 



September 



237' 





53' 



October 



248' 







November 



240' 







December 



46' 







207^ 







1 



' Deployment No. 1, Puv, 3-hr records. 



^ Deployment No. 2, Puv, 3-hr records, lower quality data. 

 ■* Deployment No. 4, DWG, 1-hr records. 

 ^ Deployment No. 5, Puv, 3-hr records. 



During the first short-term experiment in May 1990, one platform was 

 deployed, containing the following instrumentation (Figure 4): 



a. Vertical stack of optical backscatter sensors (OBS's) to measure the 

 vertical distribution of sediment concentration. 



b. Vertical stack of ECM's to measure the vertical distribution of 

 cross-shore and long-shore water velocities. 



c. Acoustic sonar altimeter to measure the distance to the seabed. 



d. SETRA strain-gage-type pressure sensor to measure the water level 

 elevations. 



e. Electronic compass to determine the platform orientation. 



/. Temperamre sensor used in calibration of other instruments. 

 g. Serial asynchronous unit (SAU) data collection system. 



The OBS's measure sediment concentration in the immediate vicinity of the 

 sensor head by measuring the backscatter intensity of an optical signal. Each 

 OBS was calibrated at CERC in a flowtank bodi prior to and following each 



14 



Chapter 3 MCCP Monitoring Plan and Implementation 



