So for the July 1991 and January 1992 experiments, two sleds (referred to as 

 Sleds 1 and 2), instrumented with equipment similar to that of the platform, 

 were added to the monitoring program (Figure 5). The platform was deployed 

 at various locations in the surf zone on a daily basis throughout each of the 

 three experiments. Table 3 provides platform deployment information 

 (i.e. dates and locations) for the 1991 and 1992 experiments. The longshore 

 locations in Table 3 are defined later in this chapter. Sleds 1 and 2 were 

 continuously deployed in deeper water locations for periods ranging from 3 to 

 6 days. Table 4 provides deployment information for Sleds 1 and 2. Figure 2 

 shows the reference lines for positions within the impoundment basin. 



Figure 5. Instrumented sleds (photo by T. E. White) 



Acoustic Doppler Current Profiler. During the first short-term 

 experiment, a 1 ,200-kHz narrow-band ADCP was deployed in the Colorado 

 River mouth (see Figure 3). The ADCP consists of four transducers arranged 

 on one sensor. The transducers were oriented 30 deg relative to the vertical, at 

 90-deg azimuth intervals and when deployed, transmitted short acoustic pulses 

 along narrow beams at a fixed frequency. Sound was returned (backscatter) to 

 the transducers along the beams from small particles (scatterers) such as 



16 



Chapter 3 MCCP Monitoring Plan and Implementation 



