total record, given in the last column. Typically, the two means differ 

 substantially, indicating that it is important to use values of forcing 

 functions pertaining to the exact time of the sand transport rate measurement. 

 Most x-components of the mean current are positive, indicating that the flow 

 was directed offshore at an elevation of approximately 20 cm from the bed 

 where the current meter sensors were located. In general, the cross -shore 

 flow was relatively weak. The standard deviations of the flow and magnitudes 

 of the maximum and minimum speed are much greater for the cross -shore flow 

 than for the longshore flow, as expected. Although the longshore (y-com- 

 ponent) currents had substantial minima (negative values), these were 

 manifested as sharp peaks in records that otherwise showed consistent trends 

 for unidirectional flow to the north. In fact, the streamers were never 

 observed to reverse direction during the runs. 



Waves and Water Levels 



39. The analysis procedure for obtaining wave and water level para- 

 meters from the photopole record is described in detail by Ebersole and Hughes 

 (1987). In summary, the digitized time series were cleaned through visual 

 inspection and then filtered to remove long-period wave motions. The filter 

 eliminated oscillations with periods greater than 30 sec and preserved 

 oscillations with periods less than 16 sec. Various statistical properties of 

 the approximately 12-min long filtered record were then determined, as listed 

 in Table 4. For each experiment run, the landward-most pole is at the top of 

 the group, and the seaward-most pole is at the bottom. The listed wave 

 properties were calculated through both spectral and individual wave (zero-up 

 crossing and zero-down crossing) methods. 



40. The notation used in Table 4 denotes quantities as follows: 



BED -- seabed elevation relative to NGVD (meters) 

 ELEV 



ELEV - - mean water surface elevation measured during the 

 mean run at the photopole, either above (+) or below (-) 

 NGVD (meters) 



29 



