black to contrast with the white foam on the water surface when reading the 

 films. These poles, called "photopoles , " each had two short rods placed 

 horizontally near their top ends and were separated by a known distance 

 (typically, 1 m) to calibrate the wave height measurement. Figure 4 shows the 

 photopole line during SUPERDUCK. Pairs of photopoles were filmed with six 

 synchronized 16-mm professional-grade movie cameras mounted on a 4.5-m-high 

 scaffold located on the beach about 125 m south of the photopole line. The 

 cameras were run in the pulse mode at 5 Hz for a nominal duration of 12.5 min 

 which included a sand trap run. Ebersole and Hughes (in preparation) describe 

 the SUPERDUCK photopole experiments and results. 



16. The bottom profile along the photopole line was surveyed each day 

 by means of an infrared beam total survey station housed at the main building 

 of the FRF. These surveys were supplemented by standard transit surveys per- 

 formed from the base camp and by wide -area surveys taken by the CERC Coastal 

 Research Amphibious Buggy (CRAB) . Ebersole and Hughes (in preparation) and 

 FRF (1986) present wide-area bathymetry data. Initially, the nearshore 

 bathymetry in the vicinity of the base camp consisted of an alongshore trough 



Figure 4. Photopole line spanning the surf zone 



15 



