Figure 1 3-4. Interior view of the beach end of the WRL building 



generator end of the channel. The latter facilitated rapid water inflow without 

 beach erosion. The filling port is shown in Figure 13-5. A sump for the 

 drain pump is located 2 ft (0.6 m) in front of the wave board at the channel 

 center line. Filling and emptying proceed at a rate of approximately 1 ft/hr 

 (0.3 m/hr). 



Interior lighting is provided by 56 metal halide lamps, 400 W each, sus- 

 pended from the ceiling at 25-ft (7.6-m) centers longitudinally and 20-ft (6.1- 

 m) centers laterally. Passive lighting is provided by a continuous band of 

 4-ft- (1.2-m-) high windows (3.5 ft (1.1 m) above the floor) around the perim- 

 eter of the building, 8-ft- (2.4-m-) deep translucent panels below the eaves and 

 at the peaks of the end walls, and 1,700 ft 2 (160 m 2 ) of 75-percent reflective 

 glass on the west wall of the building. Passive lighting was sufficient for 

 most video and still photography applications during daylight testing periods. 



Wave generator. The wave generator is a servo-controlled, hydraulically 

 driven hinged-fiap wave board. The wave board is a 5,000-lb (2,270-kg) 

 aluminum weldment that is hinged at the base of the channel in an overall 



Chapter 13 Wave Generation and Data Collection Systems 



261 



