

|< 100 m 





-1 



Hydraulic 

 power 

 supply 



H Wave (afes Wave gages 



■1 '' ' 6-Ft Flume 



^^^^M 





•^ Test Section ^, 



^^^^m 



Hydraulic 

 power 

 supply 



1 1-Ft Flume 









i 



Wave Tanks 

 Control Room 



Note: This drawing 

 not to scale 



Figure 2. Plan view of 6-ft flume and supporting facilities 



piston motion and wave gages is actively monitored using a multichannel oscilloscope. 



74. Water surface elevations were sensed using both resistance- and capacitance-type wave rods, which 

 were constructed at WES. The wave data were recorded on the Micro- Vax I. An Automated Data 

 Acquisition and Control System, designed and developed at WES (Turner and Durham 1984), was used to 

 calibrate the wave rods and to ensure correct wave height. Figure 5 is a schematic of the data acquisition 

 system used in the 6-ft-wide flume. Six wave rods were used in two groups of three (see Figure 3) to allow 

 calculation of reflected wave energy in the deeper water near the wave board and in shallower water near 

 the movable-bed portion of the tank. The wave rods were calibrated at the beginning of each test series to 

 a tolerance of ±0.002 ft in the model. 



75. To generate regular waves, a wave period and amplitude were specified and a data file consisting of 

 sinusoidally varying stroke as a function of time was generated and used as the input signal to drive the 

 wave machine. For irregular wave generation, software developed at CERC^ was used to generate a piston 



^ Long, C. E., 1985, "Laboratory Wave Generation and An£ilysis: An Instructional Report for Unidirectional Wave Generation 

 and Analysis," unpublished report, CERC, WES. 



27 



