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four differential pressure channels failed and/or were distrurbed by 

 the wave tank, the analysis of measurements from the absolute and one 

 differential pressure channel suggest satisfactory performance of the 

 DPG. 



2. Installation 



The cradle was secured to a small flatbed trailer and the 

 instrument mounted upon it. The trailer was easily pulled and 

 delivered to the CERC wave tank by a light vehicle. The outdoor wave 

 tank is a long, 15 foot wide, 20 foot deep facility with a large 

 piston-type wavemaker. The cradle was lowered on its side over the 



BEACH 



POND DPG 



RETURN FLOW PIPES 



WAVE PROBE 



PISTON 



BREAKWATER 



FIGURE V-6: Orientation of the DPG during CERC wave tank tests. 

 Configuration I: 0=55°; Configuration II: 0=35°. 



tank wall by ropes and dropped slowly into the water. It was 

 positioned by two divers under 10.2 feet of water at approximately 



