182 



Summary 



Review of experiments and results 



In conclusion, there a few main points to be reiterated that allowed for the 

 success of the OSU deployment during SUPERTANK. The successful config- 

 uration of ARMS, with inclusion of the never-before-deployed BASS 

 velocimeter array, for the laboratory provided a remotely obtained and non- 

 invasive set of measurements. The laboratory configuration allowed for 

 nearly instantaneous monitoring, via the PC array, of data during sampling to 

 maintain optimal gain setting for the ACP and to determine performance 

 characteristics of the BASS array during its first deployment. 



Second, the controlled laboratory conditions of the wave channel allowed 

 for measurement of sediment resuspension and transport in monochromatic 

 third-order waves and their spectral equivalents with broad and narrow 

 spectral peaks of known width. Working in a wave channel also meant the 

 waves were fully unidirectional, and the wave paddle was designed to 

 accommodate and damp out beach, wall, or paddle reflections. Water samples 

 within the concentration profiles could be obtained often and easily in the 

 laboratory during wave runs, which improves the accuracy of the concen- 

 tration profiles. 



A preliminary analysis of vertical sediment fluxes measured during 

 SUPERTANK shows that nonlinear waves produce a persistent sediment 

 transport on the order of 10" 2 mg/cm 2 /sec. This transport is directed offshore 

 because asymmetry in the nonlinear waves shows higher orbital velocity 

 amplitudes in the offshore direction, and the wave periods were 3 and 4.5 sec, 

 which would be classified as erosional waves. Further analysis of the vertical 

 and horizontal transport fluxes can be found in O'Neil (1993). 



Another preliminary analysis was performed to determine whether the 

 profiles of suspended sediment are amenable to the available models. Because 

 the data were obtained in a waves-only climate, and not the wave-current 

 climate observed in nearly all field conditions, there are few models with 

 which to compare. At this time, there are no known models derived from 

 laboratory or field data which predict the sediment concentration with height 

 above the bottom as observed at SUPERTANK. 



Acknowledgements 



The authors would like to thank the U.S. Army Engineer Waterways 

 Experiment Station Coastal Engineering Research Center for its support of the 

 development of ARMS and the SUPERTANK deployment through DRP Con- 

 tract No. DACW-39-88-K-0040; Dr. Nicholas Kraus was the contract moni- 

 tor. The authors would also like to thank Dr. Charles Sollitt and Mr. Terry 



Chapter 9 The Ohio State University Measurements 



