Figure 21 . Side view of steel frame and polyester mesh sediment trap used 

 at Duck, NC, by Kraus (1987) during CERC's DUCK-85 field 

 experiments 49 



Figure 22. Plan view of basic ripple types (modified from Allen 1968) . . 52 



Figure 23. Two- and three-dimensional bed forms 53 



Figure 24. Velocity-grain size relationships for subaqueous bed forms . . 54 



Figure 25. Principles of obtaining subbottom seismic data 60 



Figure 26. Side-scan sonar in operation 61 



Figure 27. Sample form for core description of sedimentary environments 71 



Figure 28. Photograph of a portion of the Los Angeles/Long Beach 



Harbor physical model 78 



Figure 29. Comparison of wave gage pressure measurements recorded at 



Long Beach sta 1 and 2 79 



Figure 30. Example of continuous wave pressure record and wave burst 



sampling of pressure data 82 



Figure 31. Pressure data collected by two gages mounted on a tripod off 



Mobile Bay, Alabama 84 



Figure 32. Example of a single wave burst of 1,024 pressure 



points from the same gages that produced the records 



in Figure 31 84 



Figure 33. Analyzed wave data from Burns Harbor, Indiana 85 



Figure 34. Pressure data from Burns Harbor, Indiana, 



April 6, 1988 86 



Figure 35. Example of tabular summary of wave data from offshore Fort 



Walton Beach, Florida 90 



Figure 36. Plots of wave height, peak period, and peak direction from 



offshore Fort Walton Beach, Florida 91 



Figure 37. Coastal currents measured off Fort Walton Beach, Florida 



Panhandle 97 



Figure 38. Current measurement stations in East Pass Inlet, Destin, 



Florida, during October, 1983 99 



