CONTENTS 



FIGURES— Continued 



Page 



21 Radar wave image from Cape Cod, Massachusetts, taken 



8 January 1976 22 



22 Radar film analysis device 24 



23 Radar image from Channel Islands Harbor, California, showing 



measurement of wave direction and length 24 



24 Schematic showing Bragg scattering 27 



25 Radar image taken with the CERC radar at Channel Islands 



Harbor, California 29 



26 Radar wave image taken at Channel Islands Harbor 2 hours 



after the photo in Figure 25 29 



27 Composite of a° data for a "medium" sea 30 



28 Schematic showing how for low radar antenna elevations larger 



waves, at times, shadow the following wave crests and limit 

 effective range of instrument for imagery 31 



29 Schematic showing how high radar antenna elevations give a 



radar return from troughs of waves, decreasing the contrast 



in the imagery 31 



30 Schematic showing the restriction on line-of-sight by 



curvature of the Earth 33 



31 Schematic showing the illumination of wave crests by radar 



at 4.6 meters elevation 34 



32 Aerial photo taken by NASA U-2 aircraft over Mission Beach, 



San Diego, California, 14 March 1977 36 



33 SAR image of Mission Beach at San Diego, California, 28 



March 1977 39 



34 Two-dimensional Fourier transform of SAR image shown in 



Figure 33 40 



35 CERC radar image at Mission Beach, 28 March 1977 41 



36 Scatter plot of radar measurements versus pressure gage 



measurements of wavelength 42 



37 Scatter plot of radar measurements versus pressure gage 



measurements of period 44 



7 



