IV 
VI 
CONTENTS 
CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) 
SYMBOLS AND DEFINITIONS . 
INTRODUCTION. 
PRIMARY GOAL OF SPECTRAL ANALYSIS . 
PRACTICAL LIMITATIONS OF SPECTRAL ANALYSIS. 
1. Calculation Procedures . 
2. Display Formats. 
3. Natural Variability. 
INTERPRETATION OF SPECTRA . 
1. Highest Spectral Peak. one 
2. Major Secondary Spectral Peaks . 
3. Example Problem. 
INTERPRETATION OF SPECTRA FOR APPLICATIONS SENSITIVE 
TO SPECIFIC FREQUENCIES. 
SUMMARY . 
LITERATURE CITED. 
TABLE 
Spectrum for Huntington Beach, California 
FIGURES 
Spectrum for Wrightsville Beach, North Carolina . 
Energy spectra for wave record at 0400 e.s.t., 17 March 1968. 
Energy spectra for record composed of three superimposed 
sinusoidal waves . 
Five formats frequently used in displaying wave energy spectra. 
Wave energy spectra from bottom-mounted pressure gages at Channel 
Islands Harbor, California . A 
Wave energy spectra from pier-mounted continuous wire gages 
at the CERC Field Research Facility. 
Directional spectrum obtained in the Atlantic Ocean 68 miles 
east of Jacksonville, Florida. 
Spectrum for Huntington Beach, California . 
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