CONTENTS 



Page 



Section I. INTRODUCTION I 



Section II. ELECTRONIC COMPONENTS 2 



1. Channels and Gating Circuitry 6 



2. Power Supply 5 



3. Data Storage 7 



Section III. SPECIAL SENSORS 9 



1. Digital Wave Staff and Mini-Digit Staff 9 



2. Vi brat! ng-Wi re Pressure Sensor 15 



3. Savon i us Current Meter 18 



4. Synchronous Timing Lights 18 



Section IV. PROGRAMMING TIME SERIES 20 



1 . One-Dimensional Power Spectra 21 



2. Two-Dimensiona 1 Power Spectra . . 25 



3. Adaption to BOMM Program 27 



Section V. EXAMPLES OF FIELD AND LABORATORY INSTRUMENTATION ... 30 



1. Array of Digital Wave Staffs for Longshore Component of 



Wave Power 30 



2. Mechanics of Sand Transport by Waves and Currents .... 33 



LITERATURE CITED 35 



Appendix A. RECENT TRENDS IN COMPUTER PROGRAMMING FOR SPECTRAL 



ANALYSIS 37 



ILLUSTRATIONS 



Figure Page 



1. Photograph of the Data Acquisition System Recording Waves 

 Measured by the Mini-Digital Staff 3 



2. Schematic Diagram Showing Field and Laboratory Uses of DAS 4 



3. Block Diagram of the Data Acquisition System 5 



4. Magnetic Tape Format 8 



5. BCD Coding for Channel Identification 8 



