CONTENTS 



Page 



Section I. INTRODUCTION 1 



1. Background 1 



2. Scope and Objectives 3 



Section II. ISOTOPES, TAGGING TECHNIQUES, AND INSTRUMENTS .... 4 



1. Isotopes and Tagging Techniques 4 



2. Injection Devices 5 



3. Detector and Onboard Data Collection System 7 



4. Computer Program 8 



Section III. FIELD TESTS 13 



1. General Program Design 13 



2. Xenon Experiments 13 



3. Results of Xenon Experiments 19 



4. Gold Experiments 24 



5. Results of Gold Experiments 25 



Section IV. COMPARISON OF THE RIST SYSTEM WITH OTHER ARTIFICIAL 



TRACING METHODS 36 



1. General 36 



2. Comparison of RIST to Other Sediment Transport' Studies . 39 



Section V. SUMMARY 42 



LITERATURE CITED 45 



ILLUSTRATIONS 



Table Page 



I SUMMARY OF INJECTIONS 17 



Figure 



1. Study Area. Actual site of tracing operations was on 

 Vandenberg Air Force Base property 2 



2. Cumulative size frequency curves 6 



3. Packet of gold-tagged sand 



4. Tagged sand carrier dispenser installed on stern of LARC XV. 8 



