CONTENTS 



Page 

 INTRODUCTION 1 



o 



Background z 



Approach and Scope 3 



DESCRIPTION OF EQUIPMENT 3 



THEORY OF OPERATION 5 



DATA ACQUIRED 6 



PENETROMETER DESIGN. 



7 



Vehicle Development ' 



Instrumentation Development 10 



TEST PROGRAM AND PROCEDURES 13 



TEST RESULTS 13 



DISCUSSION 16 



CONCLUSIONS 18 



FUTURE PLANS 18 



ACKNOWLEDGMENTS 19 



REFERENCES 19 



LIST OF ILLUSTRATIONS 



Figure 1 . View of Expendable Doppler Penetrometer 4 



Figure 2. Comparison of measured and predicted penetrations 



at Mare Island for all Shapes and Configurations 9 



Figure 3. Penetration depth in a pelagic clay versus 



penetrometer diameter for penetrometers of 



equal weight and penetrometers of equal length 9 



Figure 4. Typical poor trace of velocity versus time from 



first test performed in 100 feet of water in 



November 1974 15 



Figure 5. Typical good trace of velocity versus time from 



test performed in 70 feet of water in April 1975 .... 15 



