CONTENTS 



INTRODUCTION . . . page 7 



PART I. TOWER ADVANTAGES ... 9 



Accessibility ... 10 



Stability ... 12 



Permanence ... 14 



Economy ... 16 



Laboratory- Like Conditions ... 18 



Versatility ... 20 



PART II. TOWER STUDIES AND INSTRUMENTATION ... 23 



Water Motion Studies ... 25 



Internal Waves ... 26 



Thermal Structure Measurement ... 28 



Thermal Structure Prediction ... 30 



Horizontal Currents ... 32 



Vertical Currents and Turbulence ... 34 



Speed, Height, and Propagation Direction ... 36 



Coherence ... 38 



Sea- Surface Slicks ... 40 



Surface Temperatures ... 42 



Swell and Wind Waves ... 44 



Acoustic Studies ... 47 



Biological Factors ... 48 

 Ambient Sound ... 48 

 Target Identification ... 50 

 Acoustic Scattering ... 52 

 Sound Attenuation (Plankton) ... 54 



