TABLE 11.3 RESEARCH DIVES AND INSTRUMENTATION (Cont.) 



Purpose 



Instrument(s) 



1966 2820 San Diego 



1966 3978 



1966 



960 



Lausen Sea 

 Mount 



San Diego 

 Trough 



1966 4080 San Diego 



1967 



3300 Cozumel Is. 

 Mexico 



Acoustics 



Physico-Chemical 



Bio-acoustics 



Radiation 

 Measurements 



Currents 



Provide bottom sediment in- 

 formation for development 

 of a geotechnical test area 



Bottom reconnaissance and 

 gravity measurements 



Attain information to derive 

 accurate sound speed equa- 

 tions and anomalies 



Obtain in situ bottom data 

 and samples to calculate 

 accurate values of acoustic 

 bottom loss 



Measure: Physical-chemical 

 properties of seawater af- 

 fecting sound; water motion 

 near sea floor; sediment 

 thermal structure. 



Measure in situ target strength 

 of Marine organisms 



OSL investigations 



Determine in situ sound veloc- 

 ity and attenuation in upper 

 sediment layers. 



Attain an ambient background 

 gamma radiation profile of 

 the water column for future 

 comparison 



Observe and photograph cur- 

 rent shear velocities through 

 the use of dyes 



Ref 



Static cone penetrometer (4-ft 24 

 penetration) and vane shear 

 device (11.2-ft penetration) 



Model "S"LaCoste- Romberg 13 

 gravimeter 



Fjarlie bottles (4 ea.) with re- 26 

 versing thermometers, Vibra- 

 trons (2 ea.) pressure depth 

 gages, sound velocimeters 

 13 ea.), temperature probes 

 (2 ea.) and one salinometer 



On an aluminum tube hanging 13 

 from brow: 4 geophones to 

 receive output from 6 elec- 

 tric blasting caps. Geophone 

 output recorded on internal 

 tape. 



Fjarlie bottles, temperature 13 

 sensors, bottom temperature 

 probe, savonius current me- 

 ter 



A 14-kHz transducer (5-degree 13 

 cone width) was positioned 

 to transmit and receive 

 sound pulses; a 1-ln. steel ball 

 was placed In position to 

 serve as a target reference 

 strength 



"Fish Slurper" Biological 13 

 sampling device 



Three probes on a rigid frame, 25 

 eacn holding a barium titan- 

 ate transducer, were inserted 

 into the sediment to a depth 

 of 2 ft. 



A sodium iodide crystal pho- 13 

 tomultiplier mounted exter- 

 nally and a rate meter 

 (counter) carried internally 



A metal bucket (also serving as 27 

 the anchor) containing a 

 gasoline-filled clorox bottle 

 and two dye cakes attached 

 to a line between bucket and 

 bottle was deployed by the 

 manipulator 



559 



