for specific structures. Since the field of oceanography is rapidly expanding, 

 listings such as those prepared for this report soon become outdated. However, 

 these listings are still useful for most structures currently being proposed for 

 emplacement at various ocean floor sites. 



Tables B-1 to B-9 of Appendix B list the various instruments that are 

 available to assess the parameters required in site surveys. These tables are 

 organized in the following categories: 



positioning systems 

 core samplers 

 subbottom profilers 

 grab and dredge samplers 

 geological oceanographic systems 

 physical oceanographic systems 

 biological oceanographic samplers 

 underwater cameras and lights 



These listings include the instruments on which information could be obtained 

 from various manufacturers, distributors, and advertisements in periodicals. 

 Several instrument systems do not fall into such convenient groups. 

 These instruments are used to assess the foundation supporting characteristics. 

 Since this is the most important area of site selection and survey, comprising 

 approximately 80% of the effort, 29 these instruments will be discussed first 

 followed by the other items in the tables. The in-situ vane shear, cone pene- 

 trometer, plate bearing, long-term settlement devices, the Deep Ocean Test 

 Instrument Placement and Observation System (DOTIPOS), and in-situ sedi- 

 ment density— water content probe will be discussed. 



DOTIPOS System 



The Deep Ocean Test Instrument Placement and Observation System 

 (DOTIPOS) shown in Figure 15 has been designed for use in various seafloor 

 project applications. It is approximately 18 feet high, 18 feet square, and 

 weighs approximately 6,000 pounds in air and 2,500 pounds in seawater. 

 Appurtenant parts to this device include a traction winch, diesel power unit, 

 coaxial cable stowage drum, and an instrument van. The multiconductor 

 coaxial armored cable, in addition to supporting the load, provides up to 

 15 kw of electrical power for use by various project in-situ test sensors and 

 the TV monitoring system. The DOTIPOS is presently equipped for in-situ 

 vane shear and cone penetrometer tests. Provisions have also been made for 

 installing the long-term settlement devices with this system. 



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