75. 



be a manned submersible. This technique allows accurate 

 location of samples with relation to each other, such as 

 are needed to determine the interaction of biotic components 

 with their physical environment. 



The experience gained during the present study helps 

 to identify some of the technical considerations that should 

 be taken into account in future studies. Near bottom side- 

 scan sonar would allow for detailed mapping of substrate 

 bedforms and layering characteristics, such that outcrops, 

 scars, slump deposits and zones of winnowing could be 

 discriminated. The sub-bottom profiling should be high 

 resolution using soiond sources of 2 to 5 kHz. The navigational 

 capabilities need to be as accurate as those used in the 

 present field study. The towed camera-sled should be modified 

 to allow for operation in a flying mode in areas of complex 

 topography and high relief. Modifications should also include 

 camera positions at higher angles of vertical incidence with 

 respect to the bottom. This allows for a more accurate 

 determination of aerial coverage. Such vertical incidence 

 photography from a flying vehicle must be accompanied by an 

 altimeter (resolution > 0. 5 m.) and inclinometer (resolution 

 of 5°) . To obtain more continuous coverage it is recommended 

 that the camera-sled be towed along bathymetric contours 

 rather than across them. 



Current measurements are important and need to be made 



