Bottom Tripod System
The bottom photographs shown in this Apple Quicktime time-series movie (~30Mb) were obtained by means of a 35 mm Benthos camera mounted
approximately 2 m above bottom on a tripod frame (photo). The
pictures were obtained nominally every four hours(3 hours 59 mins in this deployment).
The field of view is approximately 1 m by 1.5 m.
True north is to the top of the screen. A compass and vane mounted on a swivel, showing
the orientation of the tripod and instantaneous direction of flow, are partially visible
in the photos (the vane is often out of the field of view, and the glare of the strobe on
the glass dome housing the compass limits the time that the magnetic north arrow is
visible).
In addition to bottom photographs, instruments on the tripod measured current,
temperature, light transmission, pressure, and conductivity. These provide direct
measurements of the processes causing sediment resuspension and transport. The tripod also
supports a sediment trap that collects sediments suspended in the water column.
