CETN-II-12
3/86
Herion valves which control the flow direction, a pulse valve to control
cassette rotation, two push button controls for firing the ram and indexing
table, and two indicator lights to let the operator know that the functions of
the ram and indexing table have been carried out. The control for the ram is
fitted with a timer which sets the length of time that air enters the ram
controlling the stroke length. Figure 5 is an illustration of the control box
depicting the position of the components. The controls in the box are
connected to their respective pneumatic components on the prototype sampler by
18 m of nylon tubing. The length of tubing is dependent on the distance from
the operator to the sampler. To operate the sampler, bring the air pressure
to 80 psi for the inndexing table and 120 psi for the ram.
Push the control
button for the ram (the indicator light will go black) and the ram will
emplace and extract a sample tube. When the ram is fully withdrawn the
indicator light will show green. Then. the control button for the indexing
table is pushed (the indicator light will show black) causing the indexing
table to rotate forward one position and lock. After this function the
indicator light for the indexing table will show green and the sampler is
ready for another sequence. The time required to take an average 0.5 m core is
approximately 20 seconds.
SUMMARY: At present the ROSCO system is mounted on a sea sled and can be
towed behind Coastal Engineering Research Center's CRAB or a large boat. With
the ROSCO, short cores of bottom sediments in nearshore environments, inland
bays, and lakes can be obtained. The ROSCO gives the coastal engineer the
advantage of collecting data continuously over an extended period during foul
weather conditions when sediment transport is usually at its maximum. This
capability will provide a more complete record of the temporal and spatial
variability of nearshore sediment characteristics.
ADDITIONAL INFORMATION:
Contact Dr. Donald K. Stauble at (601) 634-2056,
Coastal Morphology Unit, CERC, (601) 634-2056.
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