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HAPS
The
HAPS frame supported corer is
highly suitable for taking well defined, virtually undisturbed
seafloor samples of soft and hard sediments. The corer may
be adapted to all types of sediments while providing accurate
sampling. It has high stability and it is easy to maintain
and to operate.
Using
its large supportive base, the HAPS
finds itself a stable sampling position even in the most adverse
conditions - such as operating in swell seas or on a sloping
seabed. The HAPS may be
customized for various sampling conditions simply by adding or
removing lead weights at specific points along the frame.
For hard sediments sampling, extra lead weights are required to be
mounted at the top of the steering bar (up to 9 weights of 4.40
pounds each). To increase the HAPS stability, pairs of 22
pounds lead weights can be mounted on the lower section of the
frame. For overall weight increases (up to 1`4 lead weights
of 11.0 pounds each) may be added at the middle of the frame on
top of the tube holder.
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MULTI
CORER
Design:
The multiple sediment corers are hydraulically damped enabling
the sample tubes to be lowered with minimal disturbance of the surface sediment. The sampling tubes enter the sediment at
approximately 5 cm per second. No acoustic or electronic controls are required for operation, leading to minimal operator
handling and simple winch deployment. Each core tube is held in a separate detachable holder, enabling the sealed samples to be
removed from the corer. The head of the larger corers is made on a modular basis so that the number of holders is carried by the
Midi and Maxi can be increased at a later date. |
Operation:
Corer deployment rates are in the region of 1 metre per second on the descent, and at any speed on retrieval
as the samples are positively sealed. On retrieval, the top cap seals the tube before withdrawal, and the
base catcher operates immediately the sediment is cleared. This procedure includes some supernatant
water in the core preserving sediment/water interface, and producing
samples of a high quality
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