Concept
Unspecified Standard ponar grab
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL1215/1/ | ||
|---|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | ||
| Alternative Labels | Standard ponar grab | ||
| Definition | Developed in the mid-1960s (Powers and Robertson 1967), ponar grabs are used to sample coarse or fine, undisturbed sediment from the sea floor. It consists of a pair of weighted, tapered jaws held open by a catch bar across the top of the sampler. On touching the bottom, the tension bar is released, allowing the jaws to move and close. The device is activated by the release of the cable tension on the lifting mechanism when the sampler reaches the sediment. During retrieval, the tension on the cable keeps the jaws closed. It has a pair of metal side plates which prevents the sampler from falling over after the jaws' closure. Its jaws overlap to minimise sample washout during ascent. It is typically used with a winch or crane hoist. The sampled area is approx. 23 cm sq. (approx. 7250 cubic metres). | ||
| Date | 2018-02-27T12:21:14 | ||
| Identifier | SDN:L22::TOOL1215 | ||
| Note | accepted | ||
| Is Version Of | TOOL1215 | ||
| version | 1 | ||
| Broader | L05:50 |
sediment grabs | |
L19:SDNKG17 |
sensor_model | ||
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