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"Naturalists using the dredge", a plate from William Henry Harvey's The Seaside Book. The first marine biology dredge was designed by Otto Friedrich Müller and in 1830 the results of two dredging expeditions undertaken by Henri Milne-Edwards and his friend Jean Victoire Audouin during 1826 and 1828 in the neighbourhood of Granville were published.
In terms of disadvantages, the stockless anchor is shown to perform poorly in soft cohesive bottoms such as soil or sand compared to other anchor types made specifically for that type of bottom. [6] Also, the Navy Stockless Anchor has an efficiency rate of 4–6, compared to other types of anchors with efficiency rates ranging from 15 to 55. [7]
Bottom trawling is trawling (towing a trawl, which is a fishing net) along the seafloor. It is also referred to as "dragging". The scientific community divides bottom trawling into benthic trawling and demersal trawling. Benthic trawling is towing a net at the very bottom of the ocean and demersal trawling is towing a net just above the benthic ...
Fifteen storey tall continuous slip formed support legs under the Troll A Oil Platform in 1000 ft (303 m). [1]In large scale oceanic civil engineering, vacuum-anchors are used to anchor gravity-based structures [1] (such as the Troll A Oil Platform) in the soft bottomed muck found on many oil bearing continental shelves and the world's shallower seas.
on her own bottom. Plural on their own bottoms. Said of a vessel making a voyage without being carried aboard another vessel; e.g. "the yacht crossed the ocean on her own bottom", or in the plural, "yachts rarely cross the ocean on their own bottoms". on station A ship's destination, typically an area to be patrolled or guarded. on the beach 1.
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