FIGURE 2.5 Sand cloud generated by a trawl door as it is towed over a flat sand seabed (Main and Sangster, 1981).

FIGURE 2.6 Trawl door on hard seabed showing the absence of a sand cloud pattern. Coarser grained sediments are briefly suspended but rapidly settle (Main and Sangster, 1981).

FIGURE 2.7 Scale drawing of representative sizes of trawl gear. This drawing illustrates the relationship between the sweep of the bottom trawl gear and the vessel size.

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