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Oceanographic - Drogue
Tracking
The use of free floating drogues is a simple yet powerful method of investigating a regional flow regime. Typically a number of drogues are released and followed for a full tidal cycle (12.5 or 25 hours). This provides information on the Lagrangian residual in an area as well as the typical flood and ebb excursions.
Drogues can also be used to produce a Tidal Atlas showing the spatial distribution of the currents in a survey area at different stages of the tide. A number of shorter tracks would generally be carried out in this latter case.
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