Lagrangian drifter
Encyclopedia
Lagrangian drifters are drifter
Drifter (floating device)
Drifters are floating devices to investigate ocean currents. The major components of drifters are hollow bodies that ensure flotation, "sails" to catch water currents, instruments , and waterproof containers for instruments...

s designed to aid the Lagrangian analysis
Lagrangian analysis
Lagrangian analysis is the use of Lagrangian coordinates to analyze various problems in continuum mechanics.Lagrangian analysis may be used to analyze currents and flows of various materials by analyzing data collected from gauges/sensors embedded in the material which freely move with the motion...

 of water current
Current (stream)
A current, in a river or stream, is the flow of water influenced by gravity as the water moves downhill to reduce its potential energy. The current varies spatially as well as temporally within the stream, dependent upon the flow volume of water, stream gradient, and channel geometrics...

s (ocean current
Ocean current
An ocean current is a continuous, directed movement of ocean water generated by the forces acting upon this mean flow, such as breaking waves, wind, Coriolis effect, cabbeling, temperature and salinity differences and tides caused by the gravitational pull of the Moon and the Sun...

s, river flows, etc.)

Numerous types of drifters are designed with constructions particularly suited for particular areas of application: coastal currents, deep water/shallow water currents, etc.
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