Takafumi SHIMAKURA
The GPS drifter tied by nylon wire for offshore current measurement
Hiroki IRIE
””This paper describes smaller GPS drifters (GPS floats, GPS buoys)””for the determining flow patterns in ultra shallow water in the vicinity of the coast. It is difficult to make the current visible in ultra shallow water near the coast. It is because the wave influences the measurement instrument. There are two kinds of general fluid measurement methods (Euler's method and the Lagrange method). The method of the measurement with the fixed observational equipment is called Euler's method. The method of pursuing the tracer as the ARGOS floats is called a Lagrange”Ēs method. Our projects are researching and developing the GPS drifter. These GPS drifters are used in the closed sea or shallow sea. In this paper, it reports on the smaller GPS drifter of the cable type that doesn't have the radio communications equipment, and installs a micro GPS logger. They tie cable type GPS small float with a thin, flexible wire made of nylon. The offshore current was measured by using the GPS drifter, and the effectiveness of the GPS drifter was shown actually.
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