Abstract
A flowmeter is described which has been designed and constructed for the purpose of determining planar orbital velocities of particles in an underwater wave field. The instrument responds primarily to hydrodynamic drag force and is relatively insensitive to fluid-acceleration forces. Orbital speeds of from 1 to at least 40 in./sec can be measured, and flowmeter response is independent of orbital frequency up to several cps. Flutter tendencies and spurious effects, perhaps attributable to vortex shedding, have been suppressed. Typical results are cited of experimental observations using the orbital velocimeter under wave action within an oceanographic tank.
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