Re-Transport Mechanisms Of Fallen Pollen By Surface-Creep And Saltation
The cedar pollinosis is a very serious problem in Japan. The prevalence of this pollinosis is considered more than
20% among the Japanese. In the point of avoiding pollen exposure, it is important to clarify the pollen transport mechanisms.
In particular, in urban areas of Japan, the house has been built to be nearly in contact with another. If the fallen pollen on the
roof is re-transported and falls down to the lower level, the exposure amount will increase drastically. Accordingly, in this
study, we focus on the re-transport mechanisms of the fallen pollen on surfaces and carried out the wind tunnel experiments by
using test particles to clarify the pollen exposure from roofs. The test particles are carried by the wind, and move (creep) along
or jump (saltate) repeatedly on the surface. Consequently, we discuss the followings in this paper: the optical measurement of
surface-creep and saltation behavior of the test particles, the generality of the flow field in this study and the possible
conditions of re-transport from a surface.
Keywords- Flow Visualization, Multi-phase Flow, Particle Tracking Velocimetry, Pollen Transportation