Abstract
As one of the countermeasures against the damages caused by sea-salt particules at the time of a seasonal wind in seaside districts, we measured sea-salt particles produced by seasonal winds and floating in the air, at the coasts of the Tokyo Bay, Sagami Bay and the Japan Sea.
The size distribution of airborne sea-salt particles at shoaly beaches was small in its range, and most of the particles were under 10 la cubic (2.2 × 10-9 gm). On the other hand, the size distribution range at other beaches ranged around 20 u cubic (18.0 × 10-9 gm).
The total amount of airborne sea-salt particles is i n fluenced by the state of the sea surface, and the state of the sea surface is related to the topography of the seaside and wind velocity.
Therefore we classified the total amounts of sea-salt particles according to the featuers of the seaside and Beaufort's wind scale.
The sea-salt particles produced at the surface are mostly lost on the land within 300 meters from the bearch, by sticking to other objects or falling out.
Only about one-fifth of the sea-salt particles are carried far inland. Their size is mostly less than 5 u cubic (2 × 10-10 gm).
The decreasing rate of the sea-salt particles with the trans p ort distance was also studied within 1 km from the beach.
