Annual Journal of Civil Engineering in the Ocean Vol.38
THE EXPERIMENTS OF PUMICE STONE DRIFTING OF THE MOVING PROCESS IN THE WIND TUNNEL
2022 Volume 78 Issue 2 Pages I_865-I_870
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2022 Volume 78 Issue 2 Pages I_865-I_870
A group of pumice from a significant eruption in August 2021 on the Ogasawara Islands, Tokyo, drifted to the coastal areas of the Okinawa/Amami region about 1,400 km away, causing extensive damage to the tourism and fishing industries. Although there have been studies on the drifting of spilled heavy oil and containers, there have been few studies on the accumulation process in port facilities after a large amount of pumice stone drifted into the coastal area. For this reason, the laboratory continues to study the migration characteristics of pumice in a coexisting wind and wave field using a wind tunnel channel.
In this study, we examined the effects of wind and waves on the migration characteristics of pumice stone groups within a constriction to elucidate the phenomenon of pumice stone burial in port facilities. As a result, the processes of deposition and flow of the pumice stone group depend on the constriction width. Furthermore, the flow through the constriction is changed. In addition, The speed of pumice stone movement can be deduced from the vertical component of the wind.
