抄録
On July 28th 1955, while 200 schoolboys and 188 schoolgirls were training in swimming at Nakagawara beach, Tu city, about 76 girls were drowned, and 36 girls of them died.
At that place, it is expected that if the seaconditions were normal, the speed of the tidal current would be only 5.0cm/sec or less. On the other hand, the speed of the current which caused the tragic case was estimated at about 15-30cm/sec or more.
This abnormal current can be explained as the longshore current, having the speed of 23-32 cm/sec, produced by the swell coming from the Typhoon No. 13.
