2020 Volume 84 Issue 4 Pages 261-270
To clarify the relationship between multi-layer current conditions and damage to set net fisheries caused by Kyucho events, the current velocities at two layers (10 and 30 m depth) were measured in 2015 and 2016 at four stations off the coast of the Tango Peninsula. Our results showed that the mean current speed at 10 m was faster than that at 30 m at all of the stations. In addition, the Kyucho events occurred on more days at 10 m than at 30 m. However, three out of seven cases of the Kyucho damage were caused by strong flows at 30 m only, while the damage induced by a strong flow at 10 m was only one case. In addition, the maximum current speed at 30 m was faster than that at 10 m in five cases. This indicates the importance of the current monitoring not only at 10 m but also at 30 m to understand and reduce the Kyucho damages. The difference of characteristics of the multi-layer current conditions was recognized among the fishery grounds. The improvement of accuracy of the Kyucho warnings can be expected by monitoring the multi-layer current predictions based on this difference.
