open access

https://hdl.handle.net/2115/36085

The Kyucho occurred off Kameda Peninsula, Hokkaido, at the end of May, 2006

日本語

wind-induced internal Kelvin wave

2009-02-28

Research Faculty of Fisheries Sciences, Hokkaido University

Bulletin of Fisheries Sciences, Hokkaido University

58(3)

29-41

A large damage to fishing set-nets caused by the Kyucho occurred off Kameda peninsula on 30 May, 2006. Such Kyucho seldom occurs in this area and hence it is unusual phenomenon. Two current-meters setting off Usujiri located at Kameda peninsula and off Shiraoi faced the Hidaka Bay captured this sudden and swift current. The meteorological and oceanographical conditions in 2005 without the Kyucho and those in 2006 with the Kyucho were compared. The difference in both years was the oceanic stratification. That is, the surface halocline was thinly formed by a large quantity of rainfall water accompanied by the atmospheric disturbance on 28 May in 2006, before the Kyucho occurrence. In the case of such discontinuity subsurface thinner layer than usual, we will expect that the particle velocity of wind-induced internal Kelvin wave increases, but its phase propagation speed rather decreases. In fact, the observed surface current velocity (0.3-1.2 m/s) is almost as same as the estimated propagation speed (0.3-0.8 m/s).

紀要論文

Version of Record

1346-1842