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Study on Dynamics of Kyucho

急鸟动力学研究

基本信息

批准号：
10640420
负责人：
MATSUYAMA Masaji
金额：
$ 1.79万
依托单位：
Tokyo University of Fisheries
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640420/
关键词：
Kyucho Costally trapped wave Dinsity current Kuroshio Typhoon Internal Kelvin wave Continental shelf wave Semidiurnal internal tides 黒潮流路変動カップリング黒潮系水

项目摘要

Kyucho, coastal stormy current, often has destroyed the fishing set-net in Sagami Bay, located at the southeastern coast of the central Japan. We have tried to clarify dynamics of the coastal stormy current.On January 9, 1994, a Kyucho rushed along the Sagami Bay coast having the maximum velocity was 0.65msィイD1-1ィエD1 with a steep temperature rise, and the strong current continued for about half a day. NOAA-IR image showed the warm water intrusion of the Kuroshio water through the Oshima west channel and moving cyclonically along the coast. The behavior of the Kyucho is similar to that of the coastal density current in a rotating fluid. The Kyucho was suggested to occur during the transition period from the non-meander nearshore path of the Kuroshio to the non-large meander offshore path.Kyucho, on September 18, 1988, caused fishing set-net to drift 8km along the coast in the southward current. The temperature rise at 30m depth moves with speed of 0.6msィイD1-1ィエD1 cyclonically. which it almost agrees with the maximum current at the moored stations. The temperature variations at 60m depth are very similar to the sea-level variations on the Sagami Bay coast. The sea-level variations propagated at 2.1-2.5msィイD1-1ィエD1, trapped at the coast cyclonically. These phenomena are similar to the characteristics of coastally trapped waves, and appear to be generated by the warm water that is piled up the coast by Ekman transport of the strong southward wind stress associated with Typhoon 8818.

位于日本中部东南海岸的相模湾，经常有一股叫Kyucho的沿海风暴流破坏捕鱼定置网。1994年1月9日，一条最大流速为0.65ms/m2 D1-1/m2 D1的Kyucho急流沿着相模湾沿岸，温度急剧上升，强海流持续了约半天。NOAA-IR图像显示，黑潮暖流通过大岛西水道侵入，并沿海岸沿着气旋式移动。Kyucho的行为类似于旋转流体中的沿海密度流。1988年9月18日，在黑潮非弯曲近岸路径向非大弯曲近岸路径过渡的过程中，出现了一次9月18日的9 30 m深度的温升以0.6ms的速度D_1 -1的速度D_1呈气旋式移动。其几乎与系泊站处的最大电流一致。60 m深度的温度变化与相模湾沿岸的海平面变化非常相似。海平面变化在2.1-2.5ms的周期内传播，并以气旋方式被困在海岸。这些现象类似于海岸被困波的特征，并且似乎是由与8818号台风相关的强烈向南风应力的Ekman输送堆积在海岸上的暖水产生的。