STUDY ON THE WATER CIRCULATION IN LAKE BIWA-SEPARATION OF THE STEADY CURRENT AND INTERNAL WAVES-

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  • びわ湖湖流の研究 -湖流と内部波の分離-
  • ビワココリュウ ノ ケンキュウ コリュウ ト ナイブハ ノ ブンリ

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Abstract

Temperature data from bathythermograph surveys across the main circular current in LakeBiwa performed from 1973 to 1978 are analyzed. The anticlockwise circular current existsalways in summer and the difference of the geopotential anomaly ⊿D at the water surface be-tween its center and its circumference is about 0.7 dyn.cm on the average. Its standard devia-tion of the horizontal distribution is about 0.3 dyn.cm. Internal waves also exist almost always, whose standard deviations of horizontal distributions of the surface ⊿D are about 70% of thatof the circular current on the average. The mean total transport of the circular current is estimatedto be 1.7x10 3 m3/sec to the north, which implies a large scale vertical circulation.

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