琵琶湖南湖の熱収支 -琵琶湖大橋断面での湖水交換-

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  • HEAT BUDGET IN SOUTH BASIN OF LAKE BIWA-THE WATER EXCHANGE BETWEEN THE SOUTH AND THE NORTH BASIN OF LAKE BIWA AT BIWA-KO BRIDGE-
  • ビワコ ナンコ ノ ネツ シュウシ ビワコ オオハシ ダンメン デ ノ コスイ

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In order to elucidate the heat transfer and the structure of the water exchange between thesouth and the north basin of Lake Biwa, we calculated the seasonal variation of water and heatbudget in the south basin and the heat flux through Biwa-ko bridge divided to 7 frequency bands.The detailed observation of water temperature and flow near the bridge was conducted to catchthe density current of winter season.The calculated results of the heat budget show that the convective heat transfer between thetwo basins plays not less important role than that of surface heat process for the seasonal varia-tion of the water temperature in the south basin.From the frequency analysis of the heat transfer, it is found that the contribution of the densitycurrent is about ten times greater than that of alternative current and the dispersion coefficientsdue to the first mode of the seiche and density current are estimated 2.1x10 4 cm2/sec and 3.0xlO 5 cm2/sec, respectively.The distribution of water temperature observed shows the clear intrusion of cold water bythe density current from the south to the north basin of Lake Biwa.

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