トリチウム濃度でみた池田湖の鉛直混合の検討

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タイトル別名
  • ON THE VERTICAL MIXING OF LAKE WATER VIEWED FROM THE TRITIUM CONCENTRATION IN LAKE IKEDA
  • トリチウム濃度でみた池田湖の鉛直混合の検討(短報)
  • トリチウム ノウド デ ミタ イケダコ ノ エンチョク コンゴウ ノ ケントウ

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A vertical mixing process in a fresh water lake is investigated from the secular variation of tritium concentration in Lake Ikeda. The lake is covering an area of 10.96km2 at an altitude of 66 m whose catchment area is 11. 29km2 and maximum depth is 233m (Fig. 1).<br> A reconnaissance survey was carried out three times, on Oct. 21, 1973, Nov. 5, 1974 and Nov. 30, 1979. Water samples for tritium analysis were collected at every 20m vertically in the center of the lake. Temperature, pH, RpH and electrical conductivity of the water were determined on the spot. On Nov. 25_??_30, 1979 and Nov. 2_??_8, 1980, stream flow measurements and groundwater survey were carried out.<br> The annual water balance of the lake was calculated for the period from 1977 to 1980 (Fig. 2). The mean precipitation to the lake was 2, 295.0mm •yr-1, that is 0.80m3 •sec-1, and the mean evaporation was 1, 018.7mm•yr-1, 0.35m3•sec-l. The evapotranspiration from the catchment area was 712.4mm•yr-1, 0.26m3•sec-1 and the artificial intake was 0.21m3sec-1. The discharge from the lake depends upon groundwater outflow which is about 59% of the total outflow and the seepage is found at Kyoden Spring and the drainage area of Minato River.<br> Secular variation of tritium concentration in lake water is shown in Fig. 7. In 1973 and 1974, the hypolimnion water was in high concentration, but in 1979 the water in uniform. From these facts it seems that the lake water does not mix in every winter but does only in a cold winter which occurs once in several years.

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