びわ湖の内部波の研究(IV)

Abstract

In this paper, some behaviours of the longest period internal seiches in Lake Biwa are treatedby means of the numerical model experiments of two layer Lake Biwa which has a constant depthwith 25 x 62 square meshes of 1 km intervals, providing the initial wind of duration time of 450minutes (NW-1) and 1200 minutes (NW-2) for NW-wind, 450 minutes for SW-wind and ESE-wind respectively.The rotating internal seiches which progress along the lake shore in anticlockwise with theperiod the same as that in the case of no rotation of the earth, are derived from the result of Fourieranalysis of the calculated time series of the internal elevation and velocity at various sampling positionsin the model lake.It is also shown that the phase distribution of the internal elevation which was analyticallyderived from a rotating two layered rectangular model lake, coincides with those obtained from thenumencal model experiments.