Internal Waves in Lake Biwa (I) -The Responses of the Thermocline to the Wind Action-

Abstract

In the recent preliminary observation of the internal waves in Lake Biwa, the longitudinal inclination of the thermocline due to the wind with the north component and the initial stage of the free oscillation after the wind has ceased, are observed. The period of the first swing was about 56 hours and this period just coincides with the one calculated for a simplified two layer lake. Another small periodic change with the period of 10 hr was also observed. And it is concluded that this oscillation corresponds to the transverse internal seiches under geostrophic effects.