INTERNAL WAVE MODE IN LAKE BIWA

Abstract

 In Lake Biwa, stratification is generated due to water temperature differences excluding well-mixed winter season. The change in water density induces the formation of internal waves when wind stress is applied to the lake surface.The study aims to elucidate the internal wave mode in Lake Biwa, theoretically and numerically, with the Coriolis, using the vertical water temperature profile obtained by field observations. The results of the field observations revealed that the Kelvin and Poincaré internal waves were induced based on the topographical features under the Coriolis effect. Theoretical solutions also showed internal wave modes comparable to the numerical simulations. Estimated internal wave modes numerically and theoretically agreed with the field observations. This suggests that defining the internal wave periods in Lake Biwa using theoretical solutions enables easy estimation of the internal wave modes.