Internal Waves in Lake Biwa (H) -Numerical experiments with a two layer model-

Abstract

Surface and internal elevations and velocities in two layer Lake Biwa have been calculated numerically using a constant depth model with 25×62 square mesches of 1 km intervals. Linear hydrodynamic equations for the equivalent volume transports and the equivalent elevations were integrated by means of an implicit method, taking into account wind stress, bottom stress and Colioris force. In the present experiment, the case of duration time of 450 minutes for a NW-wind of 5 m/sec and of interface position of 17.5 m at the equilibrium and density difference of 2.5×10^-3 g/cm^3 between upper and lower layers was treated. From the results of Fourier spectrum analysis for the calculated time series of elevation and velocity at various sampling positions in the model lake, the long period internal Kelvin waves and internal Poincare waves were distinguished.