琵琶湖南湖の湖流実験

Abstract

The South Basin of Lake Biwa is a typical shallw lake (4 km x15 km X 4m) located near theoutlet (Seta River) of the whole lake. Laboratory experiment on the wind-driven current in thelake was conducted by using a toporographical model and the most fundamental law amongthe rotating similarities. The Rossby numbers due to the longitudinal wind and the outlet dischargeand the vertical Ekman number in the experiments are set to be similar to those in the lake.A slight difference in the surface current patterns was observed between rotating and non-rotating cases. Another difference is noted between the surface and the bottom current patternsexcept for the topographic gyre in the shallower part. Numerical results prepared for theexperiment are also discussed.