1996 Volume 40 Pages 45-50
Relation between flow patterns and stratification process is investigated by the observed data in Lake Onogawa. Transition of the time-scale, 7hr., obtained from coherence of temperature-cross-spectrum and retention time estimated from velocimetry has good agreement to the flow patterns in the lake. The flow in the epilimnion has high-rate horizontal circulation because the lake is used hydropower generation. In the hypolimnion, sediment transportation is observed in closing stage of the fluid in 1995, July, in spite of the flow stagnant in the stratification season.
