The discharge ratio R of mainstream to its confluent tributary is the most key factor that affects
hydraulic behavior of the confluence. With the total discharge Qt increasing, the the discharge ratio
distribution range narrow down, the discharge ratio of peak frequency enlarges Rp and the discharge ratio
R minish.
With the discharge ratio R increasing, the water surface slope of Yangtze River Jc increases, but that of
Jialing River Jj decreases. The water surface slope in mixing zone Je is direct proportion to Qc and
negative correlation to R.
The bigger is discharge ratio R, the closer the junction point is to shazui near Chaotianmen, the nearer
junction line is on the side of Jialing River, and the smaller of width of backflow is.rge ratio.