Research on the Water Diversion Ratio Characteristics of the Plain River Network--A Case Study of the Channel in Zhangjiagang

Abstract

This study combined numerical simulation with field observation, and this study took the classical bifurcated river of Zhangjiagang as an example and built a two- dimensional hydrodynamic model of the river course upon it. In addition, this project studied the influencing factors and the mechanism of the flow diversion ratio in the plain river network and established a formula to estimate the flow diversion ratios in plain river networks with ridge regression. The results show that: (1) the water diversion ratio in plain rivers has a positive correlation with the roughness, the ratio of the width of the tributary to that of the main channel and the water level differences. The water diversion ratio has a negative correlation with the mainstream discharge. (2)The mainstream discharge and the ratio of the width of a tributary to that of the main channel are two dominant factors ofthe flow diversion ratio.(3)By establishing an equation for the water diversion ratio, the water diversion ratio in the plain river network can be predicted.