Abstract

A regulation engineering laid in a branch will make the changes of the cross section and the resistance of this branch. The variations of the section and the resistance cause the variation of water level in bifurcation and diversion discharge in each branch. The formula used to calculate the local resistant and the backwater caused by the regulation engineering are derived this paper. According to the site of the engineering laid in branch, the water level (or backwater value) at the bifurcation region and the diversion discharge of each branch can be determined. As an example, the above methods are used to calculate the water level and diversion discharge after regulation engineering in branching river model. The comparison between the calculation results with the measurements in shows that the calculation value agrees well with the measure value in model.

Keywords: The braided river reach, the discharge ratio, the water head loss, regulation engineering