Abstract: The boil-eddy flow is one of the typical bad flow obstructing navigation,which is the reason why the navigation is obstructed and even maritime damages happen in the mountain rivers.So,making clear the formation condition,reasons and the main influencing factors on the boil-eddy flow is the premise of eliminating the boil-eddy trouble.In this paper,characteristics of the boil-eddy flow in deep pool and detached rock along straight reach have been studied by generalized model tests of 32 groups in flume.Thro...