하도육역화 관리를 위한 물골의 수리학적 특성 분석

Abstract

Laboratory experiments were carried out to analyze the hydraulic characteristics of the sub-channel in the flood plain able to manage landforming process. Hydraulic analysis was conducted based on the measurement of mean velocities and turbulent intensities along the sub-channel in the flood plain including the change of an inflow angle. Quantitative characteristics of inflow into the sub-channel in the flood plain were estimated by mean velocities and velocity vectors around the sub-channel in the flood plain obtained using LSPIV. The capacity of sediments flushing in the sub-channel in the flood plain was evaluated with turbulent intensities and friction velocities. It was found that when the elevation of free surface was higher than that of floodplain, the effect of sediments flushing through the sub-channel in the flood plain was not much effective, while it became much effective when the elevation of free surface descended below that of floodplain. In the case of rivers confluence, a conveyance of river branch increases with the increase of an angle of inflow. However, in the case of the sub-channel in the flood plain, the case of inflow angle of was the most effective to flush sediments inside the Mugol because turbulent intensity, friction velocity and unit conveyance became higher than other cases. Results from this study can be used to establish the design guidelines for the sub-channel in the flood plain. In near future, more laboratory experiments conducted with movable bed and fields monitoring would be provided much reliable quantitative analysis of sediments flushing in the sub-channel in the flood plain to resist landforming.