Study on energy dissipation and scour downstream of differential flip bucket in a spillway project

Abstract

The differential flip bucket has efficient energy dissipation capacity, but its impact on downstream erosion cannot be ignored. In this paper, the physical model test is used to analyze the water surface line of the spillway, the flow pattern and velocity distribution of the downstream river channel, and the erosion of the downstream river channel in the form of a differential flip bucket. The influence of the discharge flow on the project is studied, and the rationality of the engineering design is verified. It is found that the flip bucket tongue of the spillway falls into the plunge pool of the downstream river channel, and the flow pattern of the downstream main river channel is gradually stable after a certain distance adjustment. The depth of the stilling basin meets the requirements of energy dissipation and erosion prevention, but local protection is required at the end of the excavation of the downstream left bank slope, or the excavation type of the left bank of the stilling basin is optimized.