Preliminary study on the erosion impact of breach floods based on numerical simulation and physical model test

Abstract

This paper established the combination model of numerical simulation and physical model test to fully demonstrate the influence of dike-breach floods on the pipeline. Numerical models were used to analyze the effects of different flooding schemes with different breach locations and different breach widths on the engineering line. The results show that the large flow velocity is mainly distributed in the vicinity of the breach for each scheme, and the influence is most serious when the breach occurs near the pipeline. Comparing the floods of different magnitudes comprehensively, the greater is the flood magnitude, the more serious is the influence on the pipeline. As the breach width increases, most of results show some characteristics, such as the decrease of the maximum flow velocity at the breach, the increase of the maximum flow velocity in other areas of the pipeline, the increase of the maximum flow velocity contour range, and the decrease of the large flow velocity duration. The plane and range of the scouring pit were obtained by physical model test. Considering results of numerical and physical model comprehensively, the protection ranges of different grades along the project were determined according to different ranges of impact velocities and scouring pits. The research results can provide reference for the protection of the pipeline in the Jiahetao area.