Author(s): Yan Pei; Wei Bingqian; Liu Rui; Pang Jie
Linked Author(s):
Keywords: Bend; Transition curve; Circulation; Deformation of erosion and deposition; Three-dimensional numerical simulation
Abstract: The study on bend flow has an important significance to the development of rivers, sediment protection and river evolution. If the numerical simulation can be effectively used to reveal the law of flow and scouring and silting on the surface, it will save a lot of manpower, financial resources and time. In this study, two kinds of curves are examined: slow-round-slow bend and symmetric convex curves, which can be introduced in order to decrease the impact force of the current and to prevent scouring along the river bed, dike and feet of the dike. Through numerical analysis some results are concluded: the ultra-high and horizontal surface slope of the slow-round-slow bend and symmetric convex curves are significantly reduced compared with the round bend; in addition to the corner imports, such as on a cave bank, the bottom velocity of slow-round-slow bend and symmetric convex curves is less than that of the round bend, convex bank of imports and cornering near the top cross-section, the flow velocity near the bottom of these two bends is significantly smaller than that of the round bend; and, the deep groove of these two inserted with graded curves is obviously shallower than the round bend from the figure of vertical and horizontal erosion and deposition on the bed surface.
Year: 2015