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基于Mike 21软件建立了浮泥输移的平面二维数学模型,计算分析了浮泥河床建桥前后的水流流动形态和床面变形状况。结果表明,建桥前后主槽内河床变形均呈单向冲刷变形,岸滩上则以淤积为主;建桥后主槽冲刷能力增强,但增加幅度不大,且冲刷幅度和水深较均匀,与常见沙质河床的冲刷区别较大;桥墩尾流区内水流流速较小,冲刷幅度较小;桥墩纵横向的阻流范围约在2倍椭圆桥墩的长、短轴位置内。
Based on Mike 21 software, a planar two-dimensional mathematical model of floating mud transport was established and the flow patterns and bed deformation before and after construction of the floating mud river bed were calculated and analyzed. The results show that the deformation of the riverbed before and after the construction of the main channel shows a one-way erosion deformation, while the deposition of the main beach is dominated by siltation. After the construction of the bridge, the scouring ability of the main channel is enhanced, but the increase range is not large and the erosion amplitude and water depth are uniform. Which is different from the common scouring of sandy riverbed. The velocity of flow in the wake of the bridge piers is smaller and the erosion amplitude is smaller. The vertical and horizontal blockage of the bridge pier is about 2 times of the long and short axes of the elliptical piers.