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结合物理模型试验建立平面二维水流数学模型,采用高分辨率有限体积格式计算漫顶溃堤洪水演进过程,并针对不同时段溃口形态建立三维几何模型进行水力参数变化规律数值模拟.研究结果发现,堤防溃决属溯源冲刷,与流速密切相关;溃决过程外江水位平稳下降,内江水位先上升后逐渐稳定,内外江水位差随溃口展宽逐渐减小;壁面剪切应力及动水压力较大区域集中在溃口内江侧与河底连接处,且随溃决过程逐渐减小.
Combined with the physical model test, a planar two-dimensional flow mathematical model was established and the high-resolution finite volume format was used to calculate the flood evolution process of the overburden embankment. A three-dimensional geometric model was built for the different time periods to simulate the variation of hydraulic parameters. The embankment collapse is a trace of source erosion, which is closely related to the flow velocity. The water level of the outer river is declining steadily in the process of the collapse, the water level of the inner river rises first and then gradually stabilizes, and the water level difference between the inner and outer rivers decreases gradually with the breaching of the breach. In the cessation of the river side and the river at the junction, and with the collapse process gradually reduced.