中文摘要：

基于Flow-3D软件,采用RNG k-ε模型和VOF法,建立了分析溃坝洪水的水流三维数学模型,计算了溃坝洪水通过90°直角弯道模型试验并进行验证,计算结果表明物理试验与数值模拟结果中渠道内洪水水面线与试验实测值吻合度很高,说明所建模型的正确性。随后采用所建数学模型模拟计算了某实际弯曲河流的溃坝洪水传播过程,计算结果表明河流对溃坝波传播的影响随着河道弯曲率的增大而减小,溃坝波在通过弯道时在凹岸处水位高于凸岸,在实际工程中应注意对河道凹岸的加高,并且随着河道曲率的减小两岸的水位高差逐渐增大,凹岸所需加高的高度也越大。

英文摘要：

Based on the Flow-3D software,a 3D numerical model for studying dam-break flood was established by using RNG k-ε model and VOF method in this paper. The model was validated with test of dam-break flow propagation in channel with 90° bend. Calculation results showed that water surface profile were in good agreement with the value of hydraulic model tests. Then dam-break flow propagation in a river was simulated by using this hydraulic model and results showed that the impact on dam break wave propagation of river decreases as the river bend rate increased. Water level of concave bank was higher than convex bank during dam break waves through bend. In the actual project we should pay more attention to the concave bank heightening. Water level elevation between two banks gradually increased with the decreasing of the river bend curvature,and the concave bank required more highly heightening.