基于线性冲蚀公式的二维非黏性土石坝溃决模型

基于线性冲蚀公式建立二维非黏性土石坝溃决模型. 所建模型利用线性冲蚀公式建立床面冲刷率与水流切应力的关系以计算坝体变形，无须应用输沙率公式和求解泥沙输移方程. 与现有精细物理模型相比，所建模型更简单，计算效率更高. 利用2个不同形式的算例，验证边坡坍塌算法的有效性；将所建模型分别应用于一维和二维非黏性土石坝漫顶实验，模型计算的坝顶高程、溃口最终宽度和峰值流量等关键指标值与测量值吻合良好，表明该模型能够较为准确地模拟非黏性土石坝溃坝. 对模型关键参数进行敏感性分析，分析不同参数对计算结果的影响.

2D non-cohesive earthen embankment breach model based on linear erosion formula

A two-dimensional non-cohesive earthen embankment breach model was developed based on a linear erosion formula. Instead of using sediment transport rate and solving sediment transport equations, the relationship between the bed erosion rate and the flow shear stress was directly established based on a linear erosion formula, to calculate the embankment breach. Compared to the existing detailed physically based model, the proposed model was simpler and more efficient. Firstly, two different examples were used, and the validity of a bed slope failure algorithm was verified. Then, the proposed model was applied to simulate the overtopping breach experiments of one-dimensional and two-dimensional non-cohesive earthen embankment. Results showed that the calculated values of the model were all in good agreement with the measurements at the crest elevation, the final breach width and the peak discharge. And the breach of non-cohesive earthen embankment was simulated fairly accurately by the model. Finally, a sensitivity analysis of key parameters was performed to investigate the effects of different parameter values on the simulated results.