基于大规模模型测试,为同类的连贯的水坝的一个简化水坝违犯模型由于高出,失败被提出。模型考虑 headcut 作为突破的关键同类的连贯的水坝之一,机制和我们计算的侵蚀用一个基于精力的实验公式的平均时间的 headcut 迁居率。一个数字方法被采用决定起始以水在下游的斜坡搜索位置头和水坝高度,和宽广冠的堰方程被利用模仿违犯流动。限制平衡方法被用来分析违犯的稳定性在违犯期间倾斜过程。一个反复的方法被开发模仿土壤和水的联合过程在每次走。三个水坝违犯盒子的计算结果证明模型,和敏感研究的 reasonability 玷污 erodibility 表演那敏感各开是依赖者测试用例土壤条件。另外,三典型水坝突破当模特儿, NWS 违犯, WinDAM B,和 HR 违犯,也被选择到与建议模型作比较。它被发现那 NWS 违犯可以有大错误因为连贯的水坝自从它使用 noncohesive 沉积运输当模特儿并且不考虑 headcut 侵蚀, WinDAM B 和 HR 违犯认为 headcut 是是的侵蚀突破机制和柄高出的很好同类的连贯的水坝失败,而是外套,建议了模型最好性能。
Based on the large-scale model tests, a simplified dam breach model for homogeneous cohesive dam due to overtopping failure is put forward. The model considers headcut erosion as one of the key homogeneous cohesive dam breaching mechanisms and we calculate the time-averaged headcut migration rate using an energy-based empirical formula. A numerical method is adopted to determine the initial scour position at the downstream slope in terms of the water head and dam height, and the broad-crested weir equation is utilized to simulate the breach flow. The limit equilibrium method is used to analyze the stability of breach slope during the breach process. An iterative method is developed to simulate the coupling process of soil and water at each time step. The calculated results of three dam breach cases testify the reasonability of the model, and the sensitivity studies of soil erodibility show that sensitivity is dependent on each test case's soil conditions. In addition, three typical dam breach models, NWS BREACH, WinDAM B, and HR BREACH, are also chosen to compare with the proposed model. It is found that NWS BREACH may have large errors for cohesive dams, since it uses a noncohesive sediment transport model and does not consider headcut erosion, WinDAM B and HR BREACH consider headcut erosion as the breaching mechanism and handle well homogeneous cohesive dam overtopping failure, but overall, the proposed model has the best performance.