Landslide dam, always triggered by the strong earthquake and heavy rain, is a common natural disaster around the world. In this study, a coupled model was built by combining DB-IWHR model and the two-dimensional hydrodynamic model to simulate the landslide dam flood discharge. We mapped the maximum Baige landslide dam flood inundated area based on Gaofen-1 imagery, and then simulated the process of Baige landslide dam flood discharge using this coupled model. It was proved that, with 80.05% F values, the coupled model was suitable to simulate the process of landslide dam flood discharge. Lastly, multiple scenarios were simulated respectively by setting varying width and depth of spillway. The results of scenarios 1–4 indicated that spillway width presented low sensibility to the peak flow in spillway and the time of its arrival, and similarly to the water depth at river cross-section and the inundated area. Water depth at river cross-section and the inundated area decreased as spillway width increased. Even if spillway width varied at 10 m interval, the average variation of water depth was less than 1.82 m and the variation of inundated area was less than 2.85%. However, the results of scenarios 5–8 indicated that spillway depth was sensitive to the peak flow in spillway and its arrival time, and also to water depth at river cross-section and the inundated area. Water depth at river cross-section and the inundated area increased first and then started to drop with spillway depth kept decreasing. When spillway depth varied at only 2 m interval, the average variation of water depth at river cross-section basically exceeded 2 m and the variation of inundated area was more than 2.85%.

中文翻译：

---

模拟滑坡坝洪水泄洪的耦合模型研究-以金沙江白鸽滑坡坝为例

滑坡水坝总是由强地震和大雨引发，是世界范围内常见的自然灾害。在这项研究中，结合DB-IWHR模型和二维水动力模型建立了一个耦合模型，以模拟滑坡坝的洪水流量。我们基于高分一号影像绘制了最大的白格滑坡坝洪水泛滥区图，然后使用该耦合模型模拟了白格滑坡坝洪水泛洪的过程。事实证明，含80.05％F值，耦合模型适用于模拟滑坡大坝泄洪过程。最后，通过设置不同的溢洪道宽度和深度分别模拟了多种情景。方案1-4的结果表明，溢洪道宽度对溢洪道的洪峰流量及其到达时间不敏感，与河流横截面和淹没区域的水深相似。随着溢洪道宽度的增加，河流断面和淹没区域的水深减小。即使溢洪道宽度以10 m的间隔变化，水深的平均变化也小于1.82 m，淹没面积的变化小于2.85％。但是，场景5–8的结果表明，溢洪道深度对溢洪道的峰值流量及其到达时间敏感，以及河流断面和淹没区域的水深。河流断面和淹没面积的水深先增大，然后开始下降，同时溢洪道深度不断减小。当溢洪道深度仅以2 m的间隔变化时，河道断面的水深平均变化基本超过2 m，淹没面积的变化大于2.85％。