The effect of floating objects has so far rarely been considered in flood modelling and risk assessment, despite having significant implications for structural design in flood-prone and coastal areas. In this work, a novel two-way method is proposed to fully couple a discrete element model to a hydrodynamic model to simulate complex debris-enriched flow hydrodynamics. The adopted hydrodynamic model solves the nonlinear shallow water equations (SWEs) using a finite volume shock-capturing numerical method. After being validated against an idealized analytical test, the new coupled model is used to reproduce flume experiments of floating debris driven by dam-break waves. The numerical results agree well with the experimental measurements, demonstrating the model’s capability in simulating the complex fluid–debris interactions induced by violent shallow flows.

中文翻译：

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一种新的一维耦合水动力离散元模型，适用于剧烈浅流中的漂浮碎片

尽管对易受洪水影响和沿海地区的结构设计具有重要意义，但迄今为止，在洪水建模和风险评估中很少考虑浮动物体的影响。在这项工作中，提出了一种新的双向方法，将离散元模型完全耦合到流体动力学模型，以模拟复杂的富含碎屑的流动流体动力学。采用的流体动力学模型使用有限体积激波捕获数值方法求解非线性浅水方程 (SWE)。在经过理想化分析测试验证后，新的耦合模型用于重现由溃坝波驱动的漂浮碎片的水槽实验。数值结果与实验测量吻合，