Numerical investigation on the evolution of landslide-induced river blocking using coupled DEM-CFD
Numerical investigation on the evolution of landslide-induced river blocking using coupled DEM-CFD
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使用耦合 DEM-CFD 进行滑坡引发的河流阻塞演变的数值研究
DOI：
10.1016/j.compgeo.2021.104101
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发表时间：
2021-06
影响因子：
5.3
通讯作者：
Zhang Yan-jun
中科院分区：
文献类型：
--
作者：
Nian Ting-kai;Wu Hao;Takara Kaoru;Li Dong-yang;Zhang Yan-jun
本文提出了一个双向耦合离散元法（DEM）和计算流体动力学（CFD）的方案，定量研究滑坡阻塞河流的演变。颗粒-流体相互作用被认为是通过交换相互作用力，如拖曳力，浮力和升力，这是描述河流阻塞的演变是必不可少的。耦合的DEM-CFD方案首先基准通过比较不同直径的颗粒的沉降速度与相应的实验。该方案，然后调查的影响，河流流速，河流水深，滑坡速度，和滑坡量的河流阻塞的演变。基于对河道阻塞机理的认识，提出了河道阻塞系数Ic来预测河道阻塞。结果表明，河水降低了滑坡颗粒的平均法向接触力，导致河水迅速冲走它们。沿河谷方向的存款速度沿着与河流水深、流速呈正相关，与滑坡初始速度、滑坡体体积呈负相关。研究表明，当Ic> 1时，河流完全阻塞。否则，河流是畅通的或部分堵塞的。
This paper presents a two-way coupled discrete element method (DEM) and computational fluid dynamics (CFD) scheme to quantitatively investigate the evolution of landslide-induced river blocking. The particle–fluid interaction is considered by exchanging interaction forces, such as drag force, buoyancy force, and lift force, which are essential for describing the evolution of river blocking. The coupled DEM-CFD scheme is first benchmarked by comparing the settling velocities of particles with different diameters with corresponding experiments. The scheme is then employed to investigate the effects of river flow velocity, river water depth, landslide velocity, and landslide volume on the evolution of river blocking. Based on the understanding of the river blocking mechanism, we propose a river blockage coefficient (Ic) to predict the river blocking. The results indicate that river water reduces the mean normal contact force of landslide particles, leading to river water quickly washing them away. The deposit velocity along the direction of the river valley is positively correlated with river water depth and river flow velocity but negatively correlated with the initial landslide velocity and landslide mass volume. The study indicates that whenIc> 1, a river is completely blocked. Otherwise, a river is unblocked or partially blocked.
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