Numerical modelling of uncongested wood transport in the Rienz river
Numerical modelling of uncongested wood transport in the Rienz river
复制标题
里恩茨河畅通无阻的木材运输的数值模拟
DOI：
10.1007/s10652-019-09707-8
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发表时间：
2019
影响因子：
2.2
通讯作者：
F. Comiti
中科院分区：
文献类型：
--
作者：
E. Persi;G. Petaccia;S. Sibilla;A. Lucía;A. Andreoli;F. Comiti
参考研究规则和无分支圆柱形木质样品运动的现场实验，采用欧拉-拉格朗日模型ORSA2D_WT来模拟无拥塞的木材运输。该模型通过计算流动施加的水动力来计算大型木材元素的夹带、运输和沉积。实验测井位置和位移被作为数值模型首次应用于实际测试案例的参考。特别注意大石块的存在，它们与漂浮的木材相互作用，并在数值域中表示为近 3D 元素，以考虑它们对水流和原木的影响。现场数据与数值模拟的比较表明，该模型未能准确复制每条测井轨迹。然而，当焦点转移到整组日志的行为时，该模型似乎很好地模拟了日志更容易停止的区域。模型中实现的木材密度强烈影响单根原木位移的结果，强调了正确估计该参数对于大型木材模拟的重要性。
The Eulerian–Lagrangian model ORSA2D_WT is employed for the simulation of uncongested wood transport, with reference to a field experiment that studied the motion of regular and unbranched cylindrical wooden samples. The model calculates the entrainment, transport and deposition of large wood elements by computing the hydrodynamic forces exerted by the flow. The experimental log positions and displacements are taken as a reference for the first application of the numerical model to a real-scale test case. Special attention is paid to the presence of large boulders, which interact with floating wood and are represented as nearly 3D elements in the numerical domain, to take into account their effect both on the flow and on the logs. The comparison between the field data and the numerical simulation shows that the model fails to replicate exactly each log trajectory. However, when the focus moves to the behaviour of the entire group of logs, the model appears to simulate quite well the areas where logs are more prone to stop. The wood density implemented in the model strongly affect the results in terms of single log displacement, emphasizing the importance of the correct estimation of this parameter for large wood simulation.