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Comparison of Two- and Three-Dimensional Flow and Habitat Modeling in Pool–Riffle Sequences
Iranian Journal of Science and Technology, Transactions of Civil Engineering ( IF 1.7 ) Pub Date : 2019-08-13 , DOI: 10.1007/s40996-019-00298-4
Elham Fazel Najafabadi , Hossein Afzalimehr

Pool–riffle sequences are common bed forms in mountain rivers that have a significant effect on hydraulic and hydro-environment characteristics. Relatively few studies exist on the comparison of two and three dimensional modeling for bed forms in gravel channels. In this paper, flow structure and habitat modeling are performed in an urban river, by a two-dimensional depth-averaged finite element and a three-dimensional control volume model. Comparison of results showed that predicted velocities by SSIIM are lower than measurements data, while River2D simulations are at the same of measured magnitude. By comparing River2D-simulated shear stress and field data, we observed that estimated data are representative of field data, while the magnitude may be over-predicted compared with three-dimensional modeling. Habitat modeling showed maximum used area for River2D velocity modeling. In contrast, SSIIM simulations overestimate the depth of used area values in comparison with River2D.

中文翻译:

水池-溪流序列中二维和三维流动和栖息地建模的比较

池-浅滩序列是山区河流中常见的河床形式,对水力和水环境特征有显着影响。对砾石渠道河床形态二维和三维建模比较的研究相对较少。在本文中,通过二维深度平均有限元和三维控制体积模型在城市河流中进行流结构和栖息地建模。结果比较表明,SSIIM 预测的速度低于测量数据,而 River2D 模拟与测量的幅度相同。通过比较 River2D 模拟的剪应力和现场数据,我们观察到估计数据代表了现场数据,而与三维建模相比,其幅度可能被高估。栖息地建模显示了 River2D 速度建模的最大使用面积。相比之下,与 River2D 相比,SSIIM 模拟高估了使用区域值的深度。
更新日期:2019-08-13
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