Evaluation of an analytical model for hydraulic resistance of submerged vegetation
Evaluation of an analytical model for hydraulic resistance of submerged vegetation
复制标题
水下植被水力阻力分析模型的评估
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Denie C. M. Augustijn
中科院分区：
文献类型：
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作者：
F. Huthoff;Denie C. M. Augustijn
植被的水力阻力在有植被的溪流或河流的水动力学中起着重要的作用。与通常使用的壁面粗糙度方法相反，植被穿透流场引起阻力，随后引起额外的能量损失。Klopstra等人（1997）推导出了均匀分布的刚性圆柱体区域上方和穿过该区域的流速分布的解析解。在荷兰，该解决方案已被采用作为确定植被粗糙度的标准方法，如洪泛区植被水力阻力手册（货车Velzen等人，2003年）。虽然解析解很好地描述了淹没圆柱绕流，但某些假设使问题过于简单化。本文对这些假设进行了评价，并提出了改进建议。
The hydraulic resistance of vegetation can play a major role in the hydrodynamics of vegetated streams or rivers with extensive natural floodplains. Contrary to commonly used wall roughness methods, vegetation penetrates the flow field causing drag and, subsequently, additional energy losses. Klopstra et al. (1997) derived an analytical solution of the flow velocity profile over and through a field of homogeneously distributed rigid cylinders. This solution has been adopted as a standard method to determine vegetation roughness in the Netherlands as described in the handbook for hydraulic resistance of vegetation in floodplains (Van Velzen et al., 2003). Although the analytical solution gives a good description of the flow over submerged cylinders some assumptions oversimplify the problem. In this paper these assumptions are evaluated and suggestions for improvement are made.