Effects of vegetation on turbulent flow structure in groyne fields
Effects of vegetation on turbulent flow structure in groyne fields
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DOI：
10.1080/00221686.2016.1211183
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发表时间：
2017-01
影响因子：
2.3
通讯作者：
A. Sukhodolov;T. Sukhodolova;J. Krick
中科院分区：
文献类型：
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作者：
A. Sukhodolov;T. Sukhodolova;J. Krick
丁坝水流回流促进了细颗粒泥沙的堆积和河岸植被及水生植被的发育。虽然流流体动力学在丁坝领域是正在进行的深入研究的主题，植被对再循环流的影响的知识仍然缺乏。本文报道了野外试验的结果，在一条天然河流，包括大型丁坝模型填充刚性和柔性人工植被。在实验运行人口密度，淹没率，植被类型各不相同。结果表明，植被使双环流水流重新排列为缓慢的回水流。植被的生物力学特性决定了回水流量的大小。主要河流和丁坝场之间的流动界面的水动力学只有轻微的改变植被。在界面和内部植被区的流动分析模型与这些实验结果吻合得很好。
ABSTRACT Flow recirculation in groyne fields promotes accumulation of fine sediments and development of riparian and aquatic vegetation. Although flow hydrodynamics in groyne fields is subject of intensive ongoing research, knowledge of vegetation effects on recirculating flow remains lacking. This paper reports the results of field experiments in a natural river comprising large-scale groyne models populated with rigid and flexible artificial vegetation. In the experimental runs population density, submergence ratios, and vegetation types were varied. The results show that vegetation rearranges twin-circulation flow into slow backwater flow. The magnitude of backwater flow is controlled by the bio-mechanical properties of vegetation. The hydrodynamics of the flow interface between the main river and groyne fields was only slightly altered by vegetation. Analytical models of flow at the interface and inside vegetated areas agree well with these experimental results.