Flow resistance law in open-channel flows with rigid and flexible vegetation
Flow resistance law in open-channel flows with rigid and flexible vegetation
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发表时间：
2010
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通讯作者：
T. Okamoto;I. Nezu
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作者：
T. Okamoto;I. Nezu
在实际河流中观察到大量水生植物，它们具有改善水质的潜力。在植被边缘附近产生大尺度相干涡旋，主导动量和标量输运。因此，估算植被水流阻力在河流管理中具有重要意义。在这样的植被明渠流，植被元素的几何形状（形状，大小，灵活性和植被密度）和湍流特性影响的水动力阻力显着。然而，植被运动和水流阻力特性之间的任何重要关系尚未建立。因此，在本研究中，我们强调这些重要的课题，并测量瞬时速度结构和相干运动在明渠水流与灵活的植被使用PIV技术。结果揭示了柔性植物运动与流动之间的流体力学相互作用。
A lot of aquatic plants are observed in actual rivers and they have a potential to improve water quality. A large-scale coherent vortex is generated near the vegetation edge, which dominate the momentum and scalar transport. Thus, estimating the flow resistance of vegetated flows is of great importance in river management. In such vegetated open-channel flows, both the geometry of the vegetation elements (shape, size, flexibility and vegetation density) and turbulence characteristics affect the hydrodynamic resistance significantly. However, any important relation between the vegetation motion and the flow resistance property is not yet established. Therefore, in the present study, we highlighted these important topics and measured the instantaneous velocity structure and coherent motion in open-channel flows with flexible vegetation by using PIV technique. As the results, the hydro-mechanic interaction between the flow and flexible plant motion was revealed.