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首页> 外文期刊>Aquatic Sciences >Flow-seaweed interactions of Saccharina latissima at a blade scale: turbulence, drag force, and blade dynamics
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Flow-seaweed interactions of Saccharina latissima at a blade scale: turbulence, drag force, and blade dynamics

机译：叶片尺度上Saccharina latissima的流-海藻相互作用：湍流，阻力和叶片动力学

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摘要

Physical interactions between seaweed blades of Saccharina latissima and unidirectional turbulent flow were examined in an open-channel flume, focussing on flow velocities, drag force acting on a blade, and blade reconfiguration. The data reveal that seaweed blades adjust to high-energy flow conditions relatively quickly, efficiently reducing flow-induced drag via compaction, a mechanism of blade reconfiguration. The drag coefficient of blades of S. latissima varied between 0.02 and 0.07 over a range of mean flow velocities from 0.1 to 0.55m/s. Both flow action and blade biomechanical characteristics influenced the blade dynamics, with the flow role being predominant in highly energetic conditions. The interaction mechanisms and their strength were found to be scale-dependent, with the combined effect of reduced mean flow velocity and enhanced turbulence in blade wakes. The thickness of the diffusive boundary layer, an important factor in nutrient uptake from the surrounding water, was estimated to be in the range from 0.010 to 0.067mm. Mechanisms of blade adjustment to the flow and scale-dependent dynamic interactions between blades and turbulent eddies have direct implications for seaweed growth, acclimation, and survival. The estimates of the drag coefficient and the thickness of the diffusive boundary layer will be useful for the development of bio-physical models, environmental assessments, and design of seaweed farms.
机译：在明渠水槽中研究了Saccharina latissima的海藻叶片与单向湍流之间的物理相互作用，重点研究了流速，作用在叶片上的阻力以及叶片的重构。数据显示，海藻叶片可相对快速地适应高能流动条件，通过压实（叶片重新构造的一种机制）有效地减少了水流引起的阻力。在0.1至0.55m / s的平均流速范围内，S。latissima叶片的阻力系数在0.02和0.07之间变化。流动作用和叶片生物力学特性都影响叶片动力学，在高能条件下流动作用占主导地位。已发现相互作用机理及其强度是尺度相关的，同时降低了叶片尾流中的平均流速和湍流。扩散边界层的厚度是周围水吸收养分的重要因素，估计范围为0.010至0.067mm。叶片对叶片流动的调节机制以及叶片与湍流之间的尺度相关动态相互作用，对海藻的生长，驯化和生存具有直接影响。阻力系数和扩散边界层厚度的估计将对生物物理模型的开发，环境评估和海藻养殖场的设计有用。

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