LES of turbulent surface shear stress and pressure-gradient-driven flow on shallow continental shelves
LES of turbulent surface shear stress and pressure-gradient-driven flow on shallow continental shelves
复制标题
浅层大陆架湍流表面剪应力和压力梯度驱动流的 LES
DOI：
10.1007/s10236-011-0450-3
复制
发表时间：
2011
期刊：
影响因子：
2.3
通讯作者：
A. Tejada
中科院分区：
文献类型：
--
作者：
G. Martinat;Ying Xu;C. Grosch;A. Tejada
浅大陆架上的湍流剪切流（这里浅意味着与固体、无滑动底部的相互作用很重要）非常重要，因为大陆架上的潮汐和风力驱动的流动是气-海界面上动量、热量和质量（气体）转移的驱动力。这些湍流起着重要的作用，因为垂直混合和海流是大陆架上沉积物和生物活性物质迁移的载体。理解这类流动的动力学是复杂的，因为存在自由表面，也因为流动可以由压力梯度（潮流），自由表面的应力（风驱动的电流）或两者的组合驱动。此外，可以通过存在可以诱导朗缪尔循环的波场来改变流动（朗缪尔，科学87：119-123，1938）。大涡模拟被用来量化的压力梯度和风切变的湍流的独特结构的影响。从这些计算中，获得了对压力驱动和风力驱动流的湍流的物理学的理解，它们如何在法向或切向方向上相互作用，以及波强迫对这些流的影响。
Turbulent shear flows on shallow continental shelves (here shallow means that the interaction with the solid, no-slip bottom is important) are of great importance because tide- and wind-driven flows on the shelf are drivers of the transfer of momentum, heat, and mass (gas) across the air–sea interface. These turbulent flows play an important role because vertical mixing and current are vectors for the transport of sediment and bioactive material on continental shelves. Understanding the dynamics of this class of flows presents complications because of the presence of a free surface and also because the flow can be driven by a pressure gradient (a tidal current), a stress at the free surface (a wind-driven current), or a combination of both. In addition, the flow can be modified by the presence of a wave field that can induce Langmuir circulation (Langmuir, Science 87:119–123, 1938). Large eddy simulation is used to quantify the effects of pressure gradient and wind shear on the distinctive structures of the turbulent flow. From these computations, an understanding of the physics governing the turbulence of pressure-driven and wind-driven flows, how they can interact in a normal or a tangential direction, and the effect of wave forcing on these flows is obtained.