天气风对沿岸环流动力学的影响
The Influence of Synoptic Wind on Coastal Circulation Dynamics
摘要：
特别具有挑战性的类的非均匀表面是那些强烈的二次环流产生的，潜在的主导流动动力学。在这项研究中，我们专注于陆海空风环流（LSB）所造成的地面热力对比的存在下，天气压力强迫增加。的相对重要性和方向的热和天气强迫测量通过两个无量纲参数：一个散装理查森数（镁是地转风的大小和Wstar对流浮力速度尺度），和海岸和地转风之间的角度α。大涡模拟揭示了各种制度的出现，其中的动态被证明是不对称的α。沿岸的情况下，深LSB的结果类似于静止的情况下（零天气背景），无论镁的强度。跨岸模拟显示出一个环流圈，随着天气强迫的增加，环流圈的高度会降低。然而，在最高的天气风模拟，环流单元平流远离海陆风，而浅环流持续的陆地到海洋的情况下。将内部参数Qshore（净岸体积通量）和qshore（净岸平流热通量）与外部输入参数Mg和Wstar相关联的尺度分析导致了一个简洁的岸通量模型，该模型也有助于解释所识别的LSB的物理含义。最后，垂直配置文件的海岸正常的速度和海岸平流热通量，与援助的k-均值聚类，独立分类的LSB在（Ri，α）制度空间图（规范LSB，海驱动LSB，陆驱动LSB，平流LSB），证实我们的视觉分类。
英文摘要：
Particularly challenging classes of heterogeneous surfaces are ones where strong secondary circulations are generated, potentially dominating the flow dynamics. In this study, we focus on land-sea breeze circulations (LSBs) resulting from surface thermal contrasts in the presence of increasing synoptic pressure forcing. The relative importance and orientation of the thermal and synoptic forcings are measured through two dimensionless parameters: a bulk Richardson number (Mg is the geostrophic wind magnitude and Wstar a convective buoyant velocity scale), and the angle alpha between the shore and geostrophic wind. Large eddy simulations reveal the emergence of various regimes where the dynamics are shown to be asymmetric with respect to alpha. Along-shore cases result in deep LSBs similar to the quiescent scenario (zero synoptic background), irrespective of the strength of Mg. Across-shore simulations exhibit a circulation cell that decreases in height with increasing synoptic forcing. However, at the highest synoptic winds simulated, the circulation cell is advected away with sea-to-land winds, while a shallow circulation persists for land-to-sea cases. Scaling analysis that relates the internal parameters Qshore (net shore volumetric flux) and qshore (net shore advected heat flux) to the external input parameters Mg and Wstar results in a succinct model of the shore fluxes that also helps explain the physical implications of the identified LSBs. Finally, the vertical profiles of the shore-normal velocity and shore-advected heat flux are used, with the aid of k-means clustering, to independently classify the LSBs in the (Ri, alpha) regime space diagram (canonical LSB, sea-driven LSB, land-driven LSB, and advected LSB), corroborating our visual categorization.
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