Lagrangian stochastic modeling of the coastal fumigation phenomenon
Lagrangian stochastic modeling of the coastal fumigation phenomenon
复制标题
沿海熏蒸现象的拉格朗日随机模型
DOI：
10.1175/1520-0450(1995)034
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
B. Sawford
中科院分区：
文献类型：
--
作者：
A. Luhar;B. Sawford
摘要大多数沿海熏蒸模型使用了有问题的假设，忽略了在扩散过程中起重要作用的一些物理因素。拉格朗日随机扩散模拟技术通过直接根据流动特性计算扩散，有可能以更合理的方式模拟熏蒸现象，从而提供了一种测试和开发更简单模型的工具。建立了一个二维拉格朗日随机模型，该模型包含了流向扩散和垂直和水平方向的流动特性的梯度(即导数)。在建立模型时，忽略了流向和垂直欧拉速度之间的平均相关性。该模式是无量纲化的，然后应用于海岸熏蒸的一些情况下，涉及不同的气象参数和源参数，以调查这些参数如何影响扩散。计算结果表明，流动的梯度随时间的变化而变化。
Abstract Most coastal fumigation models utilize questionable assumptions and ignore some of the physics that play an important role in the diffusion process. The Lagrangian stochastic dispersion modeling technique has the potential for simulating the fumigation phenomenon in a more physically sound way by calculating dispersion directly in terms of flow properties, thereby providing a tool with which simpler models can be tested and developed. A two-dimensional Lagrangian stochastic model incorporating streamwise diffusion and gradients (i.e., derivatives) of flow properties in both vertical and horizontal directions is developed. The mean correlation between the streamwise and the vertical Eulerian velocities is neglected in constructing the model. The model is nondimensionalized and then applied to coastal fumigation for a number of cases involving different values of meteorological and source parameters to investigate how these parameters affect dispersion. The results reveal that the gradients of flow...