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首页> 外文期刊>Meteorology and Atmospheric Physics >Formulation of stability-dependent empirical relations for turbulent intensities from surface layer turbulence measurements for dispersion parameterization in a lagrangian particle dispersion model
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Formulation of stability-dependent empirical relations for turbulent intensities from surface layer turbulence measurements for dispersion parameterization in a lagrangian particle dispersion model

机译：根据拉格朗日粒子弥散模型中用于弥散参数化的表面层湍流测量公式，得出湍流强度的依赖于稳定性的经验关系

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摘要

Season- and stability-dependent turbulence intensity (sigma (u) /u (*), sigma (v) /u (*), sigma (w) /u (*)) relationships are derived from experimental turbulence measurements following surface layer scaling and local stability at the tropical coastal site Kalpakkam, India for atmospheric dispersion parameterization. Turbulence wind components (u', v', w') measured with fast response UltraSonic Anemometers during an intense observation campaign for wind field modeling called Round Robin Exercise are used to formulate the flux-profile relationships using surface layer similarity theory and Fast Fourier Transform technique. The new relationships (modified Hanna scheme) are incorporated in a Lagrangian Particle Dispersion model FLEXPART-WRF and tested by conducting simulations for a field tracer dispersion experiment at Kalpakkam. Plume dispersion analysis of a ground level hypothetical release indicated that the new turbulent intensity formulations provide slightly higher diffusivity across the plume relative to the original Hanna scheme. The new formulations for sigma (u) , sigma (v) , sigma (w) are found to give better agreement with observed turbulent intensities during both stable and unstable conditions under various seasonal meteorological conditions. The simulated concentrations using the two methods are compared with those obtained from a classical Gaussian model and the observed SF6 concentration. It has been found that the new relationships provide comparatively higher diffusion across the plume relative to the model default Hanna scheme and provide downwind concentration results in better agreement with observations.
机译：取决于季节和稳定性的湍流强度（sigma（u）/ u（*），sigma（v）/ u（*），sigma（w）/ u（*））关系是根据表面层缩放后的实验湍流测量得出的和印度热带沿海站点Kalpakkam的局部稳定性，用于大气弥散参数化。在强烈的观测运动（称为Round Robin Exercise）中，通过快速响应的超声波风速计测量的湍流风分量（u'，v'，w'），使用表层相似性理论和快速傅立叶变换来公式化通量-剖面关系。技术。新的关系（修改后的Hanna方案）被纳入拉格朗日粒子色散模型FLEXPART-WRF中，并通过在Kalpakkam进行场示踪色散实验的仿真进行了测试。对地面假设释放的羽流弥散分析表明，相对于原始的Hanna方案，新的湍流强度公式在羽流上提供了更高的扩散率。发现在各种季节性气象条件下，在稳定和不稳定条件下，σ（u），σ（v）和σ（w）的新公式与观测到的湍流强度具有更好的一致性。将使用这两种方法的模拟浓度与从经典高斯模型获得的浓度和观察到的SF6浓度进行比较。已经发现，相对于模型默认的汉娜方案，新的关系提供了相对较高的整个羽流扩散，并提供了顺风集中的结果，与观测结果更好地吻合。

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