The heavy fogs restrain the vertical diffusion of surface layer pollutant and get tough city...
而大雾天气抑制了近地面层污染物的垂直扩散，加剧了城市污染。
Dynamic equations are used in which the vertical gradient and vertical diffusion are parameterized.
利用动力学方程组，并对其中垂直梯度项和垂直扩散项进行了参数化处理。
The sensitivity of the model to various values of the stratification parameters that influence vertical diffusion has been studied and some preliminary results presented.
研究了计算模型对影响垂直扩散的不同层化参数值的敏感性，提供了一些初步结果。
It is found that the maximum concentration often occurs near source through intensive vertical diffusion, and the values of concentration decrease with the distance downwind rather rapidly.
发现由于垂直扩散较强，最大浓度常于近源处发生，且向下风方浓度衰减较快。
On the other hand, the diffusion is corresponded with coefficients of turbulent diffusion and wind distribution, the range of horizontal diffusion is greater than that of vertical diffusion.
催化剂的扩散与湍流扩散系数、风场分布相对应，水平扩散范围大于垂直扩散范围。
To calculate distribution of sediment concentration in vertical under wave and current, a model of silt diffusion coefficient distribution in vertical is set up.
为了计算波流共同作用下含沙量沿垂线的分布，建立了沿垂线分布的泥沙扩散系数模型。
The greater the vertical maximum gradient is, the more powerful its capability to block vertical heat diffusion from upper water layer to deep water layer.
温度垂直梯度越大，它在垂直方向上阻碍上层海水的热量往深层扩散的能力就越强。
The model consists of a set of algorithms, describing the processes of advection, turbulent diffusion, surface spreading, vertical dispersion, emulsification and evaporation.
该模型包含了一系列的数学公式来描述对流、湍扩散、表面扩展、铅直扩散、乳化和蒸发过程。
It's shown from measured data that the distribution in vertical of sediment diffusion coefficient can be obtained correctly by the model.
实测资料表明该模型可以比较准确地直接计算泥沙扩散系数沿垂线的分布。
Fifthly, based on the consideration of sediment diffusion because of sediment particle interaction, the equation of vertical distribution of sediment concentration is derived.
五是在考虑泥沙颗粒碰撞扩散的基础上，推导了泥沙浓度沿垂线的分布规律。
Different boron diffusion rates can be produced in the lateral and vertical directions and diffusion rates comparable to arsenic can be achieved.
可以在横向和垂直方向中产生不同的硼扩散速率，并且可以实现与砷可比的扩散速率。
This is caused by the tidal diffusion asymmetry in which the vertical turbulence diffusion in the ebb tides is weaker than the one in the flood tides.
动力分析表明这是由潮扩散的不对称性造成的，即落潮期间垂向湍流扩散比涨潮期间弱。
In the diffusion process, CO2 would be moving at its initial velocity in the radial direction and freely diffuse in its vertical directions.
二氧化碳扩散过程中，径向上有一个初始速度，而在横向上表现为自由扩散。
In the diffusion process, CO2 would be moving at its initial velocity in the radial direction and freely diffuse in its vertical directions.
二氧化碳扩散过程中，径向上有一个初始速度，而在横向上表现为自由扩散。
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