The results also provide the useful guideline and references to a certain extent for city planning and designing as well as the diffusion and cumulation of air pollutants around buildings.
数值模拟表明了风遇到建筑物时的绕流情况，研究成果可为城市规划和住宅小区建筑物的优化设计以及分析建筑物周围空气污染物的扩散和累积提供参考和应用基础。
The movement and diffusion process of pollutants in current of water are affected by water temperature, local flow velocity and direction, stream shape, and so on.
由于污染物在水流中的扩散迁移过程受水温、局部流速与流向、河道形状等因素的影响。
Diffusion and transference of organic pollutants in water environment is a non-linear process which will be affected by many factors.
水环境中有机污染物的扩散迁移是一个由多种因素影响的复杂的非线性过程。
In this paper, the diffusion model and the theoretic calculation method of welding dust are given by gradient transportation theory and box model for outdoor atmospheric pollutants.
这里利用成熟的室外大气污染物扩散理论- 梯度输送理论和箱模式理论，提出焊接烟尘在室内的扩散模式和浓度分布的理论计算方法。
Numerical simulation of pollutants' diffusion in air has been adopted widely, but the false diffusion occurring in simulation is always an important factor affecting the accuracy of the results.
用数值模拟的方法预测污染物在大气中的扩散已经被广泛采用，但数值模拟产生的伪扩散一直是影响模拟结果精度的重要因素。
Wind speed played a leading role and other meteorological factors also have some effect, which resulted from the influence of the meteorology on diffusion, transmission, elimination of air pollutants.
结合风速等气象要素对污染物扩散、传输和清除进行的分析可知， 监测期间风速对污染物浓度分布起主导作用， 气压等其它气象状况对污染物浓度分布也有一定的影响。
To dispose of the flow field of mesoscale cities, in order to make the diffusion model be used to exactly calculate the concentration distribution of the pollutants;
②对中尺度城市的流场进行处理，使之用于扩散模型后更能准确反应污染物的浓度分布；
Air pollution prediction is a direct problem, and deriving diffusion coefficients from the concentration of pollutants is an inverse problem.
空气污染预报属于正问题，而从污染物浓度来求解扩散系数则属于反问题。
Air pollution prediction is a direct problem, and deriving diffusion coefficients from the concentration of pollutants is an inverse problem.
空气污染预报属于正问题，而从污染物浓度来求解扩散系数则属于反问题。
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