Impact Assessment of Urban Sub-Domain Planning on the Atmospheric Environment

In responese to the planning office′s demands to analyze and evaluate different layouts,based on anurban sub-domain scale meteorology and pollutant diffusion model,a set of index system and evaluating scheme of impact assessment of urban sub-domain planning on meteorology and atmospheric environment is set up.As an example,two layouts of a sub-domain in Beijing are assessed.It shows that,because there is a wide road with grass and trees in east-west direction in the second planning,the road becomes an important channel for airflow.And the wind speed around the road is bigger,air temperature is lower,pollution is weightless,so the strip domain around road is good to the improvement of meteorology and atmospheric environment in the whole sub-domain.In a word,it is available and necessary to evaluate the impact of urban sub-domain planning on meteorology and atmospheric environment. The six assessment indexes(body comfortable degree,walker comfortable degree, ground pollutant concentration,pollutant concentration below the highest building,pollutant concentration on the surface of buildings and diffusion capability) and their weighted factor 0.2,0.1,0.1,0.1,0.1 and 0.4,respectively are firstly pointed out,finally the impact of urban sub-domain planning is evaluated by taking the weighted everaging.and the evaluating method of weighted average is reasonable and practical.