河谷盆地内大气污染物扩散卫生防护距离确定方法的研究

Study on the Method to Determine Health Protection Distance of Air Pollution Diffusion in Valley Basin

讨论河谷盆地特殊复杂地形下,大气污染物扩散卫生防护距离的确定方法。通过采用AERMOD模式计算无组织排放面源距盆地边缘不同距离条件下的卫生防护距离,发现距离盆地边缘2 km以外,盆地的复杂地形对面源污染扩散影响很小,可按照平坦地形对待;距离盆地边缘2 km以内,盆地的复杂地形对面源污染扩散影响显著,此时应采用进一步预测法计算确定卫生防护距离。

This paper discusses the exact method of determining the distance of health protection of air pollutants in special complex terrain of valley basin. By using the AERMOD model,it is calculated the distance of health protection from the edge of the basin with different distance from the edge of the basin,finding that the complex terrain of the basin has little effect on the diffusion of the opposite source pollution from the basin edge of 2 km,it can be treated according to the flat terrain. Within 2 km from the basin edge,the complex terrain obviously impacts the non-point source pollution diffusion and further prediction should be used to calculate and determine the health protection distance.