兰州市新区规划气候条件评估分析

Evaluation and Analysis on Climate Condition for New District Planning of Lanzhou City

利用1978-2007年兰州市永登县气象站观测资料及周围部分区域观测站资料,对兰州新区各项气象要素进行了分析,并采用RAMS模式,模拟了兰州地区在不同气象扩散条件(有利于扩散、一般扩散条件及不利于扩散)天气背景情况下的污染情况。结果表明,兰州污染最严重的地区在西固区,兰州西部的红古区和北部的中川、皋兰是污染较轻的地区,而位于南部的榆中则易受污染物的影响。利用HYSPLIYT模型,对各代表点采用相同的污染源,分析了由于气象条件不同造成的各代表点污染扩散的差异,在轻重两种典型的污染天气背景条件下确定了各代表点在24h内的大气扩散能力与污染气团传输路线,发现兰州北部的大气扩散能力好于南部,西部好于东部,因此兰州老城区不宜规划污染企业;而位于兰州新区永登县秦川镇附近区域较位于皋兰县西岔镇附近区域更适于规划重工业企业。

The various meteorological factors in Lanzhou are analyzed using the meteorological data from the stations of Lanzhou, Yongdeng during the period 1978-2007, and the pollution situation of Lanzhou region is simulated from RAMS model under different weather diffusing conditions. The result show that the most polluted areas of Lanzhou is in Xigu District, and Honggu District and Gaolan District s are lightly polluted areas, but Yuzhong District is easily affected by pollutant. In addition, HYSPLIYT model is used to study the diffusion difference among these stations in the Lanzhou new district using the same pollution source and determine their pollution diffusion abilities and the transmitting route for the polluted air mass under heavy and light pollution situations at these representative sites within 24 h in the different weather conditions. It is found that the atmospheric diffusion ability of northern Lanzhou is bet- ter well than that of its South, that of West is better than East. Therefore, the old city of Lanzhou should not be arranged in polluting enterprises. The area near Qinchuan town of Yongdeng county of the Lanzhou new district is located to be more suitable for the arrangement of heavy industrial enterprisesn than that of in area of Xicha town of Gaolan county.