摘要
露天煤矿排土场大风起尘为露天煤矿扬尘排放的主要部分。为准确计算露天煤矿排土场扬尘排放量,文中借鉴WRF模式中的土壤风蚀起尘方法,在测定矿区排土场土壤粒径分布,获取土壤湿度、摩阻风速等气象条件后,计算并分析锡林格勒露天煤矿排土场扬尘排放量。计算结果表明摩擦速度u*为确定排土场扬尘排放量大小的主要因素。当U*达到0.62m/s后,可观测到明显的起尘过程;从U*和10m高处风速对比关系可知,对于露天煤矿排土场,其起尘风速约为6.6m/s。当摩擦速度u*为1m/s时,"使用中"排土场的尘排放量为0.01g/m^3/s。当摩擦速度u*为1.2m/s时,"使用中"排土场的尘排放量以指数形势增加为0.03g/m^3/s。文中进一步利用扩散模型ADMS估算了排土场扬尘对市区扬尘污染的贡献。模拟的2013年4月使用中的排土场扬尘污染对锡林浩特的贡献为,平均状况下在锡林浩特市区西部尘污染浓度达0.04mg/m^3。在大风起尘日子城区部分浓度可达0.4mg/m^3。
The heavy wind dust from the waste dump of surface coal mine is the main part of the dust pollution in the surface coal mine. For accurate calculation of surface coal mine dust emissions, this study referred to the methods of soil wind erosion in the WRF model to determine the soil particle size distribution in mining area, obtain soil moisture, friction wind speed and other meteorological conditions, and calculate and analyze the cylinder surface coal mine dust exhausting quantity. The calculation results show that the friction velocity u, was the main factor for determining the size of mine dust emissions. When U, was 0. 8m/s, dusting process was observed clearly. The contrast between U, and 10m high wind speed showed the threshold velocity （ 10m high wind speed） was about 8m/s. When the friction velocity u, was 1m/s, the dust emissions was 0.01g/m3/s. When the friction velocity u, was 1.2m/s, the dust emissions increased to 0.03g/m3/s. We estimated further the contribution of waste dump dust to the urban dust pollution by using of diffusion model ADMS.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2017年第6期160-165,共6页
Journal of Arid Land Resources and Environment
