不同精度地形数据对AERMOD模型预测面源扩散的影响
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摘要
STRM是迄今为止现势性最好的全球性数字地形数据,其高精度地形数据逐渐在各领域得到研究与应用。通过STRM得到90 m和30 m两种精度的DEM地形数据,设计多组地形-地表类型组合方案,利用AERMOD模型模拟一面源的扩散情况,讨论高低精度地形数据对面源扩散的影响,并探索其与反照率、波文比、粗糙度等地表参数因子的关系。研究结果表明,提高地形数据精度后:最大小时浓度值有所增加,尤其是复杂地形,平坦地形最大小时浓度值变化幅度与地表粗糙度呈负相关;最大达标距离与地表粗糙度成反比,而最大达标距离变化幅度与地表粗糙度成正比。
STRM is by far the best available global digital terrain data,and its high-precision terrain data is gradually being studied and applied in various fields. In this paper,based on two kinds of terrain data resolution( 90 m,30 m),we used the AERMOD model to predict the Non-point source diffusion to find differences in the prediction of non-point source diffusion resulting from terrain data accuracy.The results showed that after using high-precision terrain data:( 1) the maximum hourly concentration value increased with the changing range of 72%-219% in complex terrain( except scheme 15). This Range of change was significantly related to the surface roughness in flat terrain.( 2) The maximum standard distance was inversely proportional to surface roughness,and the range of change was also significantly related to the surface roughness.
STRM is by far the best available global digital terrain data,and its high-precision terrain data is gradually being studied and applied in various fields. In this paper,based on two kinds of terrain data resolution( 90 m,30 m),we used the AERMOD model to predict the Non-point source diffusion to find differences in the prediction of non-point source diffusion resulting from terrain data accuracy.The results showed that after using high-precision terrain data:( 1) the maximum hourly concentration value increased with the changing range of 72%-219% in complex terrain( except scheme 15). This Range of change was significantly related to the surface roughness in flat terrain.( 2) The maximum standard distance was inversely proportional to surface roughness,and the range of change was also significantly related to the surface roughness.
引文
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[3]刘明,孙文杰,尹勤,等.不同精度地形数据对环境安全间距确定的探讨[J].甘肃科技纵横,2016,45(10):4-7.
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[2]周阳,李志强,黄浩云.AERMOD地表参数设置对最大落地浓度影响分析[C]//中国环境科学学会2011年学术年会论文集.2011:1143-1146.
[3]刘明,孙文杰,尹勤,等.不同精度地形数据对环境安全间距确定的探讨[J].甘肃科技纵横,2016,45(10):4-7.
[4]王晓燕,林青慧.DEM分辨率及子流域划分对Ann AGNPS模型模拟的影响[J].中国环境科学,2011(S1):46-52.
[5]刘学军,龚健雅,周启鸣,等.DEM结构特征对坡度坡向的影响分析[J].地理与地理信息科学,2004,20(6):1-6.
[6]张文彤.SPSS统计分析基础教程[M].北京:高等教育出版社,2011.
[7]环境保护部.环境空气质量标准:GB 3095—2012[S].北京:中国环境科学出版社,2012.