基于DEM的山地总辐射模型及实现

Modeling of Global Radiation over Rugged Areas Based on DEM

总辐射状况是决定山地气候的主导性因子。山区地形条件复杂 ,总辐射分布差异显著 ,为了便于研究山区总辐射的地域分布规律 ,该文建立了一种基于DEM模拟山区总辐射的方法 ,通过提取数字坡度模型、数字高度模型以及地形遮蔽度模型等信息 ,并采用多层面复合分析的方法 ,建立了山区直接辐射、散射辐射以及总辐射的数字模型。实验证明 ,太阳总辐射及其分量在山区中有很强的地域分布规律。该方法采用的DEM精度高 ,能够精细地反映太阳辐射的地区分布差异 ,为山地气候资源调查与利用。

Through extracting a series of related topographic parameters,such as slope gradient,aspect,and terrain shading areas,the digital model of direct radiation and diffuse radiation and global radiation is conducted by the means of a GIS based on overlay processing.The experiment shows that the regional distribution of solar radiation could be effectively visualized and quantified.It could be of critical significance for the research of regional microclimate,agricultural programming and the application of solar energy.