起伏地形下黄河流域太阳散射辐射分布式模拟研究

针对天文、大气、宏观地理与局地地形等因子对起伏地形下太阳散射辐射的复杂作用，将影响起伏地形下太阳散射辐射的天空因素与地面因素分开处理.通过基于数字高程模型（DEM）数据的起伏地形下天文辐射模型和地形开阔度模型，综合考虑地面因素对散射辐射的影响；基于常规地面气象站观测资料建立的水平面散射辐射模型考虑天空因素对散射辐射的影响；依据各向异性散射机理，建立了起伏地形下太阳散射辐射分布式计算模型，探索出一条利用DEM数据和常规气象观测资料实现山区太阳散射辐射定量模拟的技术路线.以1 km×1 km分辨率的DEM数据作为地形的综合反映，实现了起伏地形下黄河流域1 km×1 km分辨率的太阳散射辐射分布式模拟.

Distributed modeling of diffuse solar radiation over rugged terrain of the Yellow River Basin

In view of the compositive action of astronomy, atmosphere, macrogeography and local topography factors on the diffuse solar radiation, influences of sky factors and ground factors are separated. Using the extraterrestrial solar radiation model and the terrain openness model, found on DEM data, influences of ground factors on the diffuse solar radiation are considered. Using the horizontal diffuse solar radiation model, simulated by routine meteorological observation data, influences of sky factors on the diffuse solar radiation are considered. Based on anisotropy scattering mechanism, a distributed model for calculating diffuse solar radiation over rugged terrains is developed, which furnishes a new line of thoughts to diffuse solar radiation simulation over rugged terrain, with DEM data and routine meteorological observations as input. Using DEM data with resolution of 1 km×1 km as the general characterization of terrain, distributed modeling of diffuse solar radiation over the Yellow River Basin was achieved.