起伏地形下潜在辐射资源空间分异研究

Research on Potential Solar Radiation Resource Spatial Variation in Rugged Terrain

基于DEM数据,利用Solar Analyst模型对重庆市起伏地形下晴天太阳辐射进行了模拟。研究表明,夏季晴天太阳辐射量最大,以7月最高;冬季晴天太阳辐射量最小,以1月最低;各月晴天太阳总辐射受起伏地形影响的程度排序是:1月>10月>4月>7月;随着坡度的增加,太阳总辐射受坡向影响的程度呈增强趋势;从坡向上看,向阳坡太阳总辐射量明显高于背阴坡。

Based on DEM, using the Solar Analyst model, monthly, seasonal and annual solar radiations under clear sky were calculated in this paper. The results suggest that the order of seasonal solar radiation under clear sky is summer>spring>autumn>winter, the highest in July, and the lowest in January. Combined with topographic factors such as slope, aspect, the ratio of solar radiation under clear sky under rugged terrains and flat was calculated. The results were used to show the impact of terrains. The results suggest that the global solar radiation to be affected, owing to different months, is followed by January>October>April>July. And the impact of aspect is enhanced owing to increases of slope. The solar radiation under clear sky of southern aspect of mountains is larger than northern aspect.