起伏地形下福建省太阳总辐射的分布式模拟

基于数字高程模型(DEM)数据,综合考虑坡度、坡向、地形遮蔽度等因素,建立了起伏地形下总辐射分布式模型(包括起伏地形下太阳直接辐射、散射辐射和地形反射辐射的分布式模型)。利用1960～2010年数据模拟了福建省旬尺度100 m下的太阳总辐射及其空间分布。结果显示:福建省区域内总辐射平均值绝对误差最大为0. 04 MJ/m~2,平均绝对误差为0. 03 MJ/m~2,平均相对误差为8. 25%,个例年验证平均相对误差为9. 1%;模拟结果表明:福建省总辐射夏季各旬之间变化平缓,实际地形下总辐射受纬度影响没有冬季明显,冬季山地与滨海平原总辐射差异较大;太阳总辐射在局地地形下受坡度坡向影响十分明显,阳坡的辐射量要明显大于阴坡,其中冬季差异最明显;从坡度来看,坡度越大太阳总辐射受坡向的影响越大。

Distributed Modelling of Total Solar Radiation of Rugged Terrain over Fujian Province

Based on the digital elevation model (DEM) data, Comprehensive consideration of factors such as slope, aspect, and terrain obscuration, a distributed model of total radiation under undulating terrain in Fujian Province (including direct solar radiation under undulating terrain, Distributed model of scattered radiation and topographically reflected radiation). Using the data from 1960 to 2010, the spatial distribution of total solar radiation in each ten-day of Fujian Province was simulated and analyzed, and the spatial resolution was 100m×100m. The results show that The absolute error of the total radiation average in Fujian Province is 0.04 MJ/m2, The average absolute error is 0.03 MJ/m2 , The average relative error is 8.25%, The average relative error of the annual verification is 9.1%; Simulation results show that The total radiation in Fujian province is flat between each ten-days of summer. The total radiation of actual terrain in summer which affected by latitude is less obvious than that in winter. There is large difference in total radiation between moutain and coastal plains in winter. The local terrain is obviously affected by the slope direction, and the radiation amount of the sunny slope is evidently larger than that of the shady slope. The difference in winter is most manifest. From the slope point of view, the greater the slope, the more obvious the total solar radiation is affected by the aspect.