宁夏起伏地形下太阳总辐射分布式模拟

Simulation of the Total Solar Radiation Distribution over Rugged Terrains in Ningxia

在分布式模型中引入遥感数据的同时,综合考虑坡度、坡向和地形相互遮蔽作用对起伏地形下天文辐射的影响,从而基于数字高程模型(DEM)数据,实现了宁夏以起伏地形下天文辐射为起始数据的太阳总辐射分布式模拟。利用1960～2000年数据拟合总辐射各量不同模式的结果,最终选用区域分月模型,结合宁夏2001年遥感数据集成日照百分率资料,计算100 m×100 m分辨率下太阳直接辐射、散射辐射、反射辐射和总辐射,并分析其时空分布特征。计算结果显示:宁夏地区地表形态差异导致的总辐射分布状况整体变化规律为:夏季>春季>秋季>冬季;从坡向上看,向阳山坡太阳总辐射量明显高于背阴坡;从坡度上看,坡度越大太阳总辐射受坡向影响越显著。

The remote sensing data were introduced into the distributed model and at the same time,the influence of the slope,direction of the slope and effect of terrain covering each other on total solar radiation in Ningxia were considered synthetically,and based on digital elevation model（DEM） data,and the astronomical radiation over rugged terrain in Ningxia as the primary data,the total radiation distributed simulation was carried on in this paper.According to the fitting results of several models to different component of solar radiation using the data from 1960 to 2000 in Ningxia,the regional optimization model was finally choosed to calculate the direct radiation,scattering radiation,reflection radiation and total radiation with the resolution of 100 m ×100 m combining with the remote sensing data integration of 2001 sunshine percentage data in Ningxia,and its temporal and spatial distributions were analyzed.The results show that the difference of surface configuration in Ningxia led to total radiation distribution in Ningxia was： summer springautumnwinter,and the total radiation of sunny slope was obvious higher than that in nightside,and when the slope was steeper,the influence of slope direction on total radiation was more significant.