坡面散射辐射的分布特征及其计算模式

本文应用安装在经纬仪上的天空辐射表所观测的坡面散射辐射资料,对散射辐射的各向异性问题作了较为详尽的分析。揭示出坡面散射辐射随坡向、坡度变化的基本规律。文中还对前人所提出的计算坡面散射辐射的各种模式进行了检验、评述。最终提出一种通用性较强的坡面散射辐射通量密度的计算模式。其物理意义和计算精度都较国外同类模式优越。

THE DISTRIBUTION AND THE COMPUTING MODEL OF THE DIFFUSE RADIATION ON SLOPES

Measurements of diffuse radiation fluxes at different slanting and azimuth angles have been made under various sky conditions by means of a pyranometer combined with a modified old-fashioned theodolite at Nanjing and in the Dabie Mountains in January, April and July. The data obtained are used to investigate the dependence of diffuse radiation on different slopes and azimuthes and evident anisotropy of its distribution is found. Besides, an attempt has been made to evaluate some of the models available for estimating slope diffuse radiation. A model developed on this basis is presented for this purpose. The comparison shows that the results given by this model are considerable better than those by the others. The accurary reached by this modelling approach is found sufficient for a wide range of applications.