丘陵山区地面辐射场的数值模拟

NUMERICAL SIMULATION OF THE SURFACE RADIATION FIELD IN A HILLY COUNTRY

本文根据对丘陵山区地形参数(平均坡向、坡度和地形遮蔽角)的数值模拟结果,逐项讨论了起伏地形中地面辐射平衡各分量的数值计算方法,提出了各分量的计算机模式。并利用大别山南段赵公岭山区考察资料对该山区3.0×3.5平方千米内100米×100米网格点进行了计算,绘制出该山区1、7月辐射平衡各分量分布图。结果表明,山区地面辐射场与地形要素场配合较好,显示出后者的决定性作用,其中冬季以坡向的影响为主,夏季则以地形遮蔽影响最重要。本文所提供的模拟方法,原则上适用于任意地形下的辐射场的数值计算,从而为更全面地研究山区气候资源提供基础。

Based on the simulations of the topographic parameters (mean orientation, slope and terrain screen angle) in a hilly area, discussion is made term by term of the way of modelling for the components in the surface radiation balance over a rugged terrain, presenting a computer model for each component. In terms of the experimental data, calculation is performed of the components for each of the mesh grids of 100×100m over 3.0×3.5km^2 in the hilly area of Zhaogongling, southern Dabieshan Mountains and a map is prepared showing the distribution of the components for January and July. Results indicate that the hilly-land surface radiation field well matches the terrain element field, which reveals the decisive function of the latter, with orientation dominant in winter and terrain screen most significant in summer. The simulation technique presented in this paper is in principle applicable to the calculation for the radiation field in any topography, thus providing a means for further exploration of the hilly-land climatic resources.