丘陵山区地面热平衡场数值模拟的初步探讨

本文根据丘陵山区地形参数(平均坡度、坡向及地形遮蔽角)的数值模拟结果,以及在完成山区地面辐射场计算的基础上,从地表能量平衡方程出发,初步建立起零维地表能量平衡模式,并利用考察资料和附近气象站资料,对大别山南段赵公岭山区3.0×3.5km~2范围内100m网格点进行计算,首次绘制出热平衡各分量在该山区的分布图。结果表明,山区地面热平衡场与地形要素配合较好,显示出地形条件的决定性作用。

A PRELIMINARY NUMERICAL STUDY ON THE SURFACE HEAT BALANCE FIELD IN THE HILLY AREA

Starting from the surface energy balance equation based upon the numerical simulations of the topographic parameters (mean orientation,slope and terrain screen angle) and the calculated surface radiation field in the hilly area,a zero-dimensional surface energy balance model is formulated,which is then employed to find the thermal regime through the calculation done on 100m×100 m grids within the 3.0 km×3.5 km domain over the Zhaogongling in the southern part of the Dabieshan Mountains in terms of the measurements obtained during the experiment and from the nearby station,whereupon the distributions of the components of the heat balance are mapped for the region in view.Resuits show that the surface heat balance field is in good coordination with the terrain elements that exhibit decisive effect.