基于DEM的栖霞山区日照时数模拟研究

针对栖霞市地形变异对太阳辐射在地面分布的影响,利用数字高程模型为基本信息源,在提取数字坡度模型和数字坡向模型的基础上,采用多层面复合分析的方法,通过对地形要素与其他气候要素的复合分析,建立了区域地面的太阳辐射模型。模拟计算过程中,每一个栅格单元瞬时太阳辐射能量的计算是其中最基础的工作,通过对瞬时太阳辐射量的时段累计,可获得日、月、年的太阳辐射总量。该结果可望进一步转换成对农作物生长有重要影响的积温、无霜期等重要的小气候指标,为精细农业的实施提供了重要的数据资源。

Research on Sunlight Hours Simulation in Qixia Based on DEM

Based on the effect of terrain variation on solar radiation distribution in the ground of Qixia,the regional ground solar radiation model was built using digital elevation model（DEM） as the basic information source though mufti-layer composite analysis of terrain elements and other climate factors with the foundation of the extraction of digital slope model and the digital aspect model.In this paper,the solar radiation grid was calculated by grid and the total solar radiation of date,month or year could be calculated by the accumulated solar radiation of grid.This result was expected to be applied in the calculation of the accumulated temperature,frostless period and other important microclimate factors for crops growth and provide important data resource to the implementation of precision agriculture.