【摘要】 在数字地形模型(DTM)的基础上,利用地理信息系统软件ArcGIS确定阴影、提供的地图代数语言功能,模拟了甘肃定西安家沟小流域任意时段内天文辐射的空间分布。该模型借助于ArcGIS的地形分析功能,解决了常规方法不能解决的地形遮蔽对天文辐射的影响。该模型是一个物理模型,对天文辐射能的时空分布可做出较精确描述,提供在常规条件下的重要参数。时空分布分析表明:地形对天文辐射的影响很大,尤其是坡向的影响;天文辐射随着季节变化很大,从3月底开始直到6月上旬一直处于上升阶段,然后下降;地形对天文辐射的影响程度随着季节不同有所不同,但是没有表现出明显的规律。更多还原

【Abstract】 As the most important energysource,the astronomical solar radiation(ASR)is the main force to driveatmosphere movement and it influences the heat condition of the earth-atmosphere system.The main problem that researchers met withsolar radiation calculating in small drainage basin is the influence of slope,slope direction and the shadow to the spatial distribution of ASR.This paper introduces an application in effecing the effect of shadow determined ArcGIS on different slopes and slope direction lands and gets good result.The correlative analysis shows that slope direction is a key factor influencing the solar radiation receiving.Because it is not only a factor participating the solar radiation calculating,but also a factor indirectly though shading influencing receiving the solar radiation;the ASR changes with seasons and the degree of terrain factors influencing the distribution of ASR changes also with seasons,but has no obvious rule.更多还原