摘要
基于重庆市100m×100m分辨率的数字高程模型,利用Solar Analyst模型对各月份地理可照时数进行了模拟,并通过空间叠加运算进一步求得了季、年地理可照时数。季节和月地理可照时数变化表明重庆市夏季地理可照时数最长,以6月最高;冬季地理可照时数最小,以12月最低,地形遮蔽对可照时数的影响显著,可明显影响可照时数的局地空间分布。结合坡度、坡向因子,对起伏地形条件下地理可照时数模拟结果进行了时空分布特征分析。分析结果表明:同坡度不同坡向的地理可照时数都随着太阳高度角的增大而增加;同坡向的地理可照时数随着坡度的增加而减小;坡度越高地理可照时数受坡向影响程度越大。
Based on DEM data with 100 m resolution, average monthly possible sunshine duration is simulated using Solar Analyst model in Chongqing City. Then seasonal and annual possible sunshine durations are ob- tained by calculating spatial data. Results showed that possible sunshine duration is higher in summer and lower in winter. Therefore, it is the highest in June and the lowest in January. And we can see that the effect of terrain on possible sunshine duration is obvious in winter, the solar altitude angle is low at that time. Combined with topographic factors such as slope, aspect derived from DEM, spatial distribution characteris- tics of possible sunshine duration are analyzed. Result suggests that possible sunshine duration in the same slope increases with solar altitude angle, while possible sunshine duration in the same aspect increases with the slope decreases. The higher effect of aspect on possible sunshine duration is in the higher slope.
出处
《水土保持研究》
CSCD
北大核心
2013年第5期287-290,共4页
Research of Soil and Water Conservation
基金
重庆市气象局开放基金(Kfjj-201103)
重庆市博士后特别资助基金(渝xm201102001)
资源环境与生态建设重庆市高校创新团队基金
