基于DEM的新疆区域可照时间的分布式模拟

以新疆区域500 m×500 m分辨率的数字高程模型(DEM)数据为主要数据源,在提取纬度、坡度、坡向等地形要素栅格数据的基础上,使用考虑地形遮蔽的分布式计算模型,完成了新疆区域全年每日可照时间的数值模拟计算,分析了其时空变化特征,讨论了地形因子对可照时间的影响,结果表明:对新疆而言,可照时间7月最长,为441 h;12月最短,为266 h,区域内可照时间的离散度较大,主要原因是地形差异所致;海拔高于1500 m的山区对全区可照时间标准差的贡献率达到了80.1%;冬夏两季有较为显著的纬向分布特征,三大山脉地区可照时间与同纬度平地相比差异明显,表现出可照时间的地域性分布特征;地形对可照时间的影响比较明显,坡度越大可照时间越少;坡向对可照时间的影响主要表现在冬季,大致为可照时间南坡多、北坡少;随着地形开阔度的增大,可照时间有较为明显的增加。

Simulated spatial distribution of sunshine hours based on DEM in Xinjiang

A sunshine hours distribution model was applied to this study that raster data of latitude, slope and slope direction based on digital elevation model resolution 500 m by 500m in Xinjiang area. Discusses the influence of terrain factors on sunshine hours and analyzed the temporal variation characteristics. The results show that: For Xinjiang, sunshine time most in July (441h) and least in December(266h), The reason for the large mean square deviation is the regional contribution rate of 1500m above sea level reached 80.1%; FromStheSspatialSdistributionSof Year-round sunshine time, the north areas was more than the south. The two seasons of winter and summer is obvious zonal distribution, the sunshine time has significantly difference form mountains and ground that with the same latitude; Terrain slope on the performance of the sunshine time is, the greater the received less sunshine time; Influence on the slope to the sunshine time during the winter, the southern slope than the north slope of accept more sunshine. The terrain opening extent and sunshine hours showed a positive correlation increase