基于DEM的喀斯特地区可照时间空间分布

Spatial Distribution of Duration of Possible Sunshine Based on DEM in Karst Area

采用基于DEM的起伏地形下可照时间计算模型,以广西巴马县为例,探讨了喀斯特地区可照时间的空间分布特点,分析坡度、坡向等地形因子对可照时间的影响。结果表明,可照时间受地形遮蔽影响较大,日照时间阳坡多、阴坡少,平地多、山地少,并且冬季更为明显。坡度对可照时间的影响表现为坡度越大,可照时间越少,且集中分布于坡度小于35°的地区。该方法可为喀斯特地区提供重要的气候基础数据,对喀斯特地区小气候的研究有重要意义。

Taking Guangxi Bama County for example, using the computational model of possible sunshine based on DEM in rugged terrains, this article discussed the characteristics of spatial distribution of duration of possible sunshine in karst area, and analyzed the inl uence of terrain factors such as slope and aspect etc. to duration of possible sunshine. The results show that terrain masking has a great effect on duration of possible sunshine, and there is more sunshine duration in sunny slope and l at land, less in shade slope and mountain land, and this situation get even more obvious in winter. The ef ect of slope is that the duration of possible sunshine decrease with the increase of slope, and most of sunshine duration gather in the area where the slope less than 35 degree. This method could provide essential data of climate, what makes sense for the analysis of microclimate in karst area.