基于DEM的黄河流域天文辐射空间分布
Based on the developed distributed model for calculating astronomical solar radiation (ASR), monthly ASR with a resolution of 1 km× 1 km for the rugged terrains of Yellow River Basin was calculated, with DEM data as the general characterization of terrain. This model gives an all-sided consideration on factors that influence the ASR. Results suggest that (1) Annual ASR has a progressive decrease trend from south to north; (2) the magnitude order of seasonal ASR is: summer＞spring＞autumn＞winter; (3) topographical factors have robust effect on the spatial distribution of ASR, particularly in winter when a lower sun elevation angle exists; (4) the ASR of slopes with a sunny exposure is generally 2 or 3 times that of slopes with a shading exposure and the extreme difference of ASR for different terrains is over 10 times in January; (5) the spatial differences of ASR are relatively small in summer when a higher sun elevation angle exists and the extremedifference of ASR for different terrains is only 16% in July; and (6) the sequence of topographical influence strength is: winter＞autumn＞spring＞summer.
作 者： 邱新法 曾燕 刘昌明 WU Xianfeng Qiu Xinfa ZENG Yan LIU Changming WU Xianfeng 作者单位： 邱新法,Qiu Xinfa(Dept. of Geography, Nanjing Institute of Meteorology, Nanjing 210044, China)曾燕,刘昌明,ZENG Yan,LIU Changming(Inst. of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China)
WU Xianfeng,WU Xianfeng(Inst. of Environmental Science, Beijing Normal University, Beijing 100875, China)
刊 名： 地理学报(英文版) ISTIC SCI 英文刊名： JOURNAL OF GEOGRAPHICAL SCIENCES 年，卷(期)： 2004 14(1) 分类号： P3 关键词： astronomical solar radiation (ASR) rugged terrains spatial distributions digital elevationmodel (DEM)