Study on Astronomical Solar Radiation Distribution over the Yellow River Basin Based on DEM Data
Received date: 2003-06-08
Revised date: 2003-07-10
Online published: 2003-11-25
Supported by
The National Key Basic Research Project of China, No.G19990436-01
Based on a distributed model for calculating astronomical solar radiation (ASR), monthly ASR with a resolution of 1 km×1 km for the rugged topography of the Yellow River Basin is 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) the annual ASR has a progressive decreasing trend from south to north; (2) the order of seasonal ASR is summer>spring>autumn>winter; (3) the geographical and topographical factors have robust effects on the spatial distribution of ASR, particularly in winter where a lower sun elevation angle exists; (4) the ASR magnitude for slopes with a sunny exposure is generally 2 or 3 times that of slopes with a shading exposure in January and the extreme difference of ASR for different terrains is over 10 times; (5) the spatial differences of ASR are relatively small in summer where a higher sun elevation angle exists and the extreme difference of ASR for different terrains is only 16% in July; and (6) the sequence of influence strength for topography is winter>autumn>spring>summer.
Key words： astronomical solar radiation; rugged terrains; spatial distributions; DEM
ZENG Yan, QIU Xinfa, LIU Changming, Wu Xianfeng . Study on Astronomical Solar Radiation Distribution over the Yellow River Basin Based on DEM Data[J]. Acta Geographica Sinica, 2003 , 58(6) : 810 -816 . DOI: 10.11821/xb200306002
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