Acta Geographica Sinica ›› 2003, Vol. 58 ›› Issue (6): 810-816.doi: 10.11821/xb200306002

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Study on Astronomical Solar Radiation Distribution over the Yellow River Basin Based on DEM Data

ZENG Yan1, QIU Xinfa2, LIU Changming1, Wu Xianfeng3   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Department of Geography, Nanjing Institute of Meteorology, Nanjing 210044, China;
    3. Institute of Environmental Science, Beijing Normal University, Beijing 100875, China
  • Received:2003-06-08 Revised:2003-07-10 Online:2003-11-25 Published:2003-11-25
  • Supported by:

    The National Key Basic Research Project of China, No.G19990436-01

Abstract:

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