地理学报 ›› 2003, Vol. 58 ›› Issue (6): 810-816.doi: 10.11821/xb200306002

• 生态系统与地表过程 • 上一篇    下一篇

基于DEM的黄河流域天文辐射空间分布

曾燕1, 邱新法2, 刘昌明1, 吴险峰3   

  1. 1. 中国科学院地理科学与资源研究所,北京 100101;
    2. 南京气象学院资源环境与城乡规划系,南京210044;
    3. 北京师范大学环境科学研究所,北京 100875
  • 收稿日期:2003-06-08 修回日期:2003-07-10 出版日期:2003-11-25 发布日期:2003-11-25
  • 作者简介:曾燕 (1972-), 女, 吉林人, 讲师, 博士生, 主要研究方向为水文气象学。E-mail: zengy@igsnrr.ac.cn
  • 基金资助:

    国家重点基础研究发展规划项目(G19990436-01)

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

摘要:

基于1 km×1 km分辨率的数字高程模型 (DEM) 数据,利用建立的起伏地形下天文辐射分布式计算模型,计算了黄河流域1 km×1 km分辨率各月天文辐射的空间分布。结果表明:局部地形对黄河流域年和四季天文辐射的空间分布影响明显;在太阳高度角较低的冬季,地理和地形因子对天文辐射的影响相当强烈,山区天文辐射的空间差异大,1月份向阳山坡 (偏南坡) 天文辐射可为背阴山坡 (偏北坡) 的2~3倍,极端天文辐射的差异可达10倍以上;而在太阳高度角较高的夏季,天文辐射空间差异较小,7月份不同地形极端天文辐射的差异仅在16%左右;四季中,地形对天文辐射影响的程度为冬季>秋季>春季>夏季。

关键词: 天文辐射, 起伏地形, 空间分布, 数字高程模型(DEM)

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