Advances in Earth Science ›› 2005, Vol. 20 ›› Issue (3): 275-271. doi: 10.11867/j.issn.1001-8166.2005.03.0275

Special Issue: 青藏高原研究——青藏科考虚拟专刊

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CHEN Ji; CHENG Guodong; NIU Fujun; HU Zeyong   

  1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2004-03-26 Revised:2004-07-20 Online:2005-03-25 Published:2005-03-25

CHEN Ji;CHENG Guodong;NIU Fujun;HU Zeyong. WIND’S COOLING EFFECT ON FROZEN SOIL—FOR EXAMPLE OF QINGHAI-TIBET RAILWAY[J]. Advances in Earth Science, 2005, 20(3): 275-271.

In wide cold regions, especially frozen soil area with frequent wind, thermal exchange mode between Earth's surface and air does not consist of thermal conduction, natural convection and radiation. Under the action of wind, forced convection of air above ground and water evaporation of top soil layer will be greatly enhanced. They will have important effect on the ground temperature regime. Taking example of frozen soil area in Qinghai-Tibet Plateau, annual average air temperature of 1.5m above Earth’s surface is 2.5℃, lower than that of earth’s surface. At the same time, water evaporation brings away a lot of heat stored in moist top soil layer. At first, this paper focused on the concept of wind's cooling effect[WTBZ], which suggests that wind in frozen soil area can lower the temperature of earth surface and accelerate the growth of frozen soil. Many factors that affect wind's cooling effect were also analyzed briefly. Then, through comparison and analysis between the two engineering examples in the Beiluhe testing site of Qinghai-Tibet Railway, it was proved that wind has significant effect on the thermal status. Finally, this paper presented its direct and indirect application to engineering practice in cold regions, its applicability and limitation in the aspect of protecting permafrost. 

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