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热融湖影响下多年冻土退化的数值模拟
Received:July 29, 2011  Revised:October 26, 2011  点此下载全文
Cite This Paper:linzhanju,Niu fujun.2013.Numerous simulation of permafrost degradation under influence of thaw lake on Qinghai-Tibet Plateau[J].Acta Geologica Sinica,87(5):737-746
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Author NameAffiliationE-mail
linzhanju Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences zhanjulin@lzb.ac.cn 
Niu fujun Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点基础研究发展计划(973计划)
中文摘要:热融湖是多年冻土区普遍存在的一种热融现象,热融湖作为热源向湖底及湖岸传递热量,导致多年冻土温度升高,在湖底形成融化夹层,甚至贯穿性融化夹层;在湖岸造成上限下降、下限抬深,加速了湖底、湖岸多年冻土的退化速度。在柱坐标下,运用带相变的数值热传导模型,预测了热融湖影响下湖底、湖岸多年冻土的地温场发展趋势和多年冻土的退化状况。模拟的结果表明,湖底年平均温度越高,对湖底和湖岸多年冻土的热扰动越明显。当湖底年平均温度为4℃、水深2.0m时,在经历1000a后,湖心下部地温增幅为4.7~3.2℃、湖边下部地温增幅为2.2~1.1℃、湖岸下部地温增幅为0.3~0.1℃;当湖底年平均温度等于0℃时,湖心下部一般不会形成融化层;当湖底年平均温度等于1℃时,在500a时湖心下部融化层厚度达到25m,在900a时,多年冻土被融穿。随着湖底年平均温度升高,融穿多年冻土的时间缩短。
中文关键词:青藏高原,热融湖,多年冻土退化,数值模拟
 
Numerous simulation of permafrost degradation under influence of thaw lake on Qinghai-Tibet Plateau
Abstract:Thaw lake is a common landscape in permafrost regions. The presence of a water body thus constitutes a heat source and releases the heat energy to the permafrost beneath and around lake, giving rise to the ground temperature increase. A talik, even penetrated talik maybe occur under the lake-bottom. The decline of permafrost table, elevation of permafrost base on the lakeshore accelerates the rapid permafrost degradation. This study predicted the temperature changes beneath and around lake and the process of permafrost degradation. The results showed that when the water depth is 2 m and 4℃ of mean annual lake-bottom temperature, the increase of ground temperature is about 4.7-3.2℃ beneath the lake-bottom, 2.2-1.1℃ beneath the lake-edge, and 0.3-0.1℃ beneath the lakeshore after 1000a. When the mean annual lake bottom temperature equals to or is less 0℃, a talik is impossible formation under the thaw lake; if the temperature increases to 1℃, a 25 m deep talik forms after 500a and the permafrost will be thawed completely after 900a. Therefore, the time of permafrost disappearance shortens with the increase of mean annual lake-bottom temperature.
keywords:Qinghai-Tibet Plateau, thaw lake, permafrost degradation, numerous simulation
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