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冰川冻土 ›› 2015, Vol. 37 ›› Issue (1): 156-161.doi: 10.7522/j.issn.1000-0240.2015.0017

• 寒区科学与技术 • 上一篇    下一篇

风沙堆积对多年冻土温度影响的室内试验研究

贺志霖1,2, 俎瑞平1, 张克存1, 屈建军1, 宗玉梅1,2   

  1. 1. 中国科学院 寒区旱区环境与工程研究所 沙漠与沙漠化重点实验室 敦煌戈壁荒漠生态与环境研究站, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2014-07-26 修回日期:2014-12-09 出版日期:2015-02-25 发布日期:2015-03-23
  • 通讯作者: 俎瑞平,E-mail:zurp@lzb.ac.cn. E-mail:zurp@lzb.ac.cn
  • 作者简介:贺志霖(1989-),男,江西永新人,2012年毕业于江西师范大学,现为中国科学院寒区旱区环境与工程研究所在读硕士研究生,主要从事地表风沙过程研究.E-mail:hezhilin@lzb.ac.cn
  • 基金资助:

    国家自然科学基金项目(41271216); 国家重点基础研究发展计划(973计划)项目(2012CB026105)资助

Laboratory experiment of the influence of aeolian sand accumulation on permafrost temperature

HE Zhilin1,2, ZU Ruiping1, ZHANG Kecun1, QU Jianjun1, ZONG Yumei1,2   

  1. 1. Dunhuang Gobi and Desert Ecological and Environmental Research Station, Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-07-26 Revised:2014-12-09 Online:2015-02-25 Published:2015-03-23

摘要:

随着我国高寒区沙漠化问题的日益严重, 由此产生的地表风沙堆积对多年冻土影响的范围和强度越来越大, 但目前风沙堆积对多年冻土温度的影响过程及机理仍不明确, 特别是缺少室内模型试验方面的研究. 通过室内试验模拟了不同厚度的积沙对多年冻土温度的影响. 结果表明:除试验箱气温为正负温过渡阶段外, 当试验箱气温为负温时期, 积沙冻土的中上层温度比无积沙冻土高, 且沙层越厚温度越高, 但均为负温, 整个土层仍对应冻结状态; 当试验箱气温为正温时期, 积沙冻土的中上层温度比无积沙冻土低, 且沙层越厚温度越低, 而正温阶段对应冻土融化时期, 积沙的降温作用可延缓冻土的融化. 在3个冻融循环周期内, 积沙冻土的底面平均温度均比无积沙冻土低, 且沙层越厚, 冻土底面温度波幅越小.

关键词: 风沙堆积, 多年冻土, 青藏高原, 模型试验

Abstract:

With the increasing of sandy desertification in alpine regions of China, the scope and intensity of the influence of aeolian sand accumulation on permafrost grows bigger and bigger. However, this situation is not clear so far, especially lack of laboratory experimental study. In this paper, the influence of aeolian sand accumulation with different thickness on permafrost temperature is researched through laboratory experiment. The results show that except for the air temperature transition periods, While the air temperature is negative, the frozen soil temperatures at upper-middle layer covered by sand are higher than that without sand cover. The thicker the sand layer is, the higher the frozen soil temperature is. When all of the frozen soil temperatures are negative, the soil is always in frozen state during this period. When the air temperature is positive, the frozen soil temperatures at upper-middle layer covered with sand layer are lower than that without sand cover. The thicker the sand layer is, the lower the frozen soil temperature is. While warm season is the thawing period for frozen soil, so the cooling effect of sand layer could delay the thawing process in this phase. The mean temperature at the bottom of frozen soil covered with sand layer is lower than that without sand cover during the whole three cycles. The thicker the sand layer is, the smaller the temperature amplitude at the bottom of frozen soil is.

Key words: aeolian sand accumulation, permafrost, Tibetan Plateau, model experiment

中图分类号: 

  • P642.14