| 风沙堆积对多年冻土温度影响的室内试验研究 |
| |
| 引用本文： | 贺志霖,俎瑞平,张克存,屈建军,宗玉梅.风沙堆积对多年冻土温度影响的室内试验研究[J].冰川冻土,2015,37(1):156-161. |
| |
| 作者姓名： | 贺志霖 俎瑞平 张克存 屈建军 宗玉梅 |
| |
| 作者单位： | 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;中国科学院大学,北京100049;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 |
| |
| 基金项目： | 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 |
| |
| 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 |
| 收稿时间： | 2014-07-26 |
Laboratory experiment of the influence of aeolian sand accumulation on permafrost temperature |
| |
| HE Zhilin,ZU Ruiping,ZHANG Kecun,QU Jianjun,ZONG Yumei.Laboratory experiment of the influence of aeolian sand accumulation on permafrost temperature[J].Journal of Glaciology and Geocryology,2015,37(1):156-161. |
| |
| Authors: | HE Zhilin ZU Ruiping ZHANG Kecun QU Jianjun ZONG Yumei |
| |
| Institution: | 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 |
| |
| 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. |
| |
| Keywords: | aeolian sand accumulation permafrost Tibetan Plateau model experiment |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《冰川冻土》浏览原始摘要信息 |
| 点击此处可从《冰川冻土》下载免费的PDF全文 |
|
