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冰川冻土 ›› 2014, Vol. 36 ›› Issue (6): 1403-1411.doi: 10.7522/j.issn.1000-0240.2014.0167

• 冰冻圈与全球变化 • 上一篇    下一篇

青藏公路低温多年冻土温度的多时间尺度分析

高思如1,2, 吴青柏1, 张中琼1, 侯彦东1,2   

  1. 1. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2014-06-06 修回日期:2014-09-22 出版日期:2014-12-25 发布日期:2015-01-20
  • 通讯作者: 吴青柏, E-mail: qbwu@lzb.ac.cn E-mail:qbwu@lzb.ac.cn
  • 作者简介:高思如(1984-),女,陕西榆林人,2011年在中国地震局兰州地震研究所获硕士学位,现为在读博士研究生,主要从事冻土环境与工程研究.E-mail:gaosiru@lzb.ac.cn
  • 基金资助:

    国家自然科学基金项目(41330634; 41301071); 中国科学院寒区旱区环境与工程研究所青年人才基金项目资助

Multi-time scale analysis of the permafrost temperatures along the Qinghai-Tibet Highway

GAO Siru1,2, WU Qingbai1, ZHANG Zhongqiong1, HOU Yandong1,2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, 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:2014-06-06 Revised:2014-09-22 Online:2014-12-25 Published:2015-01-20

摘要:

利用小波变换分析方法, 对青藏公路风火山监测场地天然状态下和路基中心下15 a的低温多年冻土温度时间序列进行了多时间尺度分析和趋势预测. 结果表明: 天然地表和路基下部多年冻土温度变化具有多时间尺度特征, 二者多时间尺度周期的时频分布特征存在较大差别. 天然地表具有简单的规律性, 路基中心的规律相对较复杂, 主要体现在冻土上限附近. 天然地表下当前均处于暖期, 深层主要受气候长周期波动控制, 使其在进入冷暖期的时间上滞后于上层; 路基中心下浅层和深层的冷暖期相反, 浅层处于暖期, 深层处于冷期, 其长度随热交换量大小和热量积累的变化也不统一, 给路基的稳定性带来了更大的隐患, 但也为控制、减少和治理冻土路基中的病害提供了新依据.

关键词: 青藏公路, 冻土温度时间序列, 小波变换, 多时间尺度, 趋势分析

Abstract:

By using wavelet transformation, multi-time scale characteristics and changing trend of the temperatures within the original ground and embankment in permafrost region at the Fenghuoshan monitoring site along the Qinghai-Tibet Highway are analyzed and predicted. The results show that permafrost temperatures within the original ground and embankment have multi-time scale characteristics, with different time-frequency distributions of multi-time scale; within the natural ground there is a simple regularity; within the embankment there is relatively complex situation, especially, near the permafrost table. Now permafrost temperatures within the original ground are in warm period, and deep permafrost temperatures enters cold-warm period lag behind that in shallow layers. The cold-warm period of shallow and deep permafrost temperatures is the opposite below the embankment, the length of cold-warm period is also not uniform. This could bring more hidden troubles to the stability of roadbed, but provide a new basis for treatment roadbed disease.

Key words: Qinghai-Tibet Highway, permafrost temperature time series, wavelet transformation, multi-time scale, trend analysis

中图分类号: 

  • P642.14