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冰川冻土  2014 

青藏公路低温多年冻土温度的多时间尺度分析

DOI: 10.7522/j.issn.1000-0240.2014.0167, PP. 1403-1411

Keywords: 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

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Abstract:

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15a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.

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