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受全球气候变化影响,国内东北高纬度冻土地区多年冻土退化显著,冻土融化过程中水分相态变化对土体的力学指标产生严重影响,导致多条高速公路路域滑坡、路基不均匀沉陷等地质灾害频发。为了研究岛状冻土区域分布规律,以北安至黑河高速公路K153-K183路域为研究区,分别选择覆盖范围2009年3、5、9月3景Landsat 7 ETM+影像数据,运用辐射传输方程法对研究区进行红外地表温度反演,得到研究区对应日期时刻地表温度图,分析了地温与NDVI、DEM的相关性。对反演的结果采用自然间断点分级法进行图层分类,通过对研究区地表温变分析和人工解译,获得对应时刻区域内的低温区分布图,对低温区进行相交运算,得到研究区2009年冻土分布图,经与北安至黑河高速公路冻土勘察结果比对,具有较好的一致性。
Affected by the global climate change, the permafrost degeneration in the high latitudes of Northeast China is significant, and the change of water phase phase has a serious impact on the mechanics index of the soil, resulting in the landslide and roadbed unevenness of many freeways Subsidence and other geological disasters. In order to study the distribution of island-shaped permafrost regions, taking the K153-K183 road network of Bei’an-Heihe Expressway as the study area, Landsat 7 ETM + image data of 3, 5 and 9 months in 2009 were selected respectively. Using radiation transmission equation Law of the study area of infrared surface temperature inversion, the study area corresponding to the time of the surface temperature map, analysis of the ground temperature and NDVI, DEM correlation. The results of the inversion were classified by natural discontinuous point classification method. Through the analysis of surface temperature change and artificial interpretation in the study area, the low temperature distribution map of the corresponding time zone was obtained, and the low temperature zone was intersected to obtain the study area The permafrost distribution map in 2009 is in good agreement with the result of the permafrost survey of Bei’an-Heihe Expressway.