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Thermal state of ice-rich soils on the Tommot-Yakutsk Railroad right-of-way

Research in Cold and Arid Regions 2014年第4期6卷 356-360页

作者： pavel skryabin Melnikov Permafrost Institute Siberian Branch of the Russian Academy of SciencesYakutsk 677010 Russia

This paper summarizes the results of investigations carried out in the northern section of the Tommot-Yakutsk Railroad in eastern Siberia, underlain by ice-rich permafrost. The ongoing permafrost and geotechnical research program in support of railroad construction includes assessment of the ground thermal state on the right-of-way and adjacent areas based on long-term field observations using the method of terrain thermal physics. These studies focus on the upper permafrost within the depth of annual temperature variation. In undisturbed areas, inter-annual variability of the ground thermal state shows little response to recent climatic variations. However, forest clearing and surface disturbance during right-of-way construction cause an increase in permafrost temperature, deepening of the active layer, thaw settlement, and water accumulation along the embankment. The active layer is thickest along the sun-exposed left berm and is thinnest along the more shaded right berm. Measures to prevent thaw-related embankment problems are recommended.

关键词： railroad right-of-way temperature thaw depth dynamics permafrost

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Current climate change effects on the ground thermal regime in Central Yakutia

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Research in Cold and Arid Regions 2014年第4期6卷 282-292页

作者： Stepan Varlamov Yuri Skachkov pavel skryabin Melnikov Permafrost Institute Siberian Branch of the Russian Academy of Sciences

The evolution of ground thermal state has been studied to assess impacts of current climatic warming on permafrost in Central Yakutia. The analysis of long-term data of regional weather stations has revealed one of the highest increasing trends in mean annual air temperature in northern Russia. A forecast of surface air temperature fluctuations has been made by applying a frequency analysis method. Monitoring of ground thermal conditions allows us to identify inter-annual and long-term variability among a wide range of natural conditions. Experimental research has indicated a long-term dynamics of ground thermal state evolution： ground temperatures at the depth of zero annual amplitude and seasonally thawed layer depth. Long-term variability of thaw depth shows near-zero to weak positive trends in small valleys in contrast to weak negative trends on slopes. With significant climatic warming, the thermal state of near-surface layers of permafrost demonstrates steadiness. Anthropogenic impacts on ground thermal regime in various terrain types have been qualitatively evaluated. Clear-cutting, ground cover stripping, and post-fire deforestation in inter-alas type terrains result in a significant increase of temperature and seasonal ground thaw depth, as well as adverse cryogenic processes. The dynamics of mean annual ground temperature in slash and burn sites have been evaluated in reference to stages of successive vegetation recovery.

关键词： permafrost active layer climate ground temperature regime natural landscapes disturbed landscapes

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维普期刊数据库

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当前气候变化下的雅库特中部地区土壤温度状况预测(英文)

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黑龙江大学工程学报 2014年第3期5卷 8-12页

作者： Peter Permyakov Stepan Varlamov pavel skryabin Yara Ckachkov 俄罗斯科学院西伯利亚分院北极自然技术研究所俄罗斯科学院西伯利亚分院麦尔尼科夫冻土研究所

预测土壤温度采用通用的年平均气象数据中的空气温度和积雪深度。为改善冻土的预测可靠性,将每月的气象数据考虑在计算方法中。

关键词：冻土数学模型数值计算结果现场实测对比

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