首页|Degradation of warm permafrost and talik formation on the Qinghai-Tibet Plateau in 2006-2021
Degradation of warm permafrost and talik formation on the Qinghai-Tibet Plateau in 2006-2021
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国家科技期刊平台
NETL
NSTL
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Permafrost is degrading globally,particularly those with low thermal stability on the Qinghai-Tibet Plateau,owing to climate change.However,the inadequacy of direct research on permafrost degradation based on in-situ monitoring limits the prediction of permafrost degra-dation and engineering practices.This study explored the processes and modes of permafrost degradation into talik by analyzing ground temperature data from five points in the hinterland of the Qinghai-Tibet Plateau from 2006 to 2021.The results showed that the degradation of the warm permafrost layer with a geothermal gradient of zero occurred simultaneously in the top and bottom directions.The rate of permafrost degradation from the top down and bottom up increase during the degradation process,but the increase of the former is more drastic after the formation of thawed interlayer.Additionally,the construction of the Qinghai-Tibet Railway changed the degradation modes of the permafrost in adjacent natural sites through horizontal heat transfer,particularly after through talik formation under the embankment.The findings suggest that taking countermeasures before or immediately after forming thawed interlayer is more effective.When evaluating the thermal impact of projects in warm permafrost regions,special attention should be given to the horizontal heat transfer process that may result from the formation of a through talik.
Beiluhe Observation and Research Station of Frozen Soil Engineering and Environment,Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environmental and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
China Railway Qinghai-Tibet Group Co.Ltd,Xining 810007,China
University of Chinese Academy of Sciences,Beijing 100049,China
国家科技期刊平台
NSTL
万方数据
