Abstract
We performed a regional geological survey in discontinuous permafrost (PF) area along the Bei’an to Heihe Expressway between September 2009 and October 2016 to investigate the state and change of PF in northeast China. Underground resistivity changes were periodically detected along the foot of the subgrade and soil temperatures were monitored under the road foundation. We combined local meteorological and average annual air temperature data to analyze changes in PF thickness. The climate data show that the average annual temperature has gradually increased in the study area since 1980, rising to 0 °C around 1990, and the frost number has decreased to less than 0.5 since 1988. The soil temperature results show that the PF temperature in this section is higher than − 1 °C and is in a high-temperature PF zone affected by changes in seasonal air temperature. The PF under the left foot of the subgrade (LPF) and under the road central separation zone of the road (CPF) both show a decreased PF table, increased PF base, and severe PF degradation. Owing to different cover thicknesses, as well as differences in heat transfer between frozen and unfrozen soil, the base of LPF degraded faster than its table, to CPF the opposite is true. Underground resistivity measurements to verify the accuracy of the PF degradation results. The ground temperature monitoring data and climate data show good consistency. Comprehensive analysis results show that PF in the study area is in a strong degradation stage and will soon disappear.
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We thank the reviewers for their many suggestions for this paper.
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This study was financially supported by the National Natural Science Foundation of China (41641024).
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Guo, Y., Shan, W., Zhang, C. et al. Monitoring of permafrost degradation along the Bei’an-Heihe Expressway in China. Bull Eng Geol Environ 80, 1–10 (2021). https://doi.org/10.1007/s10064-020-01919-3
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DOI: https://doi.org/10.1007/s10064-020-01919-3