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Article

Proposal of a New Method for Controlling the Thaw of Permafrost around the China–Russia Crude Oil Pipeline and a Preliminary Study of Its Ventilation Capacity

by 1,2,3, 1,2,3,*, 1,2,3, 1,3, 1,2,3, 4, 4 and 5
1
State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Da Xing’anling Observation and Research Station of Frozen-Ground Engineering and Environment, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Jagdaqi 165000, China
4
College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
5
Da Xing’anling Investigation and Design Institute, National Forestry and Grassland Administration, Jagdaqi 165000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander Shiklomanov
Water 2021, 13(20), 2908; https://doi.org/10.3390/w13202908
Received: 17 August 2021 / Revised: 2 October 2021 / Accepted: 12 October 2021 / Published: 16 October 2021
(This article belongs to the Special Issue Hydrological Impacts of Degrading Permafrost and Changing Climate)
The China–Russia crude oil pipeline (CRCOP) has been in operation for over ten years. Field observation results have shown that a thaw bulb has developed around the CRCOP which expands at a rate of more than 0.8 m∙a−1 in depth. In view of the deficits of existing measures in mitigating permafrost thaw, a new control method is proposed based on active cooling. According to the relationship between total pressure loss and the driving force of natural ventilation, the wind speed in a U-shaped air-ventilation pipe around the CRCOP is calculated. By analyzing the theoretical calculation and numerical analysis results, it is found that the influence of thermal pressure difference on the natural ventilation of the structure can be negligible, and the influences of resistance loss along the pipe and local resistance loss in the pipe are similarly negligible. Exhaust elbows greatly improve the ventilation performance of the U-shaped air-ventilated pipe. This study developed a novel structure around warm-oil pipelines in permafrost for mitigating thaw settlement along the CRCOP and other similar projects across the world. View Full-Text
Keywords: China–Russia crude oil pipeline; permafrost engineering; climate warming; thaw settlement; air-ventilated pipe; convective heat transfer China–Russia crude oil pipeline; permafrost engineering; climate warming; thaw settlement; air-ventilated pipe; convective heat transfer
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MDPI and ACS Style

Cao, Y.; Li, G.; Wu, G.; Chen, D.; Gao, K.; Tang, L.; Jia, H.; Che, F. Proposal of a New Method for Controlling the Thaw of Permafrost around the China–Russia Crude Oil Pipeline and a Preliminary Study of Its Ventilation Capacity. Water 2021, 13, 2908. https://doi.org/10.3390/w13202908

AMA Style

Cao Y, Li G, Wu G, Chen D, Gao K, Tang L, Jia H, Che F. Proposal of a New Method for Controlling the Thaw of Permafrost around the China–Russia Crude Oil Pipeline and a Preliminary Study of Its Ventilation Capacity. Water. 2021; 13(20):2908. https://doi.org/10.3390/w13202908

Chicago/Turabian Style

Cao, Yapeng, Guoyu Li, Gang Wu, Dun Chen, Kai Gao, Liyun Tang, Hailiang Jia, and Fuqiang Che. 2021. "Proposal of a New Method for Controlling the Thaw of Permafrost around the China–Russia Crude Oil Pipeline and a Preliminary Study of Its Ventilation Capacity" Water 13, no. 20: 2908. https://doi.org/10.3390/w13202908

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