气候变化领域集成服务门户(CCPortal): Long-Term Thermal Regimes of Subgrade under a Drainage Channel in High-Altitudinal Permafrost Environment

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DOI	10.1155/2021/6613114
	Long-Term Thermal Regimes of Subgrade under a Drainage Channel in High-Altitudinal Permafrost Environment
	Yu, Hong; Han, Hongwu; Ma, Wei; Ding, Zekun; Chen, Ling
通讯作者	Ma, W (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China. ; Ma, W (通讯作者)，Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
发表日期	2021
ISSN	1687-8434
EISSN	1687-8442
卷号	2021
英文摘要	In permafrost regions, construction of a channel involves a large amount of excavation activities and changes to surface water body, which can exert great impacts on the thermal regimes of permafrost underlying. In this paper, a coupled mathematical model of heat and moisture transfer was constructed for freeze-thaw soils to investigate the long-term thermal regimes of subgrade beneath a drainage channel built on the Qinghai-Tibet Plateau. Based on the numerical simulations, the thermal regimes of the subgrade both in warm and cold seasons were analyzed within a period of 50 years, as well as the impact of the widths of the channel. The results showed that the channel excavation and flowing water within could lead to a significant underlying permafrost degradation. During the first 30 years, the permafrost beneath the channel mainly experienced a rapid downward degradation. After that, the lateral thermal erosion of the flowing water led to a rapid permafrost degradation beneath the slope of the channel. In cold seasons, the shallow ground beneath the channel would not refreeze due to the flowing water and the thaw bulb actually expanded throughout the year. For the channel with a bottom width of 15 m, the thaw bulb beneath the channel could expand laterally to the natural ground about 10 m far away from the slope shoulder of channel till the 50th year. With different widths, the long-term thermal regimes of the subgrade beneath the channels differed considerably and the maximum difference was at the slope toe of the embankment. With the numerical simulated results, it is recommended that a channel built on permafrost should be wide-and-shallow rather than narrow-and-deep if conditions permit.
语种	英语
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000621841200003
来源期刊	ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254169
作者单位	[Yu, Hong] Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Peoples R China; [Yu, Hong; Ma, Wei; Ding, Zekun; Chen, Ling] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Yu, Hong; Ma, Wei; Ding, Zekun; Chen, Ling] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Han, Hongwu] Qinghai Water Resources & Hydropower Engn Bur Co, Xining 810001, Peoples R China
推荐引用方式 GB/T 7714	Yu, Hong,Han, Hongwu,Ma, Wei,et al. Long-Term Thermal Regimes of Subgrade under a Drainage Channel in High-Altitudinal Permafrost Environment[J]. 中国科学院西北生态环境资源研究院,2021,2021.
APA	Yu, Hong,Han, Hongwu,Ma, Wei,Ding, Zekun,&Chen, Ling.(2021).Long-Term Thermal Regimes of Subgrade under a Drainage Channel in High-Altitudinal Permafrost Environment.ADVANCES IN MATERIALS SCIENCE AND ENGINEERING,2021.
MLA	Yu, Hong,et al."Long-Term Thermal Regimes of Subgrade under a Drainage Channel in High-Altitudinal Permafrost Environment".ADVANCES IN MATERIALS SCIENCE AND ENGINEERING 2021(2021).