气候变化领域集成服务门户(CCPortal): Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau

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DOI	10.1016/j.csite.2023.103311
	Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau
	Li, Wenjiao; Lin, Zhanju; Fan, Xingwen; Yao, Miaomiao; Wu, Xuyang
发表日期	2023
ISSN	2214-157X
卷号	49
英文摘要	Heterogeneous ground thermal conditions caused by slope orientation are significant in Qinghai Tibet Plateau because of the high altitude and strong solar radiation. Variation in solar radiation may result in contrasting thermal and upper boundary conditions, causing engineering problems at infrastructure with sloped embankments. Quantitative research on conditions on different manmade slopes is insufficient in permafrost regions, and consequently, planning for long-term effects on linear infrastructure is challenging. Net radiation, heat flux, near-surface temperature, soil moisture content, were recorded for one whole year (2021) at a field platform with eight slopes. Slope orientation affected net radiation (Rn) and ground heat flux (G), resulting in different energy balances between slopes. The north facing slope had a lowest Rn (174 W m-2), while the south slope had a maximum (239.8 W m-2). The north slope had a negative annual heat flux (-0.7 W m-2), while a maximum positive flux (1.5 W m-2) was recorded on the southeast slope. The annual mean surface temperature (Ts) was highest on the south slope and lowest on the north slope. The maximum difference of ground temperatures (within 30 cm depth) (Tg), was close to differences in Ts of over 4 degrees C. The maximum difference in soil moisture content during the thawing season (May-October) was 11% between the W and E slopes. Due to the different ground temperatures and soil moisture conditions, the annual number of freeze-thaw cycles was variable, and the maximum freeze-thaw cycles were 106 times in south slope and the minimum were 18 times in west slope. Those different thermal conditions between different slope orientations were significant, and pertinent to planning and maintenance of infrastructure. The results provide accurate boundary conditions for modeling to support development of new infrastructure that have embankment slopes in any direction, and for ensuring the stability of existing structures on Qinghai-Tibet Plateau.
关键词	Different slope orientation Near-surface ground temperature Soil moisture content Net radiation Heat flux
英文关键词	VARIABILITY; PERFORMANCE; HIGHWAY
WOS研究方向	Thermodynamics
WOS记录号	WOS:001047107600001
来源期刊	CASE STUDIES IN THERMAL ENGINEERING
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283171
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Li, Wenjiao,Lin, Zhanju,Fan, Xingwen,et al. Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau[J],2023,49.
APA	Li, Wenjiao,Lin, Zhanju,Fan, Xingwen,Yao, Miaomiao,&Wu, Xuyang.(2023).Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau.CASE STUDIES IN THERMAL ENGINEERING,49.
MLA	Li, Wenjiao,et al."Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau".CASE STUDIES IN THERMAL ENGINEERING 49(2023).