Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau
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 infrastr...
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ftdoajarticles:oai:doaj.org/article:a39276a1302e4c91a0d43b1729d03999 2023-10-01T03:58:53+02:00 Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau Wenjiao Li Zhanju Lin Xingwen Fan Miaomiao Yao Xuyang Wu 2023-09-01T00:00:00Z https://doi.org/10.1016/j.csite.2023.103311 https://doaj.org/article/a39276a1302e4c91a0d43b1729d03999 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2214157X23006172 https://doaj.org/toc/2214-157X 2214-157X doi:10.1016/j.csite.2023.103311 https://doaj.org/article/a39276a1302e4c91a0d43b1729d03999 Case Studies in Thermal Engineering, Vol 49, Iss , Pp 103311- (2023) Different slope orientation Near-surface ground temperature Soil moisture content Net radiation Heat flux Engineering (General). Civil engineering (General) TA1-2040 article 2023 ftdoajarticles https://doi.org/10.1016/j.csite.2023.103311 2023-09-03T00:49:37Z 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 man-made 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 °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. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Case Studies in Thermal Engineering 49 103311 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Different slope orientation Near-surface ground temperature Soil moisture content Net radiation Heat flux Engineering (General). Civil engineering (General) TA1-2040 |
spellingShingle |
Different slope orientation Near-surface ground temperature Soil moisture content Net radiation Heat flux Engineering (General). Civil engineering (General) TA1-2040 Wenjiao Li Zhanju Lin Xingwen Fan Miaomiao Yao Xuyang Wu Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau |
topic_facet |
Different slope orientation Near-surface ground temperature Soil moisture content Net radiation Heat flux Engineering (General). Civil engineering (General) TA1-2040 |
description |
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 man-made 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 °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. |
format |
Article in Journal/Newspaper |
author |
Wenjiao Li Zhanju Lin Xingwen Fan Miaomiao Yao Xuyang Wu |
author_facet |
Wenjiao Li Zhanju Lin Xingwen Fan Miaomiao Yao Xuyang Wu |
author_sort |
Wenjiao Li |
title |
Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau |
title_short |
Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau |
title_full |
Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau |
title_fullStr |
Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau |
title_full_unstemmed |
Experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, Qinghai-Tibet Plateau |
title_sort |
experimental study on the influence of embankment slope direction on near-surface thermal conditions in permafrost region, qinghai-tibet plateau |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.csite.2023.103311 https://doaj.org/article/a39276a1302e4c91a0d43b1729d03999 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Case Studies in Thermal Engineering, Vol 49, Iss , Pp 103311- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2214157X23006172 https://doaj.org/toc/2214-157X 2214-157X doi:10.1016/j.csite.2023.103311 https://doaj.org/article/a39276a1302e4c91a0d43b1729d03999 |
op_doi |
https://doi.org/10.1016/j.csite.2023.103311 |
container_title |
Case Studies in Thermal Engineering |
container_volume |
49 |
container_start_page |
103311 |
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1778532113584226304 |