Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments
Mechanical control of drifting sand used to protect the Qinghai–Tibet Railway from sand damage inevitably results in sand deposition, and the change in radiation and heat flux after the ground surface is covered with sandy sediments remains unclear. These variations were studied in this work through...
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ftdoajarticles:oai:doaj.org/article:aabe826703fa40daac3c1e645767c1c5 2023-05-15T17:58:04+02:00 Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments Shengbo Xie Jianjun Qu Yanhu Mu Xiangtian Xu 2017-01-01T00:00:00Z https://doi.org/10.1016/j.rinp.2017.05.005 https://doaj.org/article/aabe826703fa40daac3c1e645767c1c5 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2211379717302449 https://doaj.org/toc/2211-3797 2211-3797 doi:10.1016/j.rinp.2017.05.005 https://doaj.org/article/aabe826703fa40daac3c1e645767c1c5 Results in Physics, Vol 7, Iss , Pp 1712-1721 (2017) Physics QC1-999 article 2017 ftdoajarticles https://doi.org/10.1016/j.rinp.2017.05.005 2022-12-31T11:33:11Z Mechanical control of drifting sand used to protect the Qinghai–Tibet Railway from sand damage inevitably results in sand deposition, and the change in radiation and heat flux after the ground surface is covered with sandy sediments remains unclear. These variations were studied in this work through field observations along with laboratory analyses and tests. After the ground surface was covered with sandy sediments produced by the mechanical control of sand in the Qinghai–Tibet Railway, the reflectivity increased, and the annual average reflectivity on the surface covered with sandy sediments was higher than that without sandy sediments, with the value increasing by 0.043. Moreover, the surface shortwave radiation increased, whereas the surface net radiation decreased. The annual average value of the surface shortwave radiant flux density on the sandy sediments was higher than that without sandy sediments, with the value increasing by 7.291 W·m−2. The annual average value of the surface net radiant flux density on the sandy sediments decreased by 9.639 W·m−2 compared with that without sandy sediments. The soil heat flux also decreased, and the annual average value of the heat flux in the sandy sediments decreased by 0.375 W·m−2 compared with that without sandy sediments. These variations caused the heat source on the surface of sandy sediments underground to decrease, which is beneficial for preventing permafrost from degradation in the section of sand control of the railway. Keywords: Mechanical control of sand, Sand depositions, Surface radiation, Heat flux, Qinghai–Tibet Railway Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Results in Physics 7 1712 1721 |
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topic |
Physics QC1-999 |
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Physics QC1-999 Shengbo Xie Jianjun Qu Yanhu Mu Xiangtian Xu Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments |
topic_facet |
Physics QC1-999 |
description |
Mechanical control of drifting sand used to protect the Qinghai–Tibet Railway from sand damage inevitably results in sand deposition, and the change in radiation and heat flux after the ground surface is covered with sandy sediments remains unclear. These variations were studied in this work through field observations along with laboratory analyses and tests. After the ground surface was covered with sandy sediments produced by the mechanical control of sand in the Qinghai–Tibet Railway, the reflectivity increased, and the annual average reflectivity on the surface covered with sandy sediments was higher than that without sandy sediments, with the value increasing by 0.043. Moreover, the surface shortwave radiation increased, whereas the surface net radiation decreased. The annual average value of the surface shortwave radiant flux density on the sandy sediments was higher than that without sandy sediments, with the value increasing by 7.291 W·m−2. The annual average value of the surface net radiant flux density on the sandy sediments decreased by 9.639 W·m−2 compared with that without sandy sediments. The soil heat flux also decreased, and the annual average value of the heat flux in the sandy sediments decreased by 0.375 W·m−2 compared with that without sandy sediments. These variations caused the heat source on the surface of sandy sediments underground to decrease, which is beneficial for preventing permafrost from degradation in the section of sand control of the railway. Keywords: Mechanical control of sand, Sand depositions, Surface radiation, Heat flux, Qinghai–Tibet Railway |
format |
Article in Journal/Newspaper |
author |
Shengbo Xie Jianjun Qu Yanhu Mu Xiangtian Xu |
author_facet |
Shengbo Xie Jianjun Qu Yanhu Mu Xiangtian Xu |
author_sort |
Shengbo Xie |
title |
Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments |
title_short |
Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments |
title_full |
Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments |
title_fullStr |
Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments |
title_full_unstemmed |
Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments |
title_sort |
variation and significance of surface heat after the mechanical sand control of qinghai–tibet railway was covered with sandy sediments |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://doi.org/10.1016/j.rinp.2017.05.005 https://doaj.org/article/aabe826703fa40daac3c1e645767c1c5 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Results in Physics, Vol 7, Iss , Pp 1712-1721 (2017) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2211379717302449 https://doaj.org/toc/2211-3797 2211-3797 doi:10.1016/j.rinp.2017.05.005 https://doaj.org/article/aabe826703fa40daac3c1e645767c1c5 |
op_doi |
https://doi.org/10.1016/j.rinp.2017.05.005 |
container_title |
Results in Physics |
container_volume |
7 |
container_start_page |
1712 |
op_container_end_page |
1721 |
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1766166605487669248 |