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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Main Authors:	Shengbo Xie, Jianjun Qu, Yanhu Mu, Xiangtian Xu
Format:	Article
Language:	English
Published:	Elsevier 2017-01-01
Series:	Results in Physics
Online Access:	http://www.sciencedirect.com/science/article/pii/S2211379717302449

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spelling	doaj-aabe826703fa40daac3c1e645767c1c52020-11-25T02:35:50ZengElsevierResults in Physics2211-37972017-01-01717121721Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sedimentsShengbo Xie0Jianjun Qu1Yanhu Mu2Xiangtian Xu3Key Laboratory of Desert and Desertification/State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Corresponding author.Key Laboratory of Desert and Desertification/State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, ChinaKey Laboratory of Desert and Desertification/State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, ChinaInstitute of Transportation, Inner Mongolia University, Hohhot 010070, ChinaMechanical 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 Railwayhttp://www.sciencedirect.com/science/article/pii/S2211379717302449
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Shengbo Xie Jianjun Qu Yanhu Mu Xiangtian Xu
spellingShingle	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 Results in Physics
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
series	Results in Physics
issn	2211-3797
publishDate	2017-01-01
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
url	http://www.sciencedirect.com/science/article/pii/S2211379717302449
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Variation and significance of surface heat after the mechanical sand control of Qinghai–Tibet Railway was covered with sandy sediments

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