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DOI	10.1016/j.coldregions.2018.10.012
	Experimental and theoretical studies on the solar reflectance of crushed-rock layers
	Zhang, Mingyi; Wu, Zhiqiang; Wang, Jiwei; Lai, Yuanming; You, Zhilang
发表日期	2019
ISSN	0165-232X
EISSN	1872-7441
起始页码	13
结束页码	19
卷号	159
英文摘要	Crushed-rock layers have been widely used to cool subgrades in permafrost regions. The convective cooling effect of crushed-rock layers depends not only on the cavities of the layers but also the outmost skin temperature, which is mainly regulated by the solar absorption. Here we experimentally studied the solar reflectance of crushed-rock layers with mean particle sizes of 0.9 cm, 1.5 cm, 2.2 cm, 3.5 cm, 5.4 cm, 8.4 cm, 11.8 cm, 17.3 cm and 26.4 cm, respectively. The experimental results indicate that the solar reflectance of the crushed-rock layers firstly decreases, and then increases with the mean particle size. It is found that the crushed-rock layer with a mean particle size of 5.4 cm reflects the least sunlight. The theoretical analysis indicates that a crushed rock layer absorbs more sunlight as the cavity ratio increases and as the mean intersection angle of crushed-rock surfaces decreases. Our findings imply that the solar reflectance of a crushed-rock layer can be raised by reducing the surface cavity ratio of the crushed-rock layer and/or flattening the crushed-rock layer surface; however, the surface cavity ratio of the crushed-rock layers and the mean intersection angle of the crushed-rock surfaces are uncertain because the crushed-rocks with different shapes were randomly poured into the wood trays; therefore, it is expected that the trend, the macro-reflectance of the crushed-rock layers changes with mean particle sizes, is validated by further refined experiments.
英文关键词	Crushed-rock layer; Solar reflectance; Mean particle size; Permafrost
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS关键词	PERMAFROST REGIONS ; EMBANKMENT ; ALBEDO
WOS记录号	WOS:000458369700002
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239456
作者单位	[Zhang, Mingyi; Wu, Zhiqiang; Wang, Jiwei; Lai, Yuanming; You, Zhilang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China; [Zhang, Mingyi; Wu, Zhiqiang; Wang, Jiwei; Lai, Yuanming; You, Zhilang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingyi,Wu, Zhiqiang,Wang, Jiwei,et al. Experimental and theoretical studies on the solar reflectance of crushed-rock layers[J],2019,159.
APA	Zhang, Mingyi,Wu, Zhiqiang,Wang, Jiwei,Lai, Yuanming,&You, Zhilang.(2019).Experimental and theoretical studies on the solar reflectance of crushed-rock layers.COLD REGIONS SCIENCE AND TECHNOLOGY,159.
MLA	Zhang, Mingyi,et al."Experimental and theoretical studies on the solar reflectance of crushed-rock layers".COLD REGIONS SCIENCE AND TECHNOLOGY 159(2019).