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DOI	10.1007/s12665-015-4313-y
	Period analysis and trend forecast for soil temperature in the Qinghai-Xizang Highway by wavelet transformation
	Gao, Siru; Wu, Qingbai
发表日期	2015
ISSN	1866-6280
EISSN	1866-6299
起始页码	2883
结束页码	2891
卷号	74 期号:4
英文摘要	Soil temperature is a key factor in engineering design, construction and operation involved in permafrost engineering, and is closely associated with engineering stability. Here, the study shows that the wavelet transformation analysis method provides a better understanding of soil temperature in the time-frequency domain. Semimonthly soil temperature time series for two monitoring sites along the Qinghai-Xizang Highway were analyzed using wavelet analysis from 1996 to 2012. Periodic characteristics and trends in soil temperature were determined. The results show that soil temperatures under natural ground and embankment settings have similar periodic change at both sites. Six periods of 18, 36, 78, 130, 220 and 342 half-months were observed. Cold/warm cycles in soil temperature were qualitatively appraised using Morlet wavelets for soil temperatures at these two sites over a cold period in 2012, as well as for soil temperature below embankment at site no. 5 over a warm period. The changes in soil temperature were quantitatively appraised by decomposing and reconstructing soil temperature using dbN wavelets; soil temperature at both sites showed an increasing trend over the past 17 years, with a rise in soil temperature under the natural ground and the embankment corresponding to 0.022 and 0.072 A degrees C a(-1) in warm permafrost and 0.048 and 0.007 A degrees C a(-1) in cold permafrost.
英文关键词	Qinghai-Xizang Highway; Soil temperature; Wavelet transformation; Period; Trend
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS关键词	TIME-SCALE CHARACTERISTICS ; PERMAFROST CHANGES ; RUNOFF VARIATIONS ; TIBET RAILWAY ; DEGRADATION ; EMBANKMENT ; STABILITY ; REGIONS ; RIVER ; MODEL
WOS记录号	WOS:000358320700008
来源期刊	ENVIRONMENTAL EARTH SCIENCES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/240252
作者单位	[Gao, Siru; Wu, Qingbai] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China; [Gao, Siru] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Wu, Qingbai] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Beiluhe Observ Stn Frozen Soil Environm & Engn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Gao, Siru,Wu, Qingbai. Period analysis and trend forecast for soil temperature in the Qinghai-Xizang Highway by wavelet transformation[J]. 中国科学院西北生态环境资源研究院,2015,74(4).
APA	Gao, Siru,&Wu, Qingbai.(2015).Period analysis and trend forecast for soil temperature in the Qinghai-Xizang Highway by wavelet transformation.ENVIRONMENTAL EARTH SCIENCES,74(4).
MLA	Gao, Siru,et al."Period analysis and trend forecast for soil temperature in the Qinghai-Xizang Highway by wavelet transformation".ENVIRONMENTAL EARTH SCIENCES 74.4(2015).