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DOI	10.1016/j.coldregions.2022.103485
	Thermal conductivity contrast effect of organic soils and its environmental implications
	He, Ruixia; Jin, Huijun; Jia, Ning; Wang, Hongbo; Jin, Xiaoying; Li, Xinyu
通讯作者	Jin, HJ (通讯作者)，Northeast Forestry Univ, Sch Civil Engn, Harbin 150040, Peoples R China.
发表日期	2022
ISSN	0165-232X
EISSN	1872-7441
卷号	196
英文摘要	Thermal conduction control is important for retarding permafrost degradation and mitigating of frost geohazards. Similar to a thermodiode, high thermal conductivity contrast (HTCC) materials can serve as good thermal insulators. A preferred HTCC material for ground cooling is larger in thermal resistance in summer and smaller in winter. Because of contrasting thermal conductivity under frozen and thawed states, organic soil is blessed with such a property. This study quantified and reported the HTCC effects on a range of soil organic matter concentrations (SOMC) and soil moisture saturation degree (SMSD). Using the COMSOL, influences of different SOMC and SMSD on ground temperatures were simulated and compared with laboratory-measured properties. Simulation results demonstrated that with constant SMSD at 20% throughout the year, the thermal insulation effect was strengthened with increasing SOMC. A better insulating effect was judged by lower annual amplitudes and smaller depths of zero annual amplitude of ground temperatures. In case of low SMSD in summer (20%) and high SMSD in winter (60-80%), the HTCC effect of soil is enhanced with increasing SOMC. This enhancement was evidenced by increased thermal offsets and decreased maximum summer and average nearsurface soil temperatures. With constant SOMC and increasing SMSD, the rising HTCC effect gradually cools the ground. An integral analysis indicates that the higher the SOMC and SMSD in winter, the larger the thermal offset and the lower the ground temperature, i.e., the greater the HTCC effect of organic soil. This study may provide geocryological bases for engineering and environmental applications in cold regions.
关键词	QINGHAI-TIBET RAILWAY CLIMATE-CHANGE HINGGAN MOUNTAINS NORTHEAST CHINA PERMAFROST EMBANKMENT DEGRADATION INSULATION PLATEAU STATE
英文关键词	Organic soil; Thermal conductivity contrast effect; Numerical simulations; Soil moisture saturation; Thermal offsets; Permafrost
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS记录号	WOS:000749919900005
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
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/254389
作者单位	[He, Ruixia; Jin, Huijun] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soils Engn, Lanzhou 73000, Peoples R China; [He, Ruixia; Jin, Huijun] Chinese Acad Sci, Res Stn Frozen Ground Engn & Environm, Northwest Inst Ecoenvironm & Resources, Lanzhou 73000, Peoples R China; [Jin, Huijun; Jin, Xiaoying] Northeast Forestry Univ, Sch Civil Engn, Inst Cold Reg Sci & Engn, Harbin 150040, Peoples R China; [Jin, Huijun; Jin, Xiaoying] Northeast Forestry Univ, Northeast China Observ & Res Stn Permafrost Geoen, Minist Educ, Harbin 150040, Peoples R China; [Jin, Huijun; Jia, Ning; Li, Xinyu] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China; [Wang, Hongbo] Tianshui Normal Univ, Sch Civil Engn, Tianshui 741001, Gansu, Peoples R China
推荐引用方式 GB/T 7714	He, Ruixia,Jin, Huijun,Jia, Ning,et al. Thermal conductivity contrast effect of organic soils and its environmental implications[J]. 中国科学院西北生态环境资源研究院,2022,196.
APA	He, Ruixia,Jin, Huijun,Jia, Ning,Wang, Hongbo,Jin, Xiaoying,&Li, Xinyu.(2022).Thermal conductivity contrast effect of organic soils and its environmental implications.COLD REGIONS SCIENCE AND TECHNOLOGY,196.
MLA	He, Ruixia,et al."Thermal conductivity contrast effect of organic soils and its environmental implications".COLD REGIONS SCIENCE AND TECHNOLOGY 196(2022).