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Study of seasonal snow cover influencing the ground thermal regime on western flank of Da Xing'anling Mountains,northeastern China

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Research in Cold and Arid Regions 2015年第6期7卷 666-674页

作者： XiaoLi Chang HuiJun Jin YanLin Zhang HaiBin Sun Hunan University of Science and Technology State Key Laboratory of Frozen Soils Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Gen'he Meteorological Administration

Although many studies relevant to snow cover and permafrost have focused on alpine, arctic, and subarctic areas, there is still a lack of understanding of the influences of seasonal snow cover on the thermal regime of the soils in permafrost regions in the mid-latitudes and boreal regions, such as that on the westem flank of the Da Xing＇anling （Hinggan） Mountains, northeastern China. This paper gives a detailed analysis on meteorological data series from 2001 to 2010 provided by the Gen＇he Weather Station, which is located in a talik of discontinuous permafrost zone and with sparse meadow on the observation field. It is inferred that snow cover is important for the ground thermal regime in the middle Da Xing＇anling Mountains. Snow cover of 10-cm in thickness and five to six months in duration （generally November to next March） can reduce the heat loss from the ground to the atmosphere by 28%, and by 71% if the snow depth increases to 36 cm. Moreover, the occurrence of snow cover resulted in mean annual ground surface temperatures 4.7-8.2℃ higher than the mean annual air temperatures recorded at the Gen＇he Weather Station, The beginning date for stable snow cover establishment （SE date） and the initial snow depth （SDi） also had a great influences on the ground freezing process. Heavy snowfall before ground surface freeze-up could postpone and retard the freezing process in Gen＇he. As a result, the duration of ground freezing was shortened by at least 20 days and the maximum depth of frost penetration was as much as 90 cm shallower.

关键词： snow cover thermal regime ground freezing Da Xing'anling Mountains northeastern China

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The effects of water flow and temperature on thermal regime around a culvert built on permafrost

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Research in Cold and Arid Regions 2014年第5期6卷 415-422页

作者： Loriane Périer Guy Doré C.R.Burn Loriane Perier Guy Dore C. R. Bum Laval University Center for Northern Studies (CEN) 1035 Avenue De la m~decine QuObec Canada G1A OA6 Carleton University Dept. of Geography and Environmental Studies Ottawa Ontario Canada K1S 5B6

Temperature and water flow through a culvert beneath the Alaska Highway near Beaver Creek,Yukon,were measured at hourly intervals between June and October *** data were used to simulate the effect of the culvert on the thermal regime of the road embankment and subjacent permafrost.A 2-D thermal model of the embankment and permafrost was developed with TEMP/W and calibrated using field *** relations were obtained between water temperatures at the entrance to the culvert,flow into the culvert,and water temperatures inside the *** temperatures at the entrance and inside the culvert had a linear relation,while water temperatures inside the culvert and water flow were associated by a logarithmic relation.A multiple linear regression was used to summarize these *** this relationship,changes in the flow rate and water temperatures at the entrance of the culvert were simulated to obtain predicted water temperatures in the *** temperatures in the culvert were used in the thermal model to determine their effects on the ground thermal regime near the *** of ±10% in water flow rate had no impact on the thermal regime underneath the *** of water temperature at the entrance of the culvert had a noticeable influence on the thermal regime.A final simulation was conducted without insulation beneath the *** thaw depth was 30 cm with insulation,and 120 cm without insulation,illustrating the importance of insulation to the ground thermal regime.

关键词： culvert thermal regime water flow water temperature modeling permafrost

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The Study of the Influence of the Froude Criterion and of the thermal regime upon the Quality of the Granular Frozen Products by the Process of Fluidization

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Journal of Mechanics Engineering and Automation 2020年第4期10卷 120-127页

作者： Mihaela-Gabriela Chirilă Technological High School“Simion Mehedinți” The Department of Food Science and EngineeringUniversity“Dunarea de Jos”GalaţiGalați 800344Romania

In the first part of the research,it was shown that the main factors that are responsible for the quality of the granular food products frozen using the fluidization method,are the size and the shape of the product that is exposed to the freezing by fluidization process,the heat transfer coefficients,the temperature,and the speed of the fluidization *** these factors are responsible for the size and the distribution of the ice crystals that are formed during the freezing *** qualitative characteristic that is modified after the freezing by fluidization process is the structural-textural stiffness.

关键词： Quality granular products fluidization thermal regime

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thermal state of soils in the active layer and underlain permafrost at the kilometer post 304 site along the China-Russia Crude Oil Pipeline

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Journal of Mountain Science 2016年第11期13卷 1984-1994页

作者： WANG Yong-ping LI Guo-yu JIN Hui-jun LU Lan-zhi HE Rui-xia ZHANG Peng State Key Laboratory of Frozen Soils Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China Beifang University of Nationalities Yinchuan 750000China Nanjing Tech University Nanjing 210009China

On-site monitoring is very important for understanding formation mechanisms of frost hazards frequently occurring in pipeline foundation soils and for designing and deploying according mitigative measures in permafrost *** thaw subsidence of ground surfaces along the ChinaRussia Crude Oil Pipeline(CRCOP) from Mo'he to Daqing,Heilongjiang Province,Northeast China have been observed at some segments underlain by ice-rich warm(>1.0°C) permafrost since the official operation in January *** monitoring results of the thermal states of foundation soils at the kilometer post(KP) 304 site along the CRCOP are presented in this *** results indicate that during the period from 2012 to 2014,shallow soils(at the depths from0.8 to 4.0 m from ground surface) has warmed by approximately 1.0°C in the lateral range of 1.2 to 2.1 maway from the pipeline axis,and deeper permafrost(such as at the depth of 15 m,or the depth of zero annual amplitude of ground temperatures) by 0.08°C per year 4 m away from the pipe axis,and 0.07°C per year 5 m away from the pipeline *** results indicate an all-season talik has developed around and along the *** thaw bulb,with a faster lateral expansion(compared with the vertical growth),enlarges in summer and shrinks in *** research will provide important references and bases for evaluating thermal influences of warm pipeline on permafrost and for design,construction,operation and maintenance of pipelines in permafrost regions.

关键词： China-Russia Crude Oil Pipeline Permafrost thermal regime Talik formation Thaw subsidence

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Stream temperature dynamics in Nam Co basin, southern Tibetan Plateau

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Journal of Mountain Science 2017年第12期14卷 2458-2470页

作者： GAO Tan-guang KANG Shi-chang ZHANG Ting-jun YANG Da-qing SHANG Jian-guo QIN Xiang College of Earth and Environmental Sciences Lanzhou University State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences National Hydrology Research Centre Environment Canada Saskatoon Saskatchewan

Stream temperatures are sensitive to climate change and runoff regime variations. A comprehensive understanding on the effects of glacial melting on the stream temperatures are important in the Tibetan Plateau, of which contains the largest ice volume outside Polar Regions. This study documented the high-resolution stream temperature thermal regimes from glacier-fed and non-glacial rivers at four sites, versus a high-resolution glacier mass balance monitoring at Zhadang glacier, during summer melt seasons from 2007-2009 in the Nam Co basin of southern Tibetan Plateau. The results showed mean summer stream temperature and magnitude of daily thermal variation were lower at all sites when compared with alpine glacierized environments at lower latitudes. Mean stream temperatures for glacier-fed rivers(4.0℃ to 6.5℃)were minimum and least variable near the glacier terminus with increasing toward downstream(+0.13℃ km^(–1) to +0.28℃ km^(–1)). Meanwhile, stream temperature in 2008 was similar to that in 2007 and2009. For the non-glacial rivers, mean stream temperatures was about 9.0℃ with significantly warmer in summer months in 2009 and 2007 than that in 2008. These differences indicated that stream temperature was strongly influenced by discharge and precipitation. Particularly, the glacier mass balance played a large role on the stream temperature directly when the glacier melt contributed more than 50% of the glacial river runoff. Our results demonstrated the stream thermal variability from southern Tibetan rivers and provided new insight into the influence of glacier mass balance on stream thermal variability in high-altitude river system.

关键词： Stream temperature thermal regime Glacier mass balance Tibetan Plateau

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Numerical analysis of applying special pavements to solve the frost heave diseases of high-speed railway roadbeds in seasonally frozen ground regions

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Research in Cold and Arid Regions 2015年第4期7卷 340-347页

作者： Chang Yuan FuJun Niu QiHao Yu XinBin Wang Lei Guo YanHui You State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental and Engineering Research InstituteCAS University of Chinese Academy of Sciences

The Haerbin-Dalian Passenger Dedicated Line is the first high-speed railway constructed in the seasonally frozen ground regions of northeastern China. Frost heave diseases occurred in the first winter of its operation （between October 2012 and January 2013）, and frost heave was observed mainly in the roadbed fills that were considered not susceptible to frost heave. This paper proposes applying two special pavements -- black pavement and insulation-black pavement -- to improve the thermal regime of the roadbed. Three numerical models of the roadbed temperature field were built based on the field con- ditions of the Changchun section （D3K692＋840 to D3K692＋860）. The results show that：（1） Compared with cement pave- ment, black pavement and insulation-black pavement could reduce the freezing index at the roadbed surface by 37% and 64%, respectively, which could influence the maximum frozen depth; （2） the maximum frozen depths under the black pavement and insulation-black pavement were respectively 1.3-1.4 m and 1 m. Compared with cement pavement, they could reduce the maximum frozen depth by 0.4 m and 0.7-0.8 m, respectively, which would reduce the permitted amount of frost heave by 4 mm and 7-8 ram, which would meet the deformation limit established by the Code for Design on Special Subgrade of Railway; （3） the freezing periods of the black pavement and the insulation-black pavement were, respectively, approximately four months and two months. Compared with cement pavement, they could reduce the freezing period by approximately 19 days and 40 days, respectively, and delay the initial freezing time by 9 days and 18 days; and （4） compared with cement pavement, black pavement and black-insulation pavement could reduce the frozen areas of roadbeds in the cold season, which suggests that these two special pavements could provide better thermal stability for roadbeds.

关键词： frost heave numerical simulation special pavement thermal regime

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