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HYDROTHERMAL REGIME ANALYSIS OF SHALLOW DEPTH OF A SOIL SLOPE DURING SHORT-TERM FREEZE-THAW CYCLES
Session: Characterization of Permafrost State and Variability II / Caractérisation et variabilité du pergélisol II
Yun Que, College of Civil Engineering,Fuzhou University (China)
Xiaopeng Chen, College of Civil Engineering,Fuzhou University (China)
Jinyuan Liu, Department of Civil Engineering, Ryerson University (Canada)
This paper presents a study on hydrothermal regime in shallow depth of soil slope during short-term freeze-thaw cycles. The study is conducted by combining both meteorological monitoring and numerical simulation methods and taking a typical short-term frozen zone in Fujian province of China as an example. From December 2013 to February 2014, there were a total of 18 times of freeze-thaw cycles of ambient air temperature: 16 times of two-day, one time of three-day, and one time of six-day cycles. During these short-term freeze-thaw cycles, the air temperature reached the lowest at -4.4oC and the highest at 10.8oC. The peak of daily radiation ranged from 41 to 827 W/m2 with an average wind speed from 3.5 to 3.7 m/s. During two-day freeze-thaw cycle of air temperature, the soil freezing time was between 3:00 am and 8:00 am. Based on this study, it is found that air temperature is a major factor in soil freezing, but it is not easy for soil to be frozen in shorter frozen duration.
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