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- Title
松嫩平原北部季节冻土冻融过程及热量传递规律.
- Authors
韩红卫; 邱奇隆; 宋春山; 姜海强; 汪恩良
- Abstract
To provide an in-depth understanding of the freeze-thaw process and heat transfer law of the seasonal frozen soil in the northern part of the Songnen Plain. Meanwhile, it provides scientific basis for the efficient use of soil environment in the cold area engineering and cold area agriculture in northeast China. Based on the in situ monitoring of seasonal frozen soil in the northern part of the Songnen Plain, research on the characteristics of seasonal frozen soil temperature change and the change pattern of stratified heat flux was carried out. The results show that the daily variation of soil temperature at depths less than 50 cm is obvious, and the seasonal difference in soil temperature decreases with increasing soil depth. The maximum freeze depth (164 cm) is reached on March 3, 2017, and the final thaw date is April 22, with a final thaw depth of 130 cm. The response of soil temperature to surface temperature at different depths show a hysteresis effect, and the hysteresis time increas with the increase of soil depth. Seasonal frozen soils are subjected to net radiation during the freeze-thaw period and heat exchange is extremely frequent in the shallow soils. As the depth of soil layer increases, the effect of net radiation decreases, the loss of heat transfer in the soil increases, the degree of heat exchange decreases, and during the freezing period, the heat lost from the soil is greater than the heat absorbed. Maintaining negative values throughout the freeze-thaw period, the heat in the soil below the freeze-depth line continues to be transferred upward, indicating that the soil continues to transfer heat to the permafrost layer below 160 cm depth.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 35, p14947
- ISSN
1671-1815
- Publication type
Article