Establishment and Verification of a Thermal Calculation Model Considering Internal Heat Transfer of Accumulated Water in Permafrost Regions

• Published in: Frontiers in Earth Science
• Main Authors: Peng, Erxing, Hu, Xiaoying, Sheng, Yu, Zhou, Fansheng, Wu, Jichun, Cao, Wei
• Other Authors: National Natural Science Foundation of China, Natural Science Foundation of Gansu Province, State Key Laboratory of Frozen Soil Engineering, Lanzhou University of Technology
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Frontiers Media SA 2021
• Subjects: General Earth and Planetary Sciences; Ice; permafrost
• Online Access: http://dx.doi.org/10.3389/feart.2021.733483; https://www.frontiersin.org/articles/10.3389/feart.2021.733483/full

Water accumulation in permafrost regions causes a heavy thermal impact on the frozen layer, thereby leading to its degeneration. First, based on the real heat transfer process, this study proposes relevant hypotheses and governing equations for heat calculation models involving completely melted water, ice-bearing water, water–soil interface, and soil under water. The models consider the water surface as a thermal boundary on account of the natural buoyancy convection mechanism in water and the phase transition process. Second, this study verifies the accuracy of the calculation models regarding the measured water and permafrost temperatures. The four seasonal vertical temperature changes in the water according to this model are found to be consistent with the actual temperature-change trend, and the permafrost temperature under water is also consistent with the actual temperature field. This study thus provides theoretical support for the thermal impact analysis of water in permafrost regions.