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| Influencing factors of constant-temperature layer depth and its estimation in Shaanxi Province |
| ZHOU Yang1,2, ZHANG Hui1,2, JIANG Xingchen3, XU Zerun1,2, WANG Ke1,2, MU Genxu1,2 |
1. Shaanxi Institute of Geological Survey, Xi’an 710054, China;
2. Shaanxi Geological Survey Center of Hydrogeology, Engineering Geology and Environmental Geology, Xi’an 710068, China;
3. Zhongsheng Environmental Technology Development Co, Ltd, Xi’an 710000, China; |
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Abstract The prediction of the constant-temperature layer depth is closely related to geothermal energy development and underground space construction. Progress of research on regional constant-temperature layer in Shaanxi Province is relatively slow. This paper discusses the influencing factors of the constant-temperature layer depth and the results show that there is an inverse correlation between the thermal conductivity and the constant-temperature layer depth. And the surface heat transfer coefficient between the surface and the atmosphere is positively correlated with the constant-temperature layer depth. Besides, the annual amplitude of the atmospheric temperature is positively correlated with the constant-temperature layer depth. The thermal conductivity coefficient and the constant-temperature layer depth showed a significant positive correlation. This paper describes and validates a method for calculating the constant-temperature layer depth. And the authors calculated the theoretical value of constant-temperature layer depth for different geomorphic units by using this method. The constant-temperature layer depth is between 10.5 m and 23.8 m for the whole province and is between 10.5 m and 23.8 m in northern Shaanxi Province, with 11~17.4 m in Guanzhong Basin and 11.7~18.6 m in southern Shaanxi Province. The depth range of the regional constant-temperature layer in Shaanxi Province has been systematically divided in this research and this paper has contributed to the implementation of Shaanxi’s “Green” Catch-up and Transcendent policies.
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Received: 04 September 2018
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2019, Vol. 6 
