Ground temperature prediction based on shallow-surface ground temperature and in-situ thermophysical parameters

In recent years, geothermal resources as a new clean energy have begun to attract widespread attention.China is rich in shallow geothermal energy resources, but exploration methods limit its large-scale development. Thermophysical parameter is one of the key parameters of geothermal energy carrier, which determines the thermal energy transmission speed and the distribution of the temperature field of the rock and soil. Therefore, shallow temperature measurement and in-situ thermophysical parameter tester based on thermophysical parameters were used to acquire ground temperature and thermophysical parameters in the field tests.The one-dimensional steady-state heat conduction theory was used to establish the geothermal field prediction model, and the lithological measurement and generalized thermal physical parameters were used to predict the geothermal field distribution of the constant temperature layer. The results show that the shallow geothermal field is greatly affected by the river water flow. The adoption of lithology generalization and the measured thermal physical parameters resulted in almost the same prediction of the temperature field of the constant temperature layer, indicating that it is very effective to predict the distribution of the temperature field of the constant temperature layer by using the developed instruments and models. In addition, the method is convenient and fast, which can be used to provide reasonable suggestions for the development and utilization of shallow geothermal energy, and it can be widely used in practical projects.