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[en] Geothermal resources in China are distributed throughout the country, with hydrothermal systems of high temperature in the Tibet Autonomous Region, Yunnan Province and Taiwan Island and hydrothermal systems of low-medium temperature mainly in various sedimentary basins. Development and exploration of geothermal energy in China are below expectations. The purpose of this study is to comparatively review the characteristics (geology, hydrogeology, hydrochemistry and geophysical data) of typical hydrothermal fields/areas and suggest development and utilization approaches in the future. Hydrothermal systems formed by mountain lifting contain a considerable amount of energy for geothermal power generation, especially in the Tibet Autonomous Region, Yunnan Province and Taiwan Island. However, geothermal water in the Tatun geothermal field has high TDS (total dissolved solids), an issue that requires more research to resolve this problem for power generation. The large storage of geothermal resources has been investigated in Meso–Cenozoic sedimentary basins; it is basically used for heating, bathing or greenhouse plantation. Moreover, hydrothermal resources of low-medium temperature can also be used in binary power plants. Although the enhanced geothermal systems (EGS) in China are promising, the resources have not yet been commercially exploited, because the emerging technologies (hydraulic fracturing) and concerns over environmental impacts (induced micro-seismicity) lead to slow development. On the contrary, shallow geothermal energy has been directly utilized mainly for heating and cooling buildings. Cities like Beijing, Tianjin and Shenyang have established a series of ground-source heat-pump systems, which has led to a massive reduction of CO2 emission of 19.87×106 t.
[en] This article provides the review of thirty chemical geothermometers of foreign authors for estimation of water temperature in geothermal aquifers in the central depression of the Danube Basin. The results of estimated water temperatures using chemical geothermometers were compared with the temperatures measured in respective geothermal boreholes. Consideration of the comparison resulted in a summary including selection of most suitable chemical geothermometers for each site to be used in hydrogeothermal praxis for water temperature determination. (authors)
[en] The Urban Heat Island is an area of the city that is significantly warmer than its immediate surroundings. This phenomenon exists in all layers of places, such as the atmosphere, the surface, or the subsurface. The greatest impact on this phenomenon is the anthropogenic activity of people, as the green areas (meadow, forest, fields) are replaced by artificial surfaces (asphalt, concrete, glass), which much more inhibit heat from the sun, not least heating, air conditioning, industry, to the right, because the air in the city heats up and increases the temperature in the cities. (authors)
[en] Correlation is the simplest case of statistical dependence on determining the severity of dependence between variable characters or properties of two or more variables. In our analysis, we used the Pearson correlation coefficient, which expresses the intensity of the linear correlation between the two random variables. The aim of the paper was to find out which landscape component most affected the temperature of the groundwater logically influenced the most. (authors)