Increase in thermal groundwater due to a flowing well near the Songshan hot spring in Beijing,China |
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| Authors: | Zhou Xun Li Juan Zhou Haiyan Fang Bin Yu Lan Li Shijun |
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| Institution: | (1) School of Water Resources and Environment, and Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences, Xueyuan Road 29, Beijing, 100083, People’s Republic of China |
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| Abstract: | The Songshan hot spring occurs in granite in Yanqing County in northwestern Beijing, China. TDS of the hot water ranges from
459 to 475 mg/L and pH varies between 8.6 and 9.13. The water is of Na–SO4 type. Isotopic analyses indicate that the hot spring is meteoric in origin and receives recharge from precipitation in the
northern and northwestern granite mountain with elevation of about 1,600–1,800 m. The depth of circulation of the thermal
groundwater is estimated to be 2,240 m below the spring’s threshold and the temperature of the geothermal reservoir, 76°C.
The residence time of the thermal groundwater is estimated to be about 52 years. A flowing well near the spring has chemical
compositions and formation conditions similar to the spring. The discharge of the flowing well is approximately eighteen times
larger than that of the spring and the residence time of the former (about 15.4 years) is about three times smaller than that
of the latter. Although the well and spring are close to each other, the well’s larger flow rates, indicated residence time
and high hydraulic head suggest that the well taps a separate, but genetically similar flow system. |
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| Keywords: | Hot spring Thermal groundwater Geothermal resource Isotope Beijing |
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