Variation characteristics and sustainable utilization of geothermal water resources in Central Hebei Plain: A case study of Xinji geothermal field
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Abstract:
In view of the sharp decline of groundwater level during the development and utilization of geothermal water resources at Xinji county in Central Hebei Plain, this paper studied the inter-annual and annual variation characteristics and trend of the groundwater level and the variation pattern of the water level decline in the geothermal field since 1999, as well as their relationship with the annual precipitation in the upstream mountains. The results showed that: (1) As geothermal water yield increases, the groundwater level of the geothermal field declines, and the growth of groundwater level at the non-heating period is decreasing year by year. (2) The development and utilization of the geothermal field is not simply consumption of groundwater storage resources. The groundwater level decline range is not only related to the amount of geothermal water yield, but also to the annual precipitation in the upstream mountains. As the annual precipitation increases (decreases), the decline of groundwater level decreases (increases). (3) The groundwater resources of the geothermal field have already been over-exploited. It is urgent to control the exploitation or increase the supply.
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