冀中平原地热水资源变化特征与可持续利用性——以辛集地热田为例

针对冀中平原辛集地区地热水开发利用中出现的地下水位大幅下降问题,通过研究1999年以来该地热田地下水位的年际及年内变化特征、趋势和地下水位降幅变化规律,及其与上游山区年降水量之间关系,结果表明:(1)辛集地热田地下水水位下降幅度,不只是随着地热水开采量变化而变化,还存在其他影响因素。有些年份,开采量增大,而地下水位的降幅却减小,表明该地热田存在外域补给水源的补给。(2)通过该地热田地下水位下降幅度与上游山区年降水量之间关系分析表明,随着上游山区年降水量明显增大(或减小),该区地下水位降幅呈减小(或增大)特征,辛集地热田地热水资源具有一定的更新补给能力。(3)目前该地热田地下水资源开发利用已处于超采状态,急需压采或人工增大补给等措施。

Variation characteristics and sustainable utilization of geothermal water resources in Central Hebei Plain: A case study of Xinji geothermal field

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.