利用时变重力数据反演地下水储量变化

Groundwater reserves changes from time-varying gravity data

为了反映中国陆地区域地下水储量的变化情况,该文利用2003—2019年间GRACE、GRACE-FO重力卫星数据,对8个典型区域地下水储量变化情况进行了研究,并结合气象资料从相关性上分析各区域地下水储量显著变化的原因。结果表明,中国东南大部分地区地下水储量逐年增加,地下水主要靠降水补给;华北平原等人口稠密区地下水亏损严重,研究时段内持续呈下降趋势,降水仅能缓解地下水储量的亏损速度;天山山脉、念青唐古拉山脉等冰川区质量变化和温度异常的相关性较好,这些地区的质量亏损可能是冰川消融引起的。

In order to reflect the changes in groundwater reserves in China’s terrestrial regions,this paper uses GRACE and GRACE-FO gravity satellite data from 2003 to 2019 to study the changes in groundwater reserves in 8 typical regions.And combined with meteorological data to analyze the reasons for the significant changes in groundwater reserves in each region from the perspective of correlation.The results show that groundwater reserves in most parts of southeastern China are increasing year by year,and groundwater is mainly recharged by precipitation;The loss of groundwater in densely populated areas such as the North China Plain is serious,and it continues to show a downward trend during the study period.Precipitation can only alleviate the rate of loss of groundwater reserves;glacier areas such as the Tianshan Mountains and Nyainqentanglha Mountains have a good correlation with temperature anomalies.The quality loss in these areas may be caused by glacier melting.