GRACE卫星与GLDAS模型在东北黑土区地下水储量变化估算中的应用

Application of GRACE Satellite and GLDAS Model in Groundwater Storage Anomaly Estimation in Black Soil Region of Northeast China

东北黑土区是我国重要的商品粮供应地及工业基地,为监测并分析该区域地下水储量变化情况,利用GRACE重力卫星数据,结合GLDAS水文模型,反演东北黑土区2002—2021年地下水储量的时空变化。结果表明,东北三省地下水储量变化呈波动下降趋势,整体呈现由北向南的逐渐递减。其中,黑龙江省地下水储量变化幅度最小,吉林省次之,辽宁省地下水储量变化下降最为明显。与实测地下水位进行对比验证后,证明拟合效果较好,获取的数据能够为决策部门提供科学依据及数据支撑。未来,GRACE卫星有可能成为评价大尺度区域地下水资源变化及其变化趋势的新方法。

Northeast black soil region is an important supply of commodity grain and industrial base in China.In order to monitor and analyze the change of groundwater storage,we use GRACE gravity satellite data and GLDAS hydrological model to infer the spatial and temporal variation of groundwater resources in the Black Soil Area of Northeast China from 2002 to 2021.The results indicate that the groundwater storage showed a fluctuating downward trend,accompanied with a gradual decline from north to south as a whole.The range of groundwater storage anomaly in Heilongjiang Province is the smallest,followed by Jilin Province,and Liaoning Province is the most obvious.It is proved that the fitting effect is good after verification with the observed groundwater level,and the obtained data can provide scientific basis and data support for relevant decision-making departments.In the future,GRACE satellite will provide an unprecedented opportunity and a new calculation method for evaluating the changes and trends of groundwater resources in large scale regions.