基于多源数据的华北平原地下水储量时空变化分析

利用GRACE卫星数据反演华北平原2003~2015年地下水储量变化，并用监测井数据进行验证。基于EOF方法分解GRACE年际地下水储量变化，结合冬小麦年均WFblue和TRMM降雨数据分析影响华北平原地下水储量年际变化的因素。结果表明，前2个特征向量方差贡献率为93.09%。其中，第1模态方差贡献率为80.04%，与华北平原2003~2009年冬小麦年均WFblue空间变化的相关系数为-0.69，且空间分布一致；第2模态方差贡献率为13.05%，与同时段降水数据的空间分布的相关系数为0.93。说明农业灌溉，尤其是冬小麦的灌溉对华北平原地下水的消耗起着至关重要的作用。

Analysis of Temporal and Spatial Changes of Groundwater Storage in North China Plain Based on Multi-Source Data

Using GRACE satellite data, we inverse the changes of groundwater storage in North China plain from 2003 to 2015. The effectiveness of this method is verified by the groundwater level data of monitoring wells. The changes of GRACE interannual groundwater storage is decomposed based on EOF method, and we analyze the factors affecting the interannual changes of groundwater storage in North China plain combined with the annual average WFblue of winter wheat and TRMM precipitation data. The results show that the variance contribution of the first two eigenvectors is 93.09%. The contribution rate of the first mode variance is 80.04%, and the correlation coefficient between the first mode variance and the annual average WFblue spatial change of winter wheat in North China plain from 2003 to 2009 is -0.69, with consistent spatial distribution; the contribution rate of the second mode variance is 13.05%, and the correlation coefficient with the spatial distribution of precipitation data in the same period is 0.93. This research shows that the agricultural irrigation, especially for winter wheat, plays a vital role in the depletion of groundwater in the North China plain.