海南琼中台GPS垂直分量变化与降水、地下水位关系研究

THE RELATIONSHIP BETWEEN GPS VERTICAL COMPONENT,RAINFALL AND GROUNDWATER IN QIONGZHONG STATIONS

针对1999~2012年海南省琼海加积井、儋州西流井的降水、水位观测资料,系统分析降水、地下水位与琼中GPS定点观测垂直分量时间序列形态变化图像的关系。研究表明,降水、水位和GPS垂直分量变化之间呈现出明显的年周期变化特征,并且彼此呈负相关。具体表现为：降水增加、水位上升,则GPS垂直分量变小,意味着地面隆起;反之,降水减少、水位下降,则GPS垂直分量增大,意味着地面下沉。对降水和水位变化引起GPS垂直分量改变的机理进行初步讨论。

The relationship between precipitation, groundwater level and vertical component of GPS fixed-obser- vation time series of images in Qiongzhong stations was systematically analyzed using groundwater and rainfall obser- vation data of Jiaji well and Xiliu well during 1999 to 2012. The preliminary results show that rainfall, groundwater level and GPS vertical component all have a year cycle, and the relationship between each others is contravariant： when rainfall increases and groundwater level rises, the GPS vertical component decreases which means the land up- lifts ;otherwise, when the rainfall decreases and the groundwater level declines, GPS vertical component increases which means the land subsidences. Finally, the mechanism of the GPS vertical component changes caused by the rainfall and groundwater level variation were discused.