利用gPhone重力仪监测三峡库区蓄水的重力响应

Detecting the Gravimetric Response of Impound in the Three Gorges Reservoir Area Using gPhone Gravimeter in Zigui

根据三峡秭归gPhone101~#重力台站2012-06~2014-08重力观测资料,经处理改正得到的重力残差主要反映了库区蓄水变化的重力响应。不同的蓄水阶段,重力残差与库区水位变化响应特征不同,高差30m的水位波动能够引起70μGal的重力响应。利用gPhone重力仪能够有效监测三峡库区蓄水的重力响应,但局部及周边地区降水等水文效应也是连续重力观测结果的主要贡献之一,在监测库区蓄水对重力响应的影响时不可忽视。

According to the observation data of gPhone101# gravimeter in Zigui during 2012-06-2014- 08, the corrected gravity residuals reflect the gravimetric response caused by reservoir impound chan- ges. For different impound stages, gPhone101# gravity residual shows different response characteris tics. Thirty meters elevation fluctuations of water level can cause a 70 μGal gravimetric response. A gPhone can detect the gravimetric response of Three Gorges Reservoir area effectively. However, lo- cal rainfall hydrological effects are also important contributors to gravimetric response and should not be neglected when we detect the influences of impound.