GBInSAR隔河岩大坝变形监测试验  

Monitoring of Geheyan Dam deformation using GBInSAR technology

作　　者：黄其欢[1] 岳建平[1] 贡建兵[2] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]湖北清江水电开发有限责任公司库坝中心,湖北宜昌443000

出　　处：《水利水电科技进展》2016年第3期47-51,共5页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(41304025);江苏省自然科学基金(BK20130831);国家留学基金(201406715025)

摘　　要：为解决传统大坝变形监测方法仅能获取点变形信息,且监测周期长、劳动强度大等问题,将地基合成孔径雷达干涉(GBIn SAR)变形监测新技术用于大坝变形监测。分析GBIn SAR变形监测系统及其成像特点,建立利用稳定参考点进行大气校正的数学模型,并应用于清江隔河岩大坝监测。结果表明:在距离1 300 m处大气扰动误差可达85 mm,雷达视线向大气扰动是影响GBIn SAR变形监测精度的主要因素;消除大气影响后GBIn SAR监测的坝体变形速率与垂线监测结果一致;大坝表孔泄水闸变形明显大于坝体变形,且随水位上升变形量增大。To overcome the disadvantages of conventional dam deformation monitoring methods, which are high labor intensity, long cycle, and acquiring of only pointwise information, a recently developed technology, called ground-based synthetic aperture radar interferometry ( GBInSAR) , was applied to dam deformation monitoring. Based on an analysis of the GBInSAR system and imaging characteristics, a numerical model for atmospheric phase correction using a stable reference point was established and applied to monitor the deformation of the Geheyan Dam. The results show that at a location of 1 300 m downstream of the dam, atmospheric disturbance caused an error of up to 85 mm. Atmospheric disturbance interfering with the sight of radars was the main factor decreasing the accuracy of dam deformation monitoring with GBInSAR technology. After elimination of the influence of atmospheric disturbance, the results of dam deformation monitoring with GBInSAR technology agreed with plummet observations. The results also show that the deformation of the water release gate at the surface outlet was significantly greater than the dam body deformation, and it increased with the rise of the water level.

关 键 词：隔河岩大坝 变形监测 GBInSAR IBIS-L 大气校正 永久散射体 

分 类 号：TV698.11[水利工程—水利水电工程]