摘要
变形监测是大坝安全运行的重要支撑。针对SAR卫星在拱坝变形监测中无法采用传统数字地形获取坝体侧面高程相位的难题,提出了一种结合三维点云的高分辨率SAR卫星监测拱坝变形方法。该方法通过距离-多普勒模型对朝向雷达方向的坝体三维点云进行坐标转换,并结合干涉对基线信息对坝体高程进行精确仿真,最后进行坝体视线向-水平形变投影,以实现毫米级精度的拱坝形变场提取。该方法的实例应用显示,观测到的坝体水平变形结果精度可达4 mm左右。随着SAR卫星分辨率的提高和数量的增加,此方法有望实现更高频次和更高精度的坝体变形监测。
Deformation monitoring is an important support for the safe operation of dams.Aiming at the problem that SAR satellite cannot use traditional digital terrain to obtain the elevation phase of dam side in arch dam deformation monitoring,this paper proposed a new arch dam deformation monitoring method by high-resolution SAR satellite combined with 3D point cloud.In this method,the distance-Doppler model was used to transform the 3D point cloud of a dam towards the radar direction,and the interference baseline information was used to accurately simulate the dam heights.Finally,the dam horizontal deformation projection to sight direction was carried out to realize the deformation field extraction of the arch dam with millimeter accuracy.The engineering application showed that the observed horizontal deformation accuracy of the dam body can reach about 4 mm.With the improvement of the resolution and the increase of the number of SAR satellites,this method is expected to achieve higher frequency and higher precision dam deformation monitoring.
作者
曾广栋
陈一鸣
侯春尧
谭大文
刘杰
李陶
ZENG Guangdong;CHEN Yiming;HOU Chunyao;TAN Dawen;LIU Jie;LI Tao(China Yangtze Power Co.,Ltd.,Yichang 443002,China;Changjiang Spatial Information Technology Engineering Co.,Ltd.,Wuhan 430010,China;National Dam Safety Research Center,Wuhan 430010,China;Global Navigation Satellite System(GNSS)Research Centre,Wuhan University,Wuhan 430079,China)
出处
《人民长江》
北大核心
2024年第12期237-244,共8页
Yangtze River
基金
三峡金沙江川云水电开发有限公司永善溪洛渡电厂科研项目(Z412202005)
国家自然科学基金项目“特高拱坝库坝区渗流-变形耦合演化机理与协同安全控制”(U2340228)
国家自然科学基金面上项目“星载SAR时间序列与人工角反射器阵列结合探测边坡变形的理论与方法研究”(42074031)。
