大坝变形监测是确保大坝安全的重要一环。基于地基合成孔径雷达 (GB-SAR)的大坝变形监测相较于传统的方法拥有精度高、覆盖面大等优点。相较于国内通常使用的数据采集速度为5 min/组的意大利IBIS变形监测设备,采用新型的基于调频连续波(FMCW)技术的Fast-GBSAR设备对陆水大坝进行监测,取得了7 s/组的数据采集速度,对大坝在放水前后的变形进行分析,并与三维数字高程模型进行数据融合。结果表明基于7 s/组的高速数据采集能力,Fast-GBSAR几乎可以做到对大坝变形的实时分析,在变形监测领域极具潜力。
Abstract
Dam deformation monitoring is an important task to refrain from hazardous situation for dam and population. The use of Ground Based Synthetic Aperture Radar (GB-SAR) provides great potential for dam deformation monitoring due to its strong capability of large area and high accuracy. In this paper, a Fast-GBSAR based on the Frequency Modulated Continuous Wave (FMCW) technology is presented to monitor the dam deformation when the dam discharges water. The data acquisition speed of the Fast-GBSAR could achieve 7 second per set, compared with 5 minute per set acquisition speed of the IBIS system. Besides, the SAR image is also combined with the DEM model to evaluate the overall deformation of the dam. Analytical results show that dam monitoring based on Fast-GBSAR can be nearly in real time.
关键词
地基合成孔径雷达 /
调频连续波 /
大坝变形监测 /
精度分析 /
三维数字高程模型
Key words
GB-SAR /
FMCW /
dam deformation measurement /
accuracy analysis /
3D DEM
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参考文献
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基金
浙江海洋大学科研启动经费项目(21045012815);浙江省自然基金委青年基金项目 (LQ15F030007);浙江省教育厅项目(Y201432290)
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