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基于地面雷达干涉测量法的土坝监测策略：如何提取用于地震风险评估的有用信息。

Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment.

作者信息

Di Pasquale Andrea, Nico Giovanni, Pitullo Alfredo, Prezioso Giuseppina

机构信息

DIAN srl, 75100 Matera, Italy.

Consiglio Nazionale delle Ricerche, Istituto per le Applicazioni del Calcolo, 70126 Bari, Italy.

出版信息

Sensors (Basel). 2018 Jan 16;18(1):244. doi: 10.3390/s18010244.

DOI:10.3390/s18010244
PMID:29337884
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5795412/
Abstract

The aim of this paper is to describe how ground-based radar interferometry can provide displacement measurements of earth dam surfaces and of vibration frequencies of its main concrete infrastructures. In many cases, dams were built many decades ago and, at that time, were not equipped with in situ sensors embedded in the structure when they were built. Earth dams have scattering properties similar to landslides for which the Ground-Based Synthetic Aperture Radar (GBSAR) technique has been so far extensively applied to study ground displacements. In this work, SAR and Real Aperture Radar (RAR) configurations are used for the measurement of earth dam surface displacements and vibration frequencies of concrete structures, respectively. A methodology for the acquisition of SAR data and the rendering of results is described. The geometrical correction factor, needed to transform the Line-of-Sight (LoS) displacement measurements of GBSAR into an estimate of the horizontal displacement vector of the dam surface, is derived. Furthermore, a methodology for the acquisition of RAR data and the representation of displacement temporal profiles and vibration frequency spectra of dam concrete structures is presented. For this study a Ku-band ground-based radar, equipped with horn antennas having different radiation patterns, has been used. Four case studies, using different radar acquisition strategies specifically developed for the monitoring of earth dams, are examined. The results of this work show the information that a Ku-band ground-based radar can provide to structural engineers for a non-destructive seismic assessment of earth dams.

摘要

本文旨在描述地基雷达干涉测量法如何能够提供土坝表面的位移测量数据以及其主要混凝土基础设施的振动频率。在许多情况下，水坝是几十年前建造的，当时建造时并未在结构中嵌入现场传感器。土坝具有与滑坡相似的散射特性，基于地面合成孔径雷达（GBSAR）技术迄今已广泛应用于研究地面位移。在这项工作中，SAR和实孔径雷达（RAR）配置分别用于测量土坝表面位移和混凝土结构的振动频率。描述了一种获取SAR数据和呈现结果的方法。推导了将GBSAR的视线（LoS）位移测量转换为坝表面水平位移矢量估计所需的几何校正因子。此外，还介绍了一种获取RAR数据以及表示坝混凝土结构位移时间剖面和振动频谱的方法。对于本研究，使用了配备具有不同辐射方向图的喇叭天线的Ku波段地基雷达。研究了四个案例，这些案例采用了专门为监测土坝而开发的不同雷达采集策略。这项工作的结果表明，Ku波段地基雷达可以为结构工程师提供有关土坝无损地震评估的信息。

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Space geodetic monitoring of engineered structures: The ongoing destabilization of the Mosul dam, Iraq.空间大地测量监测工程结构：伊拉克摩苏尔大坝的持续失稳。
Sci Rep. 2016 Dec 6;6:37408. doi: 10.1038/srep37408.
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Dynamic Assessment of Masonry Towers Based on Terrestrial Radar Interferometer and Accelerometers.基于地面雷达干涉仪和加速度计的砌体塔动态评估。
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Integrated Ground-Based SAR Interferometry, Terrestrial Laser Scanner, and Corner Reflector Deformation Experiments.基于地面的 SAR 干涉测量、地面激光扫描仪和角反射器变形实验的综合研究。
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