Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-01-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/1/244 |
| _version_ | 1811186426288537600 |
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| author | Andrea Di Pasquale Giovanni Nico Alfredo Pitullo Giuseppina Prezioso |
| author_facet | Andrea Di Pasquale Giovanni Nico Alfredo Pitullo Giuseppina Prezioso |
| author_sort | Andrea Di Pasquale |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T13:45:33Z |
| format | Article |
| id | doaj.art-84652f101c1b484fba12895b1b71c97d |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T13:45:33Z |
| publishDate | 2018-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-84652f101c1b484fba12895b1b71c97d2022-12-22T04:21:07ZengMDPI AGSensors1424-82202018-01-0118124410.3390/s18010244s18010244Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk AssessmentAndrea Di Pasquale0Giovanni Nico1Alfredo Pitullo2Giuseppina Prezioso3DIAN srl, 75100 Matera, ItalyConsiglio Nazionale delle Ricerche, Istituto per le Applicazioni del Calcolo, 70126 Bari, ItalyConsorzio di Bonifica di Capitanata, 71121 Foggia, ItalyDipartimento di Science e Tecnologie, Università degli Studi di Napoli “Parthenope”, 80133 Naples, ItalyThe 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.http://www.mdpi.com/1424-8220/18/1/244ground-based radarSynthetic Aperture Radar (SAR)Real Aperture Radar (RAR)SAR interferometryearth dam |
| spellingShingle | Andrea Di Pasquale Giovanni Nico Alfredo Pitullo Giuseppina Prezioso Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment Sensors ground-based radar Synthetic Aperture Radar (SAR) Real Aperture Radar (RAR) SAR interferometry earth dam |
| title | Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment |
| title_full | Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment |
| title_fullStr | Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment |
| title_full_unstemmed | Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment |
| title_short | Monitoring Strategies of Earth Dams by Ground-Based Radar Interferometry: How to Extract Useful Information for Seismic Risk Assessment |
| title_sort | monitoring strategies of earth dams by ground based radar interferometry how to extract useful information for seismic risk assessment |
| topic | ground-based radar Synthetic Aperture Radar (SAR) Real Aperture Radar (RAR) SAR interferometry earth dam |
| url | http://www.mdpi.com/1424-8220/18/1/244 |
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