Validating InSAR-SBAS results by means of different GNSS analysis techniques in medium- and high-grade deformation areas

Yalvaç, Sefa

doi:10.1007/s10661-019-8009-8

Cited by 38 publications

(25 citation statements)

References 24 publications

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“…Interferometric Synthetic Aperture Radar (InSAR) can provide much greater spatial resolution with reasonable accuracy (a few mm/yr). In places with a dense GNSS network, such as California, it has been proven that combining InSAR and GNSS can achieve regional coverage of coastal subsidence at both high accuracy and high spatial coverage (Blackwell et al., 2020; Farolfi et al., 2019; Hammond et al., 2018; Hu et al., 2019; Morishita, 2021; Yalvac, 2020). In places where GNSS stations are sparse or absent, InSAR remains the best tool to monitor coastal subsidence.…”

Section: Introductionmentioning

confidence: 99%

Subsidence in Coastal Cities Throughout the World Observed by InSAR

Wei

Dhondt

2022

Geophysical Research Letters

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We measured subsidence rates in 99 coastal cities around the world between 2015 and 2020 using the PS Interferometric Synthetic Aperture Radar method and Sentinel‐1 data. In most cities, part of the land is subsiding faster than sea level is rising. If subsidence continues at present rates, these cities will be challenged by flooding much sooner than projected by sea level rise models. The most rapid subsidence is occurring in South, Southeast, and East Asia. However, rapid subsidence is also happening in North America, Europe, Africa, and Australia. Human activity—primarily groundwater extraction—is likely the main cause of this subsidence. Expanded monitoring and policy interventions are required to reduce subsidence rates and minimize their consequences.

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Section: Introductionmentioning

confidence: 99%

Subsidence in Coastal Cities Throughout the World Observed by InSAR

Wei

Dhondt

2022

Geophysical Research Letters

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“…Unfortunately, in this region, Sentinel-1 data are acquired only on the descending pass. Continuous Global Navigation Satellite System (GNNS) monitoring [28][29][30] can also be implemented in this region if a higher temporal resolution of all three deformation components is required.…”

Section: Discussionmentioning

confidence: 99%

Estimation of Deformation Intensity above a Flooded Potash Mine Near Berezniki (Perm Krai, Russia) with SAR Interferometry

Samsonov

Baryakh

2020

Remote Sensing

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In this study we used RADARSAT-2 and Sentinel-1 Synthetic Aperture Radar data for measuring subsidence above a flooded potash mine, which is almost entirely located within the city of Berezniki (Perm Krai, Russia), population 150,000. This area has experienced very fast subsidence since October 2006 when the integrity of the Berezniki-1 mine was compromised, resulting in water intrusion, subsequent flooding and closure of the mine. Due to the ongoing dissolution of carnallite, subsidence in this region is expected to continue in the foreseeable future. In addition to rapid subsidence, at least five sinkholes have formed in the region, with the largest being 440 × 320 m. We observed ground subsidence during the period October 2011–April 2014 (RADARSAT-2) with a vertical rate up to 14 cm/year and horizontal rate up to 10 cm/year; during the period July 2016–June 2020 (Sentinel-1) with a vertical rate up to 17 cm/year. Our results were validated by precise leveling, with a coefficient of correlation of 0.75. Subsidence faster than 17 cm/year observed by precise leveling was not resolvable with Differential Interferometric Synthetic Aperture Radar (DInSAR). Our results show the complementary nature of ground-based and space-borne measurement techniques. The precise leveling captures subsidence along profile lines with high precision but lower temporal resolution, while DInSAR captures subsidence with high spatial and temporal resolutions but with lower precision. DInSAR is also significantly affected by decorrelation outside of urban areas. An important advantage of our methodology is the ability to measure the horizontal east component of the ground deformation when both, ascending and descending, data are available. This measurement directly characterizes the level of anthropogenic load on buildings and infrastructure. We recommend continuing monitoring subsidence using both measurement techniques, which can also be complemented by continuous Global Navigation Satellite System (GNSS).

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“…Literatür incelendiğinde, HNK yönteminin deformasyon belirleme çalışmalarında kullanılabilirliğinin yatay bileşende (2 boyutlu) incelendiği (Yiğit vd., 2016b;Aydin vd., 2019), sadece zemin çökmeleri çalışmalarında yükseklik bileşenin (tek boyutun) değerlendirildiği (Yalvac, 2020a), farklı atmosferik koşullar altında HNK yönteminden elde edilen yükseklik bilgisinin araştırıldığı (Rajner ve Liwosz, 2011) ve multi-GNSS çözümleriyle HNK yönteminden elde edilen zaman serilerinin karşılaştırıldığı çalışmalar olduğu görülmektedir (Yiğit vd., 2016a (Herring vd., 2010). Mutlak yöntemle yapılan analizler HNK yöntemi ile gerçekleştirilmiştir.…”

Section: Gnss (Global Navigationunclassified

Hassas Nokta Konumlama Yönteminin Kabuk Deformasyonu Belirleme Çalışmalarında Kullanılabilirliğinin Araştırılması

Yalvaç¹

2020

Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada, HNK (Hassas Nokta Konumlama) yönteminin kabuk deformasyonu belirleme çalışmalarında kullanılabilirliği, rölatif GNSS (Global Navigation Satellite System) analizleri eşliğinde araştırılmıştır. Bu amaçla, Kuzey Anadolu Fay (KAF) hattının kuzeyinde yer alan GIRS, SINP ve ZONG istasyonları ile söz konusu fay hattının güney kesiminde konumlanan RHIY, ANKR ve BILE TUSAGA-Aktif (Türkiye Ulusal Sabit GNSS Ağı-Aktif) istasyonlarının 2011-2018 (8 yıl) yılları arasındaki periyodik verileri elde edilerek analiz edilmiştir. Analizler, HNK yöntemi için CSRS PPP (Canadian Spatial Reference System Precise Point Positioning) çevrimiçi servisiyle, rölatif yöntem için ise GAMIT/GLOBK V10.7 akademik GNSS analiz yazılımı yardımıyla gerçekleştirilmiştir. Koordinat değerleri Kalman filtreleme tekniği yardımıyla analiz edilerek, her istasyona ait hız değerleri Avrasya plakasında konumlanan ORID IGS (International GNSS Service) istasyonu sabit olarak Kuzey, Doğu ve Yukarı bileşenler için ayrı ayrı kestirilmiştir. Her iki yöntemden elde edilen hız kestirim değerleri arasındaki farklardan hesaplanan üç boyutlu konum hatası değerlerinin 0.1 mm ile 2.4 mm seviyeleri arasında olduğu ve HNK yönteminin bilimsel kabuk deformasyonu belirleme çalışmalarında kullanılabileceği sonucuna varılmıştır.

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Validating InSAR-SBAS results by means of different GNSS analysis techniques in medium- and high-grade deformation areas

Cited by 38 publications

References 24 publications

Subsidence in Coastal Cities Throughout the World Observed by InSAR

Subsidence in Coastal Cities Throughout the World Observed by InSAR

Estimation of Deformation Intensity above a Flooded Potash Mine Near Berezniki (Perm Krai, Russia) with SAR Interferometry

Hassas Nokta Konumlama Yönteminin Kabuk Deformasyonu Belirleme Çalışmalarında Kullanılabilirliğinin Araştırılması

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