Simultaneous estimation of dam displacements and reservoir level variation from GPS measurements

Xi, Rui; Zhou, Xiaohui; Jiang, Weiping; Chen, Qusen

doi:10.1016/j.measurement.2018.03.036

Cited by 39 publications

(14 citation statements)

References 25 publications

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“…According to these authors, using a low-cost GPS receiver and analyzing its data with free and open source software, movements of the order of a few millimeters can be detected. According to Xi et al (2018), GPS technology has been widely applied to monitor displacements using direct measurements. In conventional forms of direct measurement, the displacement can achieve precision at the millimeter level: better than 1 mm horizontally and 2 mm in the vertical component (Xi et al, 2018).…”

Section: Geodetic Measurementsmentioning

confidence: 99%

“…According to Xi et al (2018), GPS technology has been widely applied to monitor displacements using direct measurements. In conventional forms of direct measurement, the displacement can achieve precision at the millimeter level: better than 1 mm horizontally and 2 mm in the vertical component (Xi et al, 2018). Scaioni et al (2018) performed a review of geodetic and remote sensing techniques applied in studies of dam deformation monitoring.…”

Section: Geodetic Measurementsmentioning

confidence: 99%

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Technical and scientific aspects of dams in Brazil: a theoretical approach

Pacheco¹,

Henriques²,

Ribeiro³

2020

Rev. ambiente água

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The safety of a dam is the result of a series of factors, including structural, geotechnical, hydraulic, operational and environmental aspects. In Brazil, Law No. 12.334 of September 2010 establishes the National Dam Safety Policy, which requires safety reports and monitoring inspections for existing dams. The inspection comprises a set of devices installed on the dam, which are used to assess the structural behavior based on performance parameters of the structure, such as displacements, flows, stresses, slopes and others. Dam auscultation procedures, historically, have been performed since the 1950s. Since then, there have been significant advances in instrumentation and dam auscultation methods. This work presents a theoretical approach on technical and scientific aspects of dams in Brazil, based on a state-of-the-art literature review, involving auscultation of dams in the context of design codes, concepts, instrumentation, safety, procedures and monitoring methods.

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Section: Geodetic Measurementsmentioning

confidence: 99%

Section: Geodetic Measurementsmentioning

confidence: 99%

Technical and scientific aspects of dams in Brazil: a theoretical approach

Pacheco¹,

Henriques²,

Ribeiro³

2020

Rev. ambiente água

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“…The methodology of the GNSS-Interferometric Reflectometry (GNSS-IR) was first introduced by Martin-Neira (1993) to perform ocean altimetry for retrieving the height of the ocean over a reference ellipsoid. After that, in many studies related to the estimation of the snowpack (Larson et al 2009;Ozeki & Heki 2012;Gutmann et al 2012;Chen et al 2014;Jin et al 2016;Tunalioglu et al, 2019), soil moisture (Larson et al 2008;Larson et al, 2010;Roussel et al 2016;Zhang et al 2017;Han et al 2020;Altuntas & Tunalioglu, 2020a), sea-level tide (Anderson 2000;Xi et al 2018), deformation monitoring (Yang et al 2019), etc., the GNSS-IR methodology has been implemented successfully.…”

Section: Introductionmentioning

confidence: 99%

Retrieving the SNR metrics with different antenna configurations for GNSS-IR

Altuntaş

Tunalıoğlu

2022

Turkish Journal of Engineering

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Signal-to-noise ratio (SNR) GNSS Interferometric Reflectometry (GNSS-IR) Smartphone Horizon-looking antenna Multipath, which is a major source of error for precise positioning, is the effect that occurs when Global Navigation Satellite Systems (GNSS) signals reach the receiver by reflecting from one or more surfaces. Reflected signals affect the signal-to-noise ratio (SNR) data provided by the receiver, indicating the signal strength. The structure of the antenna of the receiver and the direction in which it is oriented also change the strength of the received signal. In this study, the effect of antenna orientation and polarization on SNR data was demonstrated by using the method called GNSS-Interferometric Reflectometry (GNSS-IR), in terms of reflector height estimates. A geodetic GNSS receiver (CHC i50) and two different smartphones (Xiaomi Mi8 and Xiaomi Mi8 Lite) were used in the four-day experiments. The geodetic receiver was established as zenith-looking (ZL) in the first two days and as horizon-looking (HL) in the last two days. Smartphones were placed on the same mast with the HL receiver in the last two days. It was seen that it is more appropriate to use a 0°-60° satellite elevation angle range in the common use of all receivers' data. In the 30°-60° range where the ZL installation receives the multipath signals weakly, it has been found that the HL receiver and smartphones have reflector height estimation accuracies with values ranging from 1.9 cm to 2.5 cm. In short, for different elevation angle ranges, accuracies below 2 cm could be obtained with each receiver. Thus, different antenna configurations may be used in GNSS-IR studies, depending on the characteristics of the study area and the surface feature to be determined.

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“…There are different factors that could cause the destruction of the arch dams, including its self-weight, hydrostatic pressure on the upstream surface, internal temperature changes etc. Over the years, several studies have been conducted to monitor the behaviour of dams (Tarchi et al 1999;Manake and Kulkarni 2002;Pytharouli and Stiros 2005;De Sortis and Paoliani 2007;Mascolo et al 2014;Talich 2016;Saidi et al 2017;Di Pasquale et al 2018;Xi et al 2018;Yavaşo glu et al 2018;Xiao et al 2019). For example, Guler et al (2006) investigated the horizontal and vertical surface movements on the Alibey Dam using geodetic and non-geodetic techniques.…”

Section: Introductionmentioning

confidence: 99%