Deformation Monitoring by GPS at Embankment Dams and Deformation Analysis

Gökalp, Ertan; Tasci, L.

doi:10.1179/003962608x390021

Cited by 31 publications

(17 citation statements)

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“…Meanwhile, not like the traditional GNSS multiantenna technology, the dual-channel RF front-end and digital correlator share the same clock module, avoiding cycle slip error and realizing singleepoch positioning, owing to electronic component reduction of clock-synchronized dual-antenna receivers, the newgeneration N71JN from Shanghai Huace Navigation Technology Ltd. in Figure 1, which has low cost (<$1565) and light (<3.6 kg). Moreover, most of the dam GNSS surface monitoring schemes are unreasonable, and GNSS monitoring station overabundance results in tremendous waste of equipment resources [4,6,10,12,14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

et al. 2018

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Higher monitoring cost is the main limiting factor in the application of geodetic receivers in dam deformation monitoring, as the number of receivers applied in one dam is always too large. In this paper, an improved GNSS monitoring scheme is proposed. Firstly, three-dimensional finite element model is built to simulate the main deformation part of the dam, and only one clocksynchronized dual-antenna receiver is used to set the reference and monitoring stations; then, the dam displacement warning standard is determined based on the relationship between the corresponding surface displacement and safety factor of the different mechanical parameter combination; finally, through BDS/GPS dam deformation monitoring system for Lijiaxia in China, the operating status of dam is evaluated. Through comparative analysis, it is found that the scheme is feasible.

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Section: Introductionmentioning

confidence: 99%

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

et al. 2018

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“…In the IWST method, the objective function is the L 1 -norm of vector d, i.e., (Chen 1983;Chen et al 1990;Setan and Singh 2001;Setan and Othman 2006;Gökalp and Tasçi 2009). The optimization problem of the IWST method has the following form , (9) where…”

Section: 2mentioning

confidence: 99%

“…The obtained displacement vectors of single points are assessed statistically for significance. The best-known methods from this group include the iterative weighted similarity transformation (IWST) method, which fulfills the condition of the minimum sum of absolute component values of displacement vectors (Chen 1983;Chen et al 1990;Setan and Singh 2001;Setan and Othman 2006;Gökalp and Tasçi 2009) and the least absolute sum (LAS) method, which fulfills the condition of the minimum sum of length values of displacement vectors (Caspary 1984;Caspary and Borutta 1987;Caspary et al 1990;Setan and Singh 2001). Proposals for the use of other optimization conditions, e.g., the minimum objective function of the Huber method or the Danish method, can also be found in literature (Caspary and Borutta 1987).…”

Section: Introductionmentioning

confidence: 99%

“…Displacement vectors are computed on the basis of S-transformation of differences in adjusted coordinates of these points with the optimization condition of the LS method or on the basis of differences in coordinates obtained from free adjustments by the LS method. Although many more other new methods for deformation analysis, e.g., robust method based on M split estimation (Wiśniewski 2009;Duchnowski and Wiśniewski 2012) or R estimation (Duchnowski 2010(Duchnowski , 2013 or the non-robust Fredericton approach (Gökalp and Tasçi 2009), can be found in literature, this paper is limited to the presentation of only the most common solutions.…”

Section: Introductionmentioning

confidence: 99%

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Robust estimation of deformation from observation differences for free control networks

Nowel

Kamiński

2014

J Geod

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Deformation measurements have a repeatable nature. This means that deformation measurements are performed often with the same equipment, methods, geometric conditions and in a similar environment in epochs 1 and 2 (e.g., a fully automated, continuous control measurements). It is, therefore, reasonable to assume that the results of deformation measurements can be distorted by both random errors and by some non-random errors, which are constant in both epochs. In other words, there is a high probability that the difference in the accuracy and precision of measurement of the same geometric element of the network in both epochs has a constant value and sign. The constant errors are understood, but the manifestation of these errors is difficult to determine in practice. For free control networks (the group of potential reference points in absolute control networks or the group of potential stable points in relative networks), the results of deformation measurements are most often processed using robust methods. Classical robust methods do not completely eliminate the effect of constant errors. This paper proposes a new robust alternative method called REDOD. The performed tests showed that if the results of deformation measurements were additionally distorted by constant errors, the REDOD method completely eliminated their effect from deformation analysis results. If the results of deformation measurements are only distorted by random errors, the REDOD method yields very similar deformation analysis results as the classical IWST method. The numerical tests were preceded by a theoretical part. The theoretical part K. Nowel (B) · W. Kamiński Institute of Geodesy, University of Warmia and Mazury in Olsztyn, 1 Oczapowskiego Str., 10-719 Olsztyn, Poland e-mail: krzysztof.nowel@uwm.edu.pl W. Kamiński e-mail: waldemar.kaminski@uwm.edu.pl describes the algorithm of classical robust methods. Particular attention was paid to the IWST method. In relation to classical robust methods, the optimization problem of the new REDOD method was formulated and the algorithm for its solution was derived.

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“…The type of receiver and modes of data acquisition and processing depend on the characteristics of the process to be monitored [5]. In the control of rapid movements, for example, one can use network real-time kinematic networks (NRTK), in which the single monitoring point is a permanent GNSS station that receives a stream of data from the processing centre, which allows correction of the position of the monitored site in real-time.…”

Section: Introductionmentioning

confidence: 99%

Motorised digital levels: development and applications

et al. 2013

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A low-cost motorisation of the Leica DNA03 digital level was designed to enable the automatic monitoring of deformations without compromising its manual use in levelling. The upgrade of the instrument and its electronic control system are described together with laboratory tests carried out to study the effects of ambient temperature on the level. A simple model for the correction of measurements as a function of the temperature is proposed. The detection of vertical movements with sub-millimetre accuracy was obtained in a simulated permanent monitoring system. The operational advantages of the instrument are shown in a field test. Despite the encouraging results, research is still needed to find a reliable model for the correction of the staff readings under changing temperature conditions.

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Deformation Monitoring by GPS at Embankment Dams and Deformation Analysis

Cited by 31 publications

References 1 publication

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

Robust estimation of deformation from observation differences for free control networks

Motorised digital levels: development and applications

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