Complex high accuracy satellite and field measurements of horizontal and vertical displacements of control geodetic network on Dniester hydroelectric pumped power station (HPPS).

Tretyak, K.; PERIY, S.; Sidorov, Ihor; Babiy, Lyubov

doi:10.7494/geom.2015.9.1.83

Cited by 10 publications

(3 citation statements)

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“…The analysis of the results of the observations indicated the possible presence of cyclic seasonal displacements of the crest of the Dnieper Hydroelectric Station dam. Studying these movements and accumulating relevant data requires constant monitoring of various physical indicators and different geodetic measurements (Tretyak et al, 2015). At the Dnieper Hydroelectric Station, in 2015, Leica Geosystems installed a stationary system for monitoring the spatial displacements of buildings, which led to a significant increase in efficiency and automation of data acquisition.…”

Section: Introductionmentioning

confidence: 99%

Research of the environmental temperature influence on the horizontal displacements of the Dnieper hydroelectric station dam (according to GNSS measurements)

Tretyak

Palianytsia

2022

Reports on Geodesy and Geoinformatics

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The paper studies the relationship between the ambient temperature change and the horizontal displacements on control points of the Dnieper Hydroelectric Station dam from 2016 to 2020. A specially developed software product analyzed the GNSS time series of measurements pre-processed by the GeoMoS system to determine the parameters of seasonal displacements and their relationship with seasonal changes in air temperature. The research established that the influence of ambient temperature in the absence of significant changes in the water level in the upper reservoir determines the cyclicity of dam deformations. It is established that the projections of velocity vectors of reference points in the ETRF-2014 system for the studied period do not exceed the absolute value of 3 mm/month. The directions of the horizontal displacement vectors in the first half of each year are opposite to the directions recorded in the second half. In the first half of the year, the dam’s body shifts towards the reservoir, while in the second half year period, it shifts-backwards. According to the three-year GNSS monitoring of the Dnieper Hydroelectric Station dam, the amplitude of semi-annual horizontal oscillations of the control points relative to the dam axis is from -9.5 to +8 mm. In winter and summer, the horizontal displacements increase from the edges of the dam to its central part, and the amplitudes of the horizontal displacements move vice versa. The obtained data establish a linear analytical relationship between the average temperature and the horizontal displacements of the GNSS control points.

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Section: Introductionmentioning

confidence: 99%

Research of the environmental temperature influence on the horizontal displacements of the Dnieper hydroelectric station dam (according to GNSS measurements)

Tretyak

Palianytsia

2022

Reports on Geodesy and Geoinformatics

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“…Thenceforth, various physical indicators are constantly monitored, and different geodetic measurements are carried out to control the condition of the hydraulic structure. [Tretyak, et al, 2015]. Since 2015, the Dnipro HPP has been operating a stationary system for monitoring the spatial displacement of buildings.…”

Section: Introductionmentioning

confidence: 99%

Geodynamics

Tretyak¹,

Palianytsia²

2021

JGD

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The goal. Identify the relationship between seasonal temperature changes and vertical and horizontal displacements of GNSS control points based on data obtained by the automated monitoring system of the Dnipro HPP dam in the period from 2016 to 2020. Input data. The research used data of uninterrupted GNSS measurements obtained at 16 points of the Dnipro HPP dam from mid-2016 to mid-2020. Method. A specially developed software product analyzes the GNSS time series of measurements pre-processed by the GeoMoS system to determine the parameters of seasonal displacements and their relationship with seasonal changes in air temperature. The GNSS time series analysis. Based on the conducted research, the influence of environmental temperature has a decisive effect on the cyclicity of dam deformations. This applies to both horizontal and vertical displacements but in the absence of significant changes in the water level in the upper reservoir. Values of extreme displacements increase closer to the middle of the dam and decrease at the edges. This tendency is observed every year in the study period. According to the three-year GNSS dam monitoring, the amplitude of semi-annual horizontal oscillations of the control points relative to the dam axis is in the range of 15-18 mm. Almost all vectors of horizontal displacements are perpendicular to the axis of the arcuate dam. In the first half of the year, the vectors of horizontal displacements aim to widen the dam, and in the second half of the year - at compressing the dam. The analysis of the data represents that almost every year, extreme deviations, both horizontal and vertical, occur in February and August. Temperature extremes occur faster than excessive GNSS displacements. For the dam of the Dnipro HPP, the extreme horizontal displacements lag on average by 37 days, and the vertical ones - by 32 days from the extreme temperatures. The deformations of the dam are related to the concrete structure temperature, which changes with a certain delay relative to the air temperature. The magnitudes of extreme displacements and the epoch of their manifestation depend on the dam's design and its technical parameters. For each dam, these extreme displacements and the periods of their representation will be different. Accordingly, monitoring these displacements and their changes over time is one of the criteria for assessing the general condition of the dam. Scientific novelty and practical significance. The regularities of the connection between the change of temperature and the displacements of the GNSS points, revealed during the research, can be used for the further study of data processing and analysis of the hydraulic structures monitoring.

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“…The order 2/3 of h m gives the best results of balancing; it can be explained by the systematic effect of the vertical refraction in the observation triangles (Tretyak, 2015).…”

Section: Fig 7 Location Of the Observation Points And Their Elevatimentioning

confidence: 99%

Geodesy, Cartography and Aerial Photography

Perij¹,

Pokotylo²,

Korliatovych³

2017

ГЕОДЕЗІЯ, КАРТОГРАФІЯ І АЕРОФОТОЗНІМАННЯ

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Aims. The investigations of the transmission of elevations over water surfaces remain topical, so the first aim is to develop the technique of increasing the accuracy of the trigonometric instead of geometrical one. The second aim is to investigate the methods of trigonometric which can be used for the transmission of elevations over water surfaces with the use of modern devices. Methodology. Simultaneous and non-simultaneous reciprocal observations over different water surfaces have been carried out. The results of the trigonometric leveling carried out by different methods have been processed. Results. On the territories of training geodetic site in Berezhany city (Ternopil region) and urban settlement Shatsk (Volyn' region) the activities directed to the creation of elevation geodetic base have taken place, including the investigations of the accuracy of trigonometric leveling during the transmission of elevation over the water surfaces. Vertical tie-in of geodetic datum has been done by the III class geometrical leveling. For determining heights on the investigated points, linear and angular measurements have been made with the use of automated tachymeters TPS 1201R Leica and TC 2003 Leica. According to the results of the observations on the geodetic site in urban settlement Shatsk, the comparison of the elevations obtained by the geometric leveling and trigonometric leveling by the methods "from inside", "across the point", "refraction basis" and non-simultaneous reciprocal leveling has been conducted. Balancing of the analytical network by a method of least squares has been done. According to the results obtained in Berezhany, the coefficients of vertical refraction along different directions have been computed and the comparison of elevations obtained from the III class geometric leveling and from the trigonometric leveling done by the method "from inside" have been conducted. The investigations of the accuracy of different methods of trigonometric leveling compared to III class geometric leveling have shown that they both generally meet the accuracy requirements of leveling on the flat grounds. Since the rough terrain has its peculiarities, some additional measured characteristics of the propagation of the axis of sight over different surfaces should be taken into account, for example, fluctuations of zenith distances determining atmosphere stratification or measured elevations. Scientific novelty. The application of non-simultaneous reciprocal trigonometric leveling over the water surfaces instead the III class geometric leveling on the paths under 1 km in length. Practical applicability. The possibility of replacing the cost-based geometric leveling with the trigonometric leveling without accuracy losses during the transmission of elevations over the water surfaces is shown.

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Complex high accuracy satellite and field measurements of horizontal and vertical displacements of control geodetic network on Dniester hydroelectric pumped power station (HPPS).

Cited by 10 publications

References 0 publications

Research of the environmental temperature influence on the horizontal displacements of the Dnieper hydroelectric station dam (according to GNSS measurements)

Research of the environmental temperature influence on the horizontal displacements of the Dnieper hydroelectric station dam (according to GNSS measurements)

Geodynamics

Geodesy, Cartography and Aerial Photography

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