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    Wyświetlanie 1-4 z 4
    Tytuł:
    Establishing the Vertical Movement Map of Cuu Long Delta River by GNSS Data
    Autorzy:
    Nguyen, Gia Trong
    Nguyen, Viet Nghia
    Ly, Lam Ha
    Vu, Trung Dung
    Nguyen, Quoc Long
    Kim, Thi Thu Huong
    Pham, Ngoc Quang
    Nguyen, Viet Quan
    Powiązania:
    https://bibliotekanauki.pl/articles/27323240.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    land subsidence
    GNSS
    vertical crustal deformation
    Mekong delta
    deformacje
    delta Mekongu
    Opis:
    Mekong Delta is an area with an important position in the socio-economic development of Vietnam. However, due to the impact of climate change as well as of the construction of hydroelectric dams in the upstream of the Mekong River in recent years, saline intrusion and flooding have been occurred because of high tide. According to published researches, the Mekong Delta is being experienced surface subsidence with a rate of up to centimeters per year, that exacerbates the impact of saline intrusion and flooding. Thus, studying to establish the surface subsidence map is an urgent need in this site. There are many of technologies to create the vertical movement map such as: Levelling, INSAR, GNSS, etc. Up to now, there are no scientific reports on the application of GNSS to monitor the vertical movement in this area. In this paper, the authors have calculated the largest vertical displacement velocity up to 3cm/year based on processing GNSS observations of nearly 20 GNSS monitoring station in the area using Bernese software. From these results, the research team has made the vertical movement map of Mekong, Vietnam.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 173--177
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General Geometric Model of GNSS Position Time Series for Crustal Deformation Studies – A Case Study of CORS Stations in Vietnam
    Autorzy:
    Tran, Dinh Trong
    Nguyen, Quoc Long
    Nguyen, Dinh Huy
    Powiązania:
    https://bibliotekanauki.pl/articles/2019404.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    geometric model
    GNSS position time series
    crustal deformation
    CORS stations
    Vietnam
    model geometryczny
    GNSS
    Wietnam
    Opis:
    In processing of position time series of crustal deformation monitoring stations by continuous GNSS station, it is very important to determine the motion model to accurately determine the displacement velocity and other movements in the time series. This paper proposes (1) the general geometric model for analyzing GNSS position time series, including common phenomena such as linear trend, seasonal term, jumps, and post-seismic deformation; and (2) the approach for directly estimating time decay of postseismic deformations from GNSS position time series, which normally is determined based on seismic models or the physical process seismicity, etc. This model and approach are tested by synthetic position time series, of which the calculation results show that the estimated parameters are equal to the given parameters. In addition they were also used to process the real data which is GNSS position time series of 4 CORS stations in Vietnam, then the estimated velocity of these stations: DANA (n, e, u = -9.5, 31.5, 1.5 mm/year), HCMC (n, e, u = -9.5, 26.2, 1.9 mm/year), NADI (n, e, u = -10.6, 31.5, -13.4 mm/year), and NAVI (n, e, u = -13.9, 32.8, -1.1 mm/year) is similar to previous studies.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 183--197
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of continental hydrosphere loading using GNSS measurements
    Autorzy:
    Zygmunt, M.
    Rajner, M.
    Liwosz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/106899.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    load Love numbers
    Green's functions
    WGHM
    GNSS
    crustal deformation
    liczby Love'a
    parametry sprężystości Ziemi
    funkcja Greena
    deformacja skorupy
    Opis:
    Presented paper is dedicated to problems of deformation of the Earth's crust as a response to the surface loading caused by continental waters. The aim of this study was to specify areas particularly vulnerable to studied deformation and to compare calculated and observed displacements. Information of the continental water volume was taken from the WaterGAP Global Hydrological Model. Calculated values of the deformations were verified with the results obtained with programs SPOTL and grat. Vertical deformations were almost 10 times higher than the deformation in the horizontal plane, for which reason later part of the paper focuses on the former. In order to check agreement of the calculated and observed deformation 23 stations of International GNSS Service (IGS) were selected and divided into three groups (inland, near the shoreline and islands). Before comparison outliers and discontinuities were removed from GNSS observations. Modelled and observed signals were centred. The analysed time series of the vertical displacements showed that only for the inland stations it is possible to effectively remove displacements caused by mass transfer in the hydrosphere. For stations located in the coastal regions or islands, it is necessary to consider additional movement effects resulting from indirect ocean tidal loading or atmosphere loading.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2016, 101; 36-53
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinematics of reference height network on the territory of Rivne NPP
    Autorzy:
    Tretyak, K.
    Petrov, S.
    Bokhonko, S.
    Babiy, L.
    Shpakivskyy, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/106824.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    deformation
    stability of fixed reference points
    network kinematics
    crustal movements
    optimal oscillation period
    annual rate of displacement
    deformacja
    stabilność stałych punktów odniesienia
    kinematyka sieciowa
    ruchy skorupy ziemskiej
    optymalny okres drgań
    roczne tempo przemieszczenia
    Opis:
    Rivne Nuclear Power Plant (NPP) is located in western Ukraine. Construction of the station began in 1976. Totally four power generating units are operating on the station. Complicated geological conditions and display of man-made karst led to the need for monitoring of sediments and deformations on Rivne NPP. Since 1984 on the Rivne NPP there were conducted geodetic observations on the conditions of height reference network consisting of nine deep fixed reference points, which are installed in basaltic rocks. Totally 110 cycles of observations were conducted. The heights of fixed reference points were determined by leveling of I-st class. It is necessary to assess the kinematics of the reference height network and implement zoning of station territory according to a speed of inclination of the earth's surface. An average annual rates of displacement which appear as a linear trend weredetermined on the results of measurements for each fixed reference point by the least squares method. Excluding these values the vertical displacements of fixed reference points were derived and only the periodic component that is changing according to the periodic law remained present there. For each fixed reference point it was determined amplitude and optimum oscillation period and the coefficients of regression equations. Using the annual velocity of displacement of fixed reference points it was done the zoning of the Rivne NPP. There were allocated areas, which were characterized by different rates of inclinations and frequency of oscillations.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2014, 96; 55-66
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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