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5 Reports on Geodesy

5 2003

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The direct and indirect effects of the artificial lake water in the vicinity of the pumped - storage power station "Zarnowiec" on gravity and geoidal height

Barlik M.

Reports on Geodesy

2003

z. 4/67

53-65

In the paper the author focuses attention on the problem of the influence of lateral density changes in topographical masses on gravity and geoidal height computation. In computing the geoidal heights, the density is usuall modelled by the mean crust density p0=2670kg.m-3. The density of water in lakes differs significantly from this value. To answer the question of how large an error can be caused by this onfluence we divide it into primary, secondary and idirest effects. An estimation has been made for an artificial lake near the pumped-storage power station in Zarnowiec, Gdansk district.

Satellite and gravimetric methods for monitoring changes in hydrotechnical earth built structures

Pachuta A., Barlik M., Olszak T., Szpunar R., Walo J.

Reports on Geodesy

2003

z. 4/67

7-14

Gravimetric monitoring of hydrotechnic objects

Barlik M., Pachuta A., Olszak T.

Reports on Geodesy

2003

z. 4/67

201-206

Density decreasing inside a ground construction has an influence on the gravity obseived on the surface stations. The gravimetric monitoring contained the connection of investigated points on a hydrotechnic object to the outside located reference stations and permanent registration of gravity variations taking into account the solar and lunar tides. The basic problem in the interpretation of the results was the elimination of the variations of water level and its influence on gravity. A special software for this purpose was worked out. The paper presents a comparison of theoretical and observed gravity changes while maximum and minimum water level heights occurred.

Gravimetric investigations carried out on the hydro-technical object "Zarnowiec"

Olszak T., Pachuta A., Barlik M.

Reports on Geodesy

2003

z. 4/67

33-51

Automation of the static gravity meters calibration

Pachuta A.

Reports on Geodesy

2003

z. 4/67

75-82

Precise determination of the gravity meter coefficient ought to be performed to allow monitoring of the geodynamic monitoring of a hydro-technical construction. The capacity to automate coefficient determination by two methods is discussed in the paper. The first one is the method using gravity calibration base-lines. The second one is the tilt method which may be performed in laboratory conditions. The software CECH5 and GRAWKAL were prepared in the Institute of Geodesy and Geodetic Astronomy WUT operating on a PSION ORGANISER microcomputer for the automation of both calibration methods. This software provides, besides registration of readings, field data processing computation of tidal corrections, drift and altitude evaluation. Field experiments confirmed the efficiency of the procedures and the precision obtained.