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Crustal deformation monitoring around the High and old Aswan dams, Egypt
Abstract Many countries are using GPS for monitoring large engineering structures such as dams. Monitoring deformation pattern is often one of the most effective ways to be informed the safety status of such structures. Thus, the safety control of dams lies on the analysis of its structural behaviour, based on monitoring a large set of variables, which contains information about earthquakes, crustal movement, temperature variations etc. and about corresponding stresses. For the purpose of monitoring the deformations of the High and old Aswan dams, a number of methods have been developed. For monitoring the height changes along the High Dam body, eight levelling lines were established at different levels during its construction. The levelling measurements were carried out each month since 1970 and continue till present. Mohamed et al. (2003) have presented and analysed the levelling measurements from 1970 to 2000. The results reveal different trends for different levels of the High Dam body. The rates of setting of the High Dam body tend to be stable. During the last five years the rates of the subsidence range 1–2 mm/a at most benchmarks of the levelling lines along the High Dam body. During the last decade no significant correlation has been found between the rates of setting and the water level changes at the up- and down-stream sides. For monitoring crustal deformations at the High and old Aswan dams region, a local GPS network consisting of 9 geodetic points was established. Three campaigns from December 2001 to April 2003 were performed. The study results indicate a definite correlation between the amount of water in the lake and the deformation in the area. The reservoir pushes the land towards the north where the two dams are. The paper throws light upon the present state of the crustal deformations in the study area.
Crustal deformation monitoring around the High and old Aswan dams, Egypt
Abstract Many countries are using GPS for monitoring large engineering structures such as dams. Monitoring deformation pattern is often one of the most effective ways to be informed the safety status of such structures. Thus, the safety control of dams lies on the analysis of its structural behaviour, based on monitoring a large set of variables, which contains information about earthquakes, crustal movement, temperature variations etc. and about corresponding stresses. For the purpose of monitoring the deformations of the High and old Aswan dams, a number of methods have been developed. For monitoring the height changes along the High Dam body, eight levelling lines were established at different levels during its construction. The levelling measurements were carried out each month since 1970 and continue till present. Mohamed et al. (2003) have presented and analysed the levelling measurements from 1970 to 2000. The results reveal different trends for different levels of the High Dam body. The rates of setting of the High Dam body tend to be stable. During the last five years the rates of the subsidence range 1–2 mm/a at most benchmarks of the levelling lines along the High Dam body. During the last decade no significant correlation has been found between the rates of setting and the water level changes at the up- and down-stream sides. For monitoring crustal deformations at the High and old Aswan dams region, a local GPS network consisting of 9 geodetic points was established. Three campaigns from December 2001 to April 2003 were performed. The study results indicate a definite correlation between the amount of water in the lake and the deformation in the area. The reservoir pushes the land towards the north where the two dams are. The paper throws light upon the present state of the crustal deformations in the study area.
Crustal deformation monitoring around the High and old Aswan dams, Egypt
Mohamed, Abdel-Monem S. (Autor:in)
2005
Aufsatz (Zeitschrift)
Englisch
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