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Real time monitoring for analysis of dam stability:Potential of nonlinear elasticity and nonlinear dynamics approaches

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Frontiers of Structural and Civil Engineering 2013年第2期7卷 188-205页

作者： t.chelidze t.MAtCHARASHVILI V.ABASHIDZE M.KALABEGISHVILI N.ZHUKOVA M.Nodia Institute of Geophysics Ivane Javakhishvili Tbilisi State UniversityTbilisi 0218Georgia European Centre on Geodynamical Hazards of High Dams 1 Alexidze str.Tbilisi 0171Georgia Georgian technical University Tbilisi 0171Georgia

Large dams are complex structures with nonlinear dynamic *** often are forced to assess dam safety based on the available incomplete data,which is extremely *** important problem can be solved with the modern theory of complex *** is possible to derive characteristics of the whole unknown dynamics of a structure using few data sets of certain carefully selected representative parameter(s).By means of high quality continuous records of some geotechnical characteristic(s)of a dam and modern methods of time series linear/nonlinear analysis the main dynamical features of the entire,unknown process(here—dam deformation)can be *** created the cost-effective Monitoring telemetric System for Dam Diagnostics(DAMWAtCH),which consists of sensors(tiltmeters),terminal and central controllers connected by the GSM/GPRS Modem to the diagnostic *** tilt data recorded for varying reservoir level are compared with static design model of dam deformations computed by a finite element method(FEM)for the dam-reservoir-foundation ***,recently developed linear/nonlinear data analysis and prediction schemes may help to quantify fine dynamical features of the dam *** software package DAMtOOL has been developed for this *** differences between measured and theoretically predicted response parameters of the dam may signal abnormal behavior of the *** data obtained already by testing of the DAMWAtCH/DAMtOOL system during operation of the high Enguri arc dam and reservoir(Georgia)show interesting long-term and short-term patterns of tilts in the dam body,which can be used for dam *** proposed real-time telemetric monitoring(DAMWAtCH)complex and linear/nonlinear dynamical analysis system(DAMtOOL)are unique.

关键词： real time monitoring telemetry dam tilts diagnostic tools hysteresis nonlinear dynamics

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Geophysical Reactions to Remote 2022 tonga Eruption and to türkiye Earthquakes in Georgia (Caucasus): Hydrogeology, Geomagnetics and Seismicity

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Open Journal of Earthquake Research 2023年第4期12卷 223-237页

作者： tamaz chelidze George Melikadze Genady Kobzev tamar Jimsheladze Nadezhda Dovgal M. Nodia Institute of Geophysics Tbilisi State University Tbilisi Georgia

the paper is devoted to analysis of hydrogeological, geomagnetic and seismic response to the two great remote geophysical events, 2022 tonga volcano eruption and 2020-2023 türkiye earthquakes in Georgia (Caucasus). the geophysical observation system in Georgia, namely, water level stations in the network of deep wells, atmospheric pressure and the geomagnetic sensors of the Dusheti Geophysical Observatory (DGO) as well as seismic data in Garni Observatory (Armenia) respond to the tonga event by anomalies in the time series. these data show that there are two types of respond: infrasound disturbances in atmospheric pressure and seismic waves in the Earth generated by the eruption. After tonga eruption January 15 at 04:21 UtC three groups of N-shaped waveforms were registered in the water level corresponding to the global propagation characteristics of the N-shaped waveform of infrasound signals on the barograms generated by eruption at the distance ~15,700 km: they were identified as the Lamb wave, a surface wave package running in the atmosphere with a velocity around ~314 m/s. the paper also presents the WL reactions to three strong EQs that occur in türkiye 2020-2023, namely Elazığ, Van and türkiye-Syria EQs. WL in Georgian well network reacts to these events by anomalies of different intensity, which points to the high sensitivity of hydrosphere to remote (several hundred km) strong EQs. the intensity and character of WL reactions depend strongly on the local hydrogeological properties of rocks, surrounding the well.

关键词： 2022 tonga Eruption türkiye Earthquakes Hydrogeological Geomagnetic and Seismic Reactions in Georgia

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