Results of dipole electric sounding in the area of the Chirkey water reservoir after its filling |
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| Authors: | Sh G Idarmachev S S Arefiev |
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| Institution: | 1.Institute of Geology, Dagestan Scientific Center,Russian Academy of Sciences,Makhachkala,Russia;2.Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The analysis of the data of variations of the apparent electric resistivity of rocks (AR) in the area of the Chirkey HES has
been carried out for the period after the water reservoir was filled. For measurements the method of dipole electric sounding
has been used with location of potential dipoles around the water reservoir with a distance between them of 5.2–11.3km. The
analysis of the data obtained for the period of observations (1976–1988) has shown that the filling of the water reservoir
affected the environment for a long time. After it was filled (1975), at different observation points located around the water
reservoir a decrease of 1.6–2.4 times was registered in the AR over the period from 1976–1988. This is connected with the
process of inundation of the rock mass, which continued for more than 14 years. The process of water filtering into the surrounding
rock mass was complicated; that is, it varied in time and space. At the initial stage of the reservoir filling the AR variations
of a high amplitude (30–40%) were observed. These variations are considered to be connected with the seismic regime of the
area of the water reservoir. A synchronous decrease in the AR, registered at the receiver points was followed by an increase
of the number of the earthquakes of energetic class (K = 10). The given anomalous data are connected by an increase in the water filtration into fractured zones, whose filtration
features change on being affected by tectonic stresses. |
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