Svet Milanovskiy | Institute of Physics of the Earth, Russian Academy of Sciences (original) (raw)
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Papers by Svet Milanovskiy
In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of ... more In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of hydraulic engineering units has been applied. Alongside field studies, numerical evaluation of permeable talik zone (thawing) origination and development in a broad zone around a dam was made. The non-steady problem of heat-mass transfer in fractured-porous saturated frozen media, intcrbedded in frozen impermeable strata is discussed. The model takes into consideration the main conditions causing initiation and development of talik near a reservoir: annual temperature and snow cover variation, seasonal water temperature distribution with depth in the storage basin adjacent to the dam, and evolution of permeability in rock due to thaw-freeze processes. The proposed model can be used to analyse more complex situations.
We present new heat flow values and other geothermal data in the upper crystalline crust in the i... more We present new heat flow values and other geothermal data in the upper crystalline crust in the immediate vicinity of the 12.4-km deep Kola super-deep borehole, NW Russia. Our results show a systematic vertical increase in geothermal gradient and heat flow density as deep as we could measure (1.6 km). Our results confirm earlier results on vertical heat flow trends of in the uppermost part of the Kola super-deep hole, and imply that the thermal regime is not in steady-state conductive conditions. In an area of 3-km  5-km measurements were performed in 1-2-km deep boreholes surrounding the Kola super-deep hole and on core samples from these holes. Temperature logs are available from 36 holes. Core data exists from 23 boreholes with a total length of 11.5 km at a vertical resolution of 10 m. We carried out a very detailed study on thermal conductivity with regard to anisotropy, inhomogeneity and temperature dependence. Tensor components of thermal conductivity were determined on 1375 core samples from 21 boreholes in 3400 measurements. Additionally, we measured specific heat capacity, heat generation rate, density, porosity, and permeability on selected subsets of core samples. Heat flow from 19 boreholes varies between 31 and 45 mW m À2 with an average value of 38 mW m À2 . In most boreholes the vertical heat flow profiles show a considerable variation with depth. This is consistent with observations in the upper part of the Kola super-deep borehole. We conclude that this variation is not caused by technical operations but reflects a natural process. It is considered to be due to a combination of advective, structural and paleoclimatic effects. Preliminary 3-D numerical modeling of heat and flow in the study area provides an indication of relative contributions of each of these factors: advective heat transfer turns out to have a major influence on the 0040-1951/$ -see front matter D (D. Mottaghy).
In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of ... more In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of hydraulic engineering units has been applied. Alongside field studies, numerical evaluation of permeable talik zone (thawing) origination and development in a broad zone around a dam was made. The non-steady problem of heat-mass transfer in fractured-porous saturated frozen media, interbedded in frozen impermeable strata is discussed. The model takes into consideration the main conditions causing initiation and development of talik near a reservoir: annual temperature and snow cover variation, seasonal water temperature distribution with depth in the storage basin adjacent to the dam, and evolution of permeability in rock due to thaw-freeze processes. The proposed model can be used to analyse more complex situations.
For the last two decades on a number of Hydro Units in Western Yakutia, we observe seepage proces... more For the last two decades on a number of Hydro Units in Western Yakutia, we observe seepage process compromising their secure. We present geophysical methods for verification of permafrost state near Sitikan and Vilyui Hydro Units. Complex includes electric, electromagnetic, ground penetrating radar, hydro location, thermal and radiowave (down-hole) measurements. Ground level and down-hole geophysical survey focused on detecting thawing zones (talik) in dam, its flank and tail-water zone. Long-term geophysical monitoring shows up spatialtemporal permafrost evolution and talik development in the flank shore of Sitikan dam. Detecting of inflow zone and seepage velocity performed for right-bank contiguity of Vilyui HPS-1. Alongside with field studies the numerical evaluations of conditions of originating permeable talik-zones (thawing) in a board zone of dam, was down. Numerically analyzed conditions causing origin and development of talik near reservoir: annual air temperatures, snow cover, annual water temperature in storage basin with depth, permeability evolution in frozen soil. Proposed model can be used for analyzing more complex situation.
In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of ... more In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of hydraulic engineering units has been applied. Alongside field studies, numerical evaluation of permeable talik zone (thawing) origination and development in a broad zone around a dam was made. The non-steady problem of heat-mass transfer in fractured-porous saturated frozen media, intcrbedded in frozen impermeable strata is discussed. The model takes into consideration the main conditions causing initiation and development of talik near a reservoir: annual temperature and snow cover variation, seasonal water temperature distribution with depth in the storage basin adjacent to the dam, and evolution of permeability in rock due to thaw-freeze processes. The proposed model can be used to analyse more complex situations.
We present new heat flow values and other geothermal data in the upper crystalline crust in the i... more We present new heat flow values and other geothermal data in the upper crystalline crust in the immediate vicinity of the 12.4-km deep Kola super-deep borehole, NW Russia. Our results show a systematic vertical increase in geothermal gradient and heat flow density as deep as we could measure (1.6 km). Our results confirm earlier results on vertical heat flow trends of in the uppermost part of the Kola super-deep hole, and imply that the thermal regime is not in steady-state conductive conditions. In an area of 3-km  5-km measurements were performed in 1-2-km deep boreholes surrounding the Kola super-deep hole and on core samples from these holes. Temperature logs are available from 36 holes. Core data exists from 23 boreholes with a total length of 11.5 km at a vertical resolution of 10 m. We carried out a very detailed study on thermal conductivity with regard to anisotropy, inhomogeneity and temperature dependence. Tensor components of thermal conductivity were determined on 1375 core samples from 21 boreholes in 3400 measurements. Additionally, we measured specific heat capacity, heat generation rate, density, porosity, and permeability on selected subsets of core samples. Heat flow from 19 boreholes varies between 31 and 45 mW m À2 with an average value of 38 mW m À2 . In most boreholes the vertical heat flow profiles show a considerable variation with depth. This is consistent with observations in the upper part of the Kola super-deep borehole. We conclude that this variation is not caused by technical operations but reflects a natural process. It is considered to be due to a combination of advective, structural and paleoclimatic effects. Preliminary 3-D numerical modeling of heat and flow in the study area provides an indication of relative contributions of each of these factors: advective heat transfer turns out to have a major influence on the 0040-1951/$ -see front matter D (D. Mottaghy).
In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of ... more In the territory of Western Yakutia, during the last 20 years, complex geophysical monitoring of hydraulic engineering units has been applied. Alongside field studies, numerical evaluation of permeable talik zone (thawing) origination and development in a broad zone around a dam was made. The non-steady problem of heat-mass transfer in fractured-porous saturated frozen media, interbedded in frozen impermeable strata is discussed. The model takes into consideration the main conditions causing initiation and development of talik near a reservoir: annual temperature and snow cover variation, seasonal water temperature distribution with depth in the storage basin adjacent to the dam, and evolution of permeability in rock due to thaw-freeze processes. The proposed model can be used to analyse more complex situations.
For the last two decades on a number of Hydro Units in Western Yakutia, we observe seepage proces... more For the last two decades on a number of Hydro Units in Western Yakutia, we observe seepage process compromising their secure. We present geophysical methods for verification of permafrost state near Sitikan and Vilyui Hydro Units. Complex includes electric, electromagnetic, ground penetrating radar, hydro location, thermal and radiowave (down-hole) measurements. Ground level and down-hole geophysical survey focused on detecting thawing zones (talik) in dam, its flank and tail-water zone. Long-term geophysical monitoring shows up spatialtemporal permafrost evolution and talik development in the flank shore of Sitikan dam. Detecting of inflow zone and seepage velocity performed for right-bank contiguity of Vilyui HPS-1. Alongside with field studies the numerical evaluations of conditions of originating permeable talik-zones (thawing) in a board zone of dam, was down. Numerically analyzed conditions causing origin and development of talik near reservoir: annual air temperatures, snow cover, annual water temperature in storage basin with depth, permeability evolution in frozen soil. Proposed model can be used for analyzing more complex situation.