Scientific and methodological foundations to develop numerical hydrodynamical models of mine fields in Donbas

Zahrytsenko, Аlina; Podvigina, Olena; Dereviahina, Nataliia

doi:10.1051/e3sconf/20186000034

Cited by 4 publications

(3 citation statements)

References 5 publications

(5 reference statements)

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“…The most comprehensive review of the hydrogeological modelling methods in terms of mine flooding conditions is represented in [5], [6]. The publication [7] covers environmental issues dealing with the assessment of the effects of mine working floodingsubsidence and water environment pollution.…”

Section: Analysis Of the Recent Studies And Publicationsmentioning

confidence: 99%

Risk assessment of radionuclide contamination spreading while flooding coal mined-out rocks

Sadovenko¹,

Ulytsky²,

Zahrytsenko³

et al. 2020

Min. miner. depos.

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To investigate pathways and concentrations of the most dangerous radionuclides entering the surface and groundwater in terms of hydrodynamic situation re-establishment in the zone of radiation-hazardous mine field objects in the southern wing of the Central Donbas coal industrial region for environmental assessment. Methods. Hydrodynamics and migration parameters characterizing the stage of mine workings' floodinghave been investigated. This phase is marked by the establishment of steady-state hydrodynamic regime with laminar groundwater filtration and radionuclide migration from the source of pollution to the river drainage. The parameters have been estimated on the basis of numerical modelling of geofiltration using available data from similar research and experimental studies. The resulting model has been calibrated by assessing the components of the water balance within the drainage area of the territory under research. Radionuclide migration pathways are defined by mathematical tools for mass-transfer calculation (MODPATH) using input parameters of the geofiltration model. To determine the concentration value of radionuclides entering the river drainage through the groundwater discharge, analytic calculations have been carried out. Facts and previous assumptions from different sources have been subjected to analytical comparison in order to outline the measures for control and technical settlement of possible threats and their ongoing assessment. Findings. Predictive modelling of the initial phase of hydrodynamic regime stabilization during mine working flooding has been performed. Possible concentrations of Sr 90 that are expected to enter the river drainage at the stage of groundwater level recovery to absolute marks (+120…+145 m) are calculated. It is found that the probability of Сs 137 ions migration is very low, which can be explained by the specifics of migration mechanism. It has been demonstrated that radionuclide migration pathways differ in the form of distribution and groundwater flow directions at the final stage of mine flooding. It has been established that the developed continuously operating hydrochemical model of the region together with the application of actual monitoring data obtained from the underground and surface hydrosphere within the government-controlled area could be considered a practical tool of possible environmental threats control. Originality. The research novelty is associated with the investigation of quantitative parameters of radionuclide migration within the abandoned coal mining areas on the basis of geofiltration modelling of current mine flooding conditions, when groundwater level reaches the critical mark, and the level stabilization process is accompanied by water resources recovery and water balance components transformation. Practical implications. The proposed research technique enables to forecast environmental consequences of coal mines' flooding in Ukraine and to assess the hydrosphere pollution not only with radionuclides but also with other chemical elemen...

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Section: Analysis Of the Recent Studies And Publicationsmentioning

confidence: 99%

Risk assessment of radionuclide contamination spreading while flooding coal mined-out rocks

Sadovenko¹,

Ulytsky²,

Zahrytsenko³

et al. 2020

Min. miner. depos.

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“…Methods To identify the patterns of temporal and spatial changes of the groundwater regime in the selected site we used the finite-difference method and the software MIF developed at the Ukrainian State Geological-Prospecting Institute (Dnipro, Ukraine). This software was applied to hydrogeological analysis of numerous sites in Ukraine including water regulation issues in mining areas [14,15]. Numerical modelling of mining hydrodynamics included evaluation of ground-water regime parameters for the period of active coalmining and predictive calculations for closure and the post-mining period.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Environmental Engineering Protection and Water Resource Use at the Most Watered Mine in Ukraine

Sadovenko¹,

Rudakov²,

Zahrytsenko³

et al. 2020

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This study deals with the environment protection of mining areas affected by flooding and waterlogging in Western Donbas. We used finite difference numerical modelling to analyse the hydrogeological regime of mining sites as complex geotechnical systems being transformed under the multifactorial influence and parameter uncertainty. The developed ground water flow model of the most waterabundant mine in Ukraine named after N.I. Stashkov has been validated using the available data on chronological stages of mining. This enabled to identify the patterns of temporal and spatial changes of flow parameters, the locations of high transmissivity zones in rocks and balance water flows in carboniferous and shallow aquifers. Using the model we assessed the hydrodynamic conditions expected after closing and flooding the mine, particularly, the risks of nearby mine operation and environmental consequences to the ground surface. The groundwater level rebound is expected to take three years with emerging the zones of potential flooding and waterlogging in the Samara River floodplain. We compared four options of environmental engineering protection including the installation of stationary or submersible pumps in the mining horizon used for drainage, with evaluating the cost-effectiveness and anticipated environmental effect. The alternative option has been recommended to protect the floodplain from waterlogging by installing a groundwater intake in high permeable sandstones in the paleochannel.

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“…[60][61][62] specify general methods of the development of the numerical, mathematical geofiltration model involving several stages, among which are the following:-Systemization of data of mining and geological conditions; -The model identification in terms of the physical and dynamical analogy of the object; -Forecasting solutions (generally, integrity of the latter is identified by means of the schematization quality of the conditions as well as the model verification).…”

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confidence: 99%

Forecasting Underground Water Dynamics within the Technogenic Environment of a Mine Field. Case Study

et al. 2021

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The objective is to analyze the dynamics of the underground water of a mine field based on the study of the geofiltration process of the rock mass disturbed by mining to achieve safe extraction operations as well as subsurface territories at the stage of the mining enterprise closure. Numerical modeling, based on a finite difference method under the conditions of multifactority and definite uncertainty of processes of transformation of technogenic environment of a mine field, helps solve a problem concerning underground water dynamics forecasting. A hydrodynamic model of the M.I. Stashkov mine was developed while solving option series of epignosis problems in terms of the chronology of mine field stoping. The abovementioned made it possible to identify regularities of the history of filtration, the capacity parameters of rock mass and the expansion of areas of heightened hydraulic conductivity as well as to evaluate qualitatively the water balance components of a carbonic watered formation and an overlying one. The stage of mining closure helped obtain the forecasting hydrodynamic solutions. The efficiency of measures, concerning reduction of water ingress into mine workings and the mitigation of surface ecological effects of mine flooding was evaluated quantitatively. It was determined that implementation of the water control procedures makes it possible to perform a 10–38% decrease in water ingress. In this context, they may be applied both independently and simultaneously. In terms of mine closure and flooding, a period of complete underground water recovery takes three years; in the process, surface zones of potential waterlogging and swamping are developed within the floodplain of Samara River, located at the territory of Western Donbas (Ukraine). The scientific novelty is to define regularities of hydraulic conductivity transformation of the rock mass of a mine field starting from the mine working roof fall, up to its compaction during the mine operation period. To do that, nonstationary identification problems were solved, using numerical modeling. The abovementioned makes it possible to improve the reliability of hydrodynamic prognoses and develop technological schemes to control water at the state of the mine closure.

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Scientific and methodological foundations to develop numerical hydrodynamical models of mine fields in Donbas

Cited by 4 publications

References 5 publications

Risk assessment of radionuclide contamination spreading while flooding coal mined-out rocks

Risk assessment of radionuclide contamination spreading while flooding coal mined-out rocks

Optimization of Environmental Engineering Protection and Water Resource Use at the Most Watered Mine in Ukraine

Forecasting Underground Water Dynamics within the Technogenic Environment of a Mine Field. Case Study

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