Numeric models of the vertical salt transfer at mine tailings to justify their option of reclamation

  • G. Yevgrashkyna
  • M. Kharytonov
Keywords: filtration, mass transfer, migration, hydrodispersion, remediation, numeric model, forecast

Abstract

A numeric model of the salt transfer at mine dumps were created on the basis of the theory of physicochemical hydrodynamics of porous media. Models designed to quantify the migration of macro- and microcomponents in time and space. We considered the following four types: a) without reclamation; b) reclamation in rainfed conditions to grow crops; c) with irrigation system; g) with wild vegetation.The first model represents the blade which is poured out without reclamation. The process of moisture transfer is infiltration. It provides a slow desalinization of the upper layers, stacked rocks with a speed of 1‒3 cm/year, depending on the magnitude of the salinity. The second model shows the migration of salts on reclaimed spoil rainfed agriculture. The presence of evaporative transpiration creates a mode of moisture transport. The negative consequence is the salinity of the bulk soil. The third model differs from the previous embodiment by the replacement of rainfed agriculture on a systematic irrigation of the mine waters of low salinity. The irrigation regime should be flushing. The model allows choosing the optimal salinity water for irrigation. The fourth model involves the free growth surface of the blade natural vegetation with low transpiration and is characterized by the accumulation of salts on contact with bulk clay layer.All variants are solved with the boundary condition of Danvers–Brenner on the earth's surface and 1 kind of on the border of the unsaturated zone and full water saturation. Migration parameters were determined from the analytical dependencies. The solution of the forecasting tasks on the quantitative assessment of the effectiveness of remediation for different periods was performed by the Thomas method. The adequacy of the models is confirmed by comparing the results of forecast with modal observations.

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Published
2018-02-19
Section
Agricultural sciences (agronomics, agricultural ecology, land reclamation, ecology, crops husbandry, farming)