Numerical modeling of filtrational water exchange within poorly drained watersheds of Lesnaya and Mukhavets rivers (Belarus)

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Abstract

A new methodological approach to the quantitative assessment of infiltration water exchange in poorly drained river basins is presented. Its implementation is demonstrated by the example of a numerical geofiltration model (NGFM) of the watersheds of poorly drained Lesnaya and Mukhavets rivers, which occupy the bulk of the Brest hydrogeological basin area (BHGB). NGFM of the Lesnaya and Mukhavets river catchments was created on the basis of licensed ModTesh software of Geolink CJSC. The model calibration consisted in obtaining a preset value of groundwater flow into rivers and matching the model and actual groundwater heads for the summer-autumn season by determining the infiltration recharge intensity (IRI) and the conductivity of subsurface sediments. Satisfactory results were obtained after dividing the model inflow into blocks with the groundwater discharge into rivers and the infiltration discharge through the aeration zone. To estimate the resulting infiltration recharge (IR), we used a technique consisting in setting a fictitious boundary of the third type above the groundwater aquifer in the form of a low permeable layer and a reservoir, in which the water levels of groundwater aquifer are duplicated. Application of this technique resulted in the minimal discrepancy between the values of model and actual groundwater heads (below the error level in the initial data). A quantitative assessment of the long-term resultant IR is given, which is an integral indicator of the modern vertical groundwater exchange with the environment. The change in the resulting IR value by the catchment area of Lesnaya and Mukhavets rivers is shown as a separate map. The components in the balance of ground-, interstratal and surface water in the catchment areas of the Lesnaya and Mukhavets rivers have been assessed quantitatively, taking into account the yearly changes in IRI.

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About the authors

V. G. Zhoglo

Institute for Nature Management, National Academy of Sciences of Belarus

Author for correspondence.
Email: w.zhoglo50@tut.by
Belarus, ul. F. Skoriny 10, Minsk, 220114

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Supplementary files

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2. Fig. 1. Tectonic map of the eastern part of the PBB [12]: 1 — basement surface contour lines, km; 2 — local structures (Pribugskaya, Kustinskaya); faults: 3 — penetrating the cover, 4 — not penetrating the cover; 5-8 — boundaries of distribution of deposits of structural complexes: 5 — Lower Baikal, 6 — Upper Baikal, 7 — Caledonian, 8 — Vendian trap formation; 9 — gabbro-diabase intrusions; 10 — lines of geological profiles; 11 — well and its number.

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3. Fig. 2. Geological section along the strike of the PBB along the profile Okunev – Dobre – Melnik – 1-K – 10-K – 12-K – 5-K – 3-K – 4-K – 6-K [12]: 1 – crystalline basement rocks, 2 – faults, 3 – geological boundaries, 4 – wells

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4. Fig. 3. Hydrodynamic map of the GVG (based on materials from the RUP “SPC for Geology” and [13, 18]).

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5. Fig. 4. Hydrodynamic map of the Paleogene-Middle Quaternary aquifer complex (based on materials from the RUP “SPC for Geology” and [13, 21]).

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6. Fig. 5. Dependence of the resulting value of groundwater recharge on the regularization coefficient of the fictitious low-permeability layer.

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7. Fig. 6. Map of the resulting value of the GW IP after reconciling the actual and model GW values (based on the modeling results).

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8. Fig. 7. Map of the IIP GV in the catchment areas of the Lesnaya and Mukhavets rivers after reconciling the initial and model values of underground flow into the rivers (based on the modeling results).

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