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Calculations and prognosis of the influence of the exploitation of the "Hotyslavske" quarry on the hydrodinamic of the ground and underground waters of the Western Polissya

The problems of the influence of the exploitation of the deposit of the sand and chalk "Khotislavske" on the hydrodynamics of ground and underground waters of Western Polissya are considered. At this the analytical methods of calculation of geophiltration processes and methods of mathematical modeling were used. The analysis of the validity of forecast calculations and modeling of the influence of a quarry on the territory of Ukraine carried out by the Belarusian side and the comparison of data are carried out.


Introduction
The development of the deposit of building materials "Hotislavske" on the territory of the Republic of Belarus for many years has been the subject of discussions on its possible impact on the adjoining territory of Ukraine.
This problem was particularly acute when known specialists and specialists came to the conclusion that is the real possible negative impact of the quarry development on the territory of Western Polissya including the territory of the Shatsk National Park.
Taking into account the aforementioned, the problem of quantitative assessment of the transboundary impact on the territory of Ukraine on the development of this field for the long-term period of its exploitation was raised.

Analysis of recent researches and publications
In the process of the investigations the hydrogeological conditions of the territory of Western Polissya and the conditions of the formation of water resources of the zone of active water exchange the hydrological conditions, the state of surface water courses including the reclamation facilities and the modern water and ecological status of a certain territory were analyzed and determined.
In addition on the base of the analysis of the hydrodynamic conditions of the main aquifers and the filtration schemes of the ground and underground waters interactions in the given area have been developed which allowed to create a conceptual model for water exchange of surface and groundwaters. When creating the model the results of the modeling of the impact assessment on the environment of the Khotilaslavske field development which are presented in the  O.O. Diatel, 2018 corresponding Report of the Belarusian side [13] and monographs [2,14], were used and analyzed. It was shown that the results of the impact can be considered approximate in connection of with the insufficient reliability of the used data by the Belarusian specialists.
The purpose of the research is to evaluate the impact of the development of the sand and chalk deposit "Khotilslavske" (Republic of Belarus) on the hydrogeological and hydroecological conditions of the territory of Ukraine within the Western Polissya, including the territory of the Shatsk National Park.
In this case the analytical methods of calculation of processes of geophylration and methods of mathematical modeling were used. In addition the analysis of the validity of the projected calculations and modeling the impact of a quarry on the territory of Ukraine performed by the Belarusian side and the comparison of data has been carried out.

Research results
The research area is characterized by complex hydro-geological conditions and is not well understood especially in the north-western part where the Kopayevsk drainage system is located [14,2].
Absence of reliable data on the separate areas of the determined territory predetermines the approximate approach to the calculations and forecasting of the impact of the operation of the quarry on the hydrodynamics of the ground and underground waters of Western Polissya within its possible influence (Figure 1), which is also noted in the Report of the Belarusian side [13].
Water intake to the quarry is formed at the expense of natural resources of the main aquifers and atmospheric precipitates and at the hydrodynamic schematization it can be considered as a radial flow to a well with a large diameter in an unbounded area of filtration with the assignment on the contour of the quarry the corresponding boundary conditions (values of water intake or constant drawdown on the contour of the quarry).
Proceeding from the foregoing one can consider the problem of water inflow to a large diameter well in a three-layer aquifer unbounded in plane with the absence of flowing from below aquifer and with infiltration recharge [6,12].
In the assumption of a rigid regime of filtration in a weakly permeable distribution layer of the colmatation zone of the marl-chalk layer and the failure to take into account the infiltration feed of the ground stream the process of transient filtration can be described by the following system of differential equations in partial derivatives [12]: where thour, day; rcoordinates in space and Qconstant water uptake from the well.
Equation (3) is a complex analytic expression which can only be realized in a numerical way. To do this an appropriate software package was developed and special tables of filtration resistances for multilayer filtration schemes were designed which greatly simplify the calculations and simulation of the problems of the given class [7,12].
It is known that in practical calculations the process of interconnection of aquifers through weakly permeable layers during water uptake from one of the horizons can be divided into several stages, namely [6,7,12]: 1. small times when the magnitude of the drawdown in the adjacent horizon is insignificant and mainly in the horizon from which the water uptake takes place one can consider the filtration according to the scheme of the isolated water-bearing layer; 2. intermediate times when the flow from the adjacent horizon begins; 3. intermediate large times when there is an uneven drawdown in levels and heads in both horizons; 4. The time when the magnitude of the drawdown can be calculated according to the scheme of a single-layer formation with integral parameters of the whole water-bearing thick: For small times the expression for calculating the time criterion of the well operation in the scheme of a single-layer formation has the following form [7]: Substituting the data on the aquifer of the quaternary deposits in the area of the quarry days that is the water uptake from the quarry is provided of only from the horizon of groundwater during 4 days after which the interaction with the lower horizon in the marl-cretaceous strata begin because of the flow from the bottom to the top.
Since according to project decisions [13] the production of chalk and sand from a quarry is planned until 2040 that is for 30 years starting in 2009 when the development of the first stage of the deposit began it is interesting to calculate the time criterion after which the water uptake from quarry can be modeled according to the scheme of a single-layer formation with integral parameters of the entire aquifer. For this case the following dependence is recommended [7]: Substituting the data for the quarry area taken from the model of the Belarusian side we obtain that B = 419 m. At t days that is after 270 days the system of aquifers can be considered as the only one aquifer with integral parameters of the whole water-bearing thick.
As a rule at calculations of quarry drainage one operates the concepts of working out of depth of a quarry with the corresponding drawdowns of the levels of ground water in it. Forecasting relative to drawdowns is more reasonable than the designation of drainage design values in a quarry as in the development of deposits the determination of drainage values is more approximate in comparing with the calculations of the distribution cone of depression with a constant drawdown in the career contour.
Taking into account the accepted schematization of hydrogeological conditions in cross section of the research area the following dependence was used to determine the impact of the development of a quarry on the level regime of groundwater [1,9]: where ( ) t r S ,the magnitude of the drawdown at the time t at a distance r from the quarry; r0radius of a "big well" that is a career, m; S0the design value of drawdown of the level of groundwater at a water uptake, m; ( ) The advantage of using this model is that the calculation of drawdowns is taken from existing levels of ground water in which the infiltration takes into account and for long-term forecasts this assumption is justified [9].
Since Data of numerical simulation at different distances from a quarry at S0 = 12.0 m are given in Table 1. Based on the results of the simulation the graphs of groundwater levels drawdowns in dependence of the distance from the quarry to the area of possible influence on the given periods of time were building (Figures 2-3).
As can be seen from Table 1 and from the corresponding graphs of the drawdowns the potential impact reaches the Pripyat river by 2025 where a drawdown of S = 0.115 m is forecasted. The radius of influence will be more than 16 km. The zone of influence will include lakes Svyate, Velychovo, Tursk reservoir and a significant number of settlements of the border with the territory of Belarus.
The levels of water in the lakes of Svyate and Velickovo will decrease respectively by 2.02 and 1.62 m at the existing depth of the lake Svyate 15.0 m that is the depth of the lake can be reduced by about 2 m. As for the reservoir of Tursky at its depth of 2.0 m a decrease of 1.35 m will practically change its hydrological regime [14,5]. In addition the drawdowns of ground water levels in the impact zone by 0.5-1.5 m will worsen the water supply conditions of the population living in this area.
A more difficult situation may arise as of 2040. The impact of quarry development will be of a regional level. The radius of influence will be more than 29 km reaching the territory of Shatskу lakes (Fig. 1). So the water level in the lake Lutzumer is projected to be 0.1 m below the current one that is all lakes of Shatsk National Park will fall into the zone of influence.  (Fig. 4). As can be seen from the map the magnitudes of the drawdowns differ significantly among themselves and the distribution of the impact zone according to the modeling of the Belarusian side by 2040 to some extent coincides with the data of the calculations performed at S0 = 12.0 m on 2025 taking into account and without compensatory measures to decrease the zone of influence on the territory of Ukraine. Thus even with the development of only the upper part of the quarry cross section the projected impact will cover a significant territory of Ukraine.
The next stage in the assessment of the impact of the exploitation of the quarry was the simulation of the drawdowns of groundwater levels by 2040 with the designation on the quarry contour a constant value of drawdown S0 = 45.0 m for a period of 15 years from 2025 to 2040 according to design decisions for the development of this deposit [3,13].
The choice of the modeling period from 2025 to 2040 at S0 = 45.0 m is due to the assumption that by 2025 the second queue of the quarry will start working as there are no exact dates for the introduction of the second stage in the reporting materials of the Belarusian side. At all forecasting maps for 2014, 2019, 2024 and 2040 the isolines of drawdowns are given at S0 = 12.0 m (Fig. 4)  The analysis of the calculation data and the data of the observation wells indicates that there is a sufficient agreement between the data of calculations and regime observations as both regime data and estimated data show almost the same drawdowns in groundwater levels at a distance of 7.0-7.6 km from the quarry on 2016 year.
The comparative characteristic of the obtained data allows us to assert that for the accepted schematization of the technogenic conditions in the zone of possible influence of the operation of the quarry the indicated calculation models are reasonably reflect the process of changes in water exchange on the territories adjacent to the quarry.
In order to assess the possible impact of the development of a quarry with the full development of its on 2040 year with a design drawdown of S0 = 45.0 m an appropriate numerical modeling of the distribution of influence on the basis of dependence (7) was conducted. Data model calculations are given in Table 2. According to this simulation a map of the depression distribution was constructed in the definite area of research for the forecast period of 2040 (Fig. 5).
The obtained data indicate that the zone of possible influence with full development of a quarry practically covers the entire study area within a radius of 29.0 km. The influence will extend also and in the eastern direction beyond the investigated filtration area on the same distance (Fig. 1, 5).
As can be seen from Table 2 the influence of a quarry reaches in the 2040 year the group of Shatskу lakes. On the territory of Shatsk National Park the groundwater levels will decrease from 0.1 to 0.2 m on average.
If you compare the estimated values of the drawdowns with the depths of individual lakes then it is predicted that, for example, the depth of the lake Svyate will decrease by 10.0 m relatively the present depth of 15.0 m, the depth of the lake Liutsymer will decrease by 0.2 m at the present 11.2 m, the depth of the lake Krymno will decrease by 1.43 m with the existing 6.0 m, lake Luky at 0.7 m with existing 3.5 m, lake Svityaz with 0.2 at existing 58.4 m. As all lakes are hydraulically connected their hydraulic regime will change significantly and the lakes with small depths located in the zone of the influence where the forecast drawdowns will be of the order of 3-10 m will be practically on the verge of drying out.
A similar picture should be expected regarding the river network. Taking into account the fact that almost all watercourses in the territory are characterized by insignificant depths, for example, the depth of the Pripyat River near village Ritchitsya is 2.73 m and higher along the channel the depth is yet smaller, the depth of the Vyzhivka River near the village Vyzhivka is 0.97 m it is possible that there will be drying out of all rivers. Gradually instead of the drainage function the river system will turn into a groundwater recharge area whose drawdowns of the levels will result in an increasing of the thickness of the aeration zone and the drying of the main aquifer. Khotyslavsky quarry with hydrodynamic schematization can be considered as a separate field which drains aquifer complex of ground and underground waters. In the conditions of the steady filtration in the unbounded water aquifer in the plan the water inflow to the quarry by 2040 can be calculated according to the following dependences [9,12]: where Tcoefficient of the permeability of the complex, Т = 420 m 2 /day; S0 = 45.0 m; Rradius of influence in the field of filtration, R = 29.0 km; r0quarry radius, r0 = 400.0 m [14].
Substituting the given data into (8) we obtain that Q = 27732 m 3 /day that is for the conditions of ensuring of the lateral recharge of the complex the designed drainage from the quarry is almost equal to the quantity of the water inflow. Taking into account the fact that the recharge of the aquifer system will decrease due to precipitation and in order to ensure water inflow to the quarry the area of the impact of its will be expanded changing the water balance within the entire area of distribution of the aquifer complex [2,15,16].
It should be noted that in the forecast period the water withdrawal from the aquifer system will also increase for water supply of the population with drinking water. In total it is planned to increase the water withdrawal to 50 thousand m 3 /day and in general taking into account the drainage from the quarry the water uptake will increase to 70-75 thousand m 3 /day [13].
Thus the carried out numerical-analytic calculations and simulations have shown that the development of the Khotsyslavske sand and chalk deposit for the projected period of operation by 2040 will significantly change the hydrodynamic conditions in the territory of Western Polissya and in general will aggravate the hydrogeological and ecological situation in the defined territory.

Conclusion
According to the results of numerical simulation for the 1st stage of quarry development at S0 = 12.0 m it follows that by 2025 the potential impact will reach the Pripyat River where the decreasing of the groundwater levels is expected to be S = 0.115 m. The radius of influence will be more than 16 km. The zone of influence will include the lakes Svyate, Velychovo, Tursk reservoir and a significant number of settlements within of the border with the territory of Belarus.
A more difficult situation may arise in the development of the second stage with a drawdown of 45 m (S0 = 45.0 m) by 2040. The impact of a quarry development will be of a regional character. The radius of influence will be more than 29 km reaching the territory of Shatskу lakes. The influence will spread and in the eastern direction beyond the investigated filtration area.
In addition the conclusions of the Belarussian specialists that the development of the stated quarry will not influence on the territory of the Shatskу lakes are doubtfully as in the Belarusian model this area is not included.
On the whole the comparative characteristics of the obtained data allows to suggest that for the schematized technogenic conditions in the zone of possible influence of the exploitation of the quarry the indicated calculation models are reasonably reflect the processes of the changes in the water exchange on the adjacent to the quarry territories.