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Hydrogeological Peculiarities Of Explored Groundwater Supply Revaluation In Azerbaijan

Congress: 2015
Author(s): Adishirin Alakbarov, Elkin Rustamov
Azersu OJSC / Sukanal SRDI1

Keyword(s): Sub-theme 1: Water supply and demand,
AbstractIn recent years Azerbaijan carried out extensive work on the reconstruction and building of water systems in all small and big cities. Resources of both surface and ground waters are used for population water supply. Basic fresh groundwater supply of Azerbaijan is concentrated in hydrogeological basins in piedmont plains. Regional groundwater supply in these basins was mainly evaluated in the years of 1970-1980. Groundwater supply within these basins is evaluated and approved by more than 50 specific fields, giving the basis for the construction of water intake facilities. Analysis performed and conducted exploratory research on specific water intake show that approved regional resources and groundwater supplies, to date, do not fully and reliably reflect the real situation and are significantly underestimated. This is mainly due to the fact that in the meantime there have been notable changes in the water utilization system, in quantitative and qualitative content of groundwater nourishment sources. Also there is a need to adjust approach and methods of determination of hydrogeological parameters and estimation of reserves. Regional groundwater resources in interstitial and edge water basins in piedmont plains were usually assessed by analytical calculations of abstract water intake flow rate, according to the scheme of wells uniformly distributed on the area or working in circular layers with impermeable boundaries, and according to the water intake scheme of a linear series of wells working in a semi-closed layer with two boundaries: constant zero flow and constant pressure. Calculations were made for a groundwater withdrawal uniform regime for settlement period up to 10,000 days. We believe that the observed discrepancy between the estimated exploitation resources and groundwater supply with the actual conditions is due to several reasons. First of all, upon calculation of groundwater supply computational mathematical relations were not always consistent with the real mode of production which resulted in wrong outcomes. Secondly, in terms of technogenesis the so-called developed groundwater supply is being formed on account of attracting additional sources. The methodology used for evaluation of groundwater supply does not allow for considering additional sources, forming the structure of the existing resources and groundwater reserves. The most important negative factor in this issue is the low degree of reliability inherent in the calculation of hydrogeological parameters, as evidenced by the results of experimental filtration works carried out in recently drilled exploration and evaluation wells. For example, the maximum well flow rate obtained from exploration wells drilled in the 70s within a known Agrichai-Alazan groundwater basin justifying groundwater supply counting did not exceed 58 l/s, whereas, well flow rate from evaluation wells drilled in the same area in 2009-2010 was 200-250 l/s and more. Or, if depression head in exploration wells drilled in the Karabakh plain in the early '80s to justify groundwater supply counting with well flow rate of 22-25 l/s was 8-17 m, than in an evaluation well drilled on the same area in 2012, the groundwater level with well flow rate of 27 l/s fell by only 2 m. These and other results of studies performed in recent years show a significant underestimation of values of fundamental hydrogeological parameters inherent in reserve calculations. We believe that the reason for this lies mainly in the construction, filter cake removal and testing of exploration wells. This list should also add in poorly studied groundwater flow of fracture-vein waters of mountainous regions and their role in shaping of groundwater supply within edge-interstitial groundwater of piedmont plains. Based on the above, and taking into account the past-due status of calculation period of approved reserves, it has become necessary to reevaluate them. In doing so, the methods of evaluation of exploration resources and groundwater supply, considering comprehensive factors and particular characteristics of formation of existing resources and reserves structure, as well as restrictions as contributing to both the protection of quantitative and qualitative groundwater resources parameters and the environment should be used. Simultaneously set of studies on evaluation of exploration resources of fissure-vein fresh groundwater of mountainous regions of the country with zonation of active water exchange and deep groundwater run-off should be carried out. 1. “Azərsu” ASC. İllik hesabat. 2012. Bakı, 2013-87 səh. 2. Алекперов.А.Б. Ожидаемые изменения геоэкологической ситуации под влиянием крупного отбора подземных вод в Алазань-Агричайской долине Азербайджана - Ресурсы подземных вод “Mатериалы Международной научной конференции, Москва, 13-14 мая 2010г, стр.128-133” 3. Геология Азербайджана Том VIII Гидрогеология и Инженерная. Изд. “Nafta-Press”, Bakı-2008
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