Published on 03 July 2017
This article describes current status of North Ossetian artesian basin as one of the main water supply sources for population and industry of North Ossetia-Alania. North Ossetian artesian basin is the largest hydrogeological object on the territory of the republic. Its borders and distribution area coincide with the North Ossetian sloping plain. North Ossetian artesian basin is a huge reservoir, 25% of which is filled with groundwater. Northern boundary of the North Ossetian sloping plain and accordingly, the North Ossetian artesian basin runs along the watershed line of the Sunzha ridge, Southern – along the foot of a Wooded ridge. The basin is bounded by Nazran-Yandyrsk and Datyksk hills in the East; in the West it is delimited by Zmeysky highland (Zmeysky mountain range). Absolute height of the plain is in the range of 800-320 m. The North Ossetian sloping plain, which coincides with the eponymous artesian basin, is a deep depression (deflection) of Jurassic, Cretaceous Paleogene and Neogene sediments, filled with boulder and pebble deposits from the Miocene to modern, all together they form so-called molasse. The beginning of foredeep formation on the territory of North Ossetia-Alania and the mode of sustainable deflection are established from the upper Sarmatian on the background of general uplift of the Greater Caucasus. Depth to groundwater within the plain (basin) varies significantly. For instance, near the cities of Vladikavkaz and Alagir, they occur at depths of 100-150 m near the town of Ardon and Beslan – at a depth of 20-40 m, and in the area of Bekanskiy HPP groundwater comes to the surface. Water catchment area of the depression is about 6000 km2, the area of distribution of the North Ossetian basin is about 1900 km2. Despite the fact that groundwater quality of the Ossetian artesian basin is good (meets the requirements of SanPiN 18.104.22.1684 – 01 “Drinking water”), special attention is paid to a problem of groundwater quality degradation in the South-Eastern part of the basin, ie, in the Northern part of Promyshlenny municipal district of Vladikavkaz. Possible reasons of this fact are analyzed. Presumably, the main causes of this negative phenomenon can be: 1. Intense unsystematic exploitation of aquiferous horizons of underground waters directly from the basin and beyond – in the area of basin nutrition aquifer, particularly in Ordzhonikidzevskoe deposit of underground waters. 2. Pollution of air, soil and underground waters by local industrial enterprises, especially by JSC “Electrozinc”, JSC “Pobedit” and their decomposing polygons of slag dumps. For the identification of extent and causes of groundwater pollution in the South – Eastern part of the North Ossetian artesian basin and for the adoption of appropriate preventive measures it is necessary to conduct ecological and hydrogeological survey at the sites of JSC “Electrozinc” and JSC “Pobedit” and to conduct a comprehensive analysis of this problem. It is necessary to conduct hydrogeological studies of Ordzhonikidzevskoe underground water deposit with the revaluation of operating inventory and elaboration of rational scheme of mining. A permanent monitoring of underground water on the territory of the North Ossetian artesian basin for all active water wells and the analysis of results are needed.
Categories: Articles, Geo-ecological,-Recreational-and-Biomedical-Issues-of-SDMT
Tags: водозаборы, артезианский бассейн, моласса, конгломераты, аллювий, водоносный горизонт, водоупор, шлаковые отвалы, жесткость воды.
ISSN 1998-4502 (Print) ISSN 2499-975Х (Online)