Analysis of natural factors of security from polution basic aquifers south-western part of Voronezh region

Abstract

It discusses the natural conditions of protection from pollution of Kantemirov-Berek terrigenous and Upper Cretaceous carbonate-terrigenous aquifer complexes, as the main ones used for drinking water supply of the population in the south-western part of the Voronezh region. Factors are analyzed (depth of groundwater, lithological composition and thickness of low-permeable sediments of the aeration zone), determining the conditions for protection of free-flow aquifers from pollution. By a combination of factors, it has been established that in most of the research area the groundwater of the Kantemirov-Berek terrigenous complex is very poorly protected from surface contamination. A relatively high degree of protection of this horizon was noted in certain sections of the domes of the watersheds on the left bank of the Bogucharka River. Groundwaters of the Upper Cretaceous aquifer complex are characterized by a wide range of changes in conditions of protection from pollution. In river valleys, where the aeration zone is composed of fissured chalk and sandy rocks, groundwater is very poorly protected. It is reliably protected from contamination by the Upper Cretaceous aquiferous complex on the area of marls its overlap by the Kiev-Obukhov horizon, represented by clays and clay.