Chemical composition of groundwater in the zone of slow water exchange of the Upper Pontian aquifer, Northwestern Bulgaria

Abstract

The Upper Pontian aquifer occupies the central part of the Lom Depression. The geological position determines its gradual dipping from the periphery to the central parts. It is one of the most water-abundant aquifers in Northwestern Bulgaria and is associated with the sands of the Archar Formation. The chemical composition of the waters is of interest and is important for the water supply in the area. The analysis of the data shows that there are regularities in the change of the water quality with aquifer depth. Significant differences in some of the hydrochemical parameters are found in the zone of slow water exchange and geological and hydrogeological explanations have been sought.

Characteristics and features of the hydrochemical regime of groundwater in the upper Pontian aquifer, Northwest Bulgaria

“…Тези данни са въведени в ГИС и са визуализирани като карти на изменение на хидрохимични показатели. Проследени са пространствените промени на основните химични показатели, част от които са публикувани (Toteva, Shanov, 2021). Особено внимание е обърнато на пунктове, в които са взети повече от една проба или са мониторингови пунктове.…”