NUMERICAL DESCRIPTION OF THE GROUNDWATER LEVELS CHANGE DUE TO THE RE- AND DISCHARGE OF THE ADJACENT SURFACE WATER BODIES – PROBLEMS AND CASE STUDIES

Numerical description of the groundwater levels change due to the re- and discharge of the adjacent surface water bodies – problems and case studies. The water exchange between the surface water bodies (rivers, lakes, seas, dams, etc.) and adjacent water-bearing beds is possible if a hydraulic connection between them exists. The change of the levels of the first ones causes corresponding changes of the levels of the aquifers in the surrounding territories and vice versa. In many cases this interaction is the primary mechanism determining the groundwater regime. The aim of the present study is to examine the applicability of the most general possible analytical approach for quantitative description of the phenomena in the case of short-term changes with a significant magnitude (high waves) of the level of the river of Maritsa in Plovdiv, Bulgaria. The study is performed through numerical simulations/calculations, with especially composed by the authors for this work computational programs.