BADANIA MODELOWE WIELOWARSTWOWEGO, PASMOWEGO ZBIORNIKA WÓD PODZIEMNYCH GZWP NR 138 PRADOLINA TORUŃ–EBERSWALDE (NOTEĆ) W CELU OKREŚLENIA JEGO GRANIC, BILANSU ZASILANIA I OBSZARÓW OCHRONNYCH

Abstract

MODEL INVESTIGATIONS OF THE MULTI-LAYERED, STREAKED GROUNDWATER RESERVOIR MGWB NO. 138 TORUŃ–EBERSWALDE (NOTEĆ) ICE-MARGINAL VALLEY FOR ESTIMATING ITS BORDERS, BALANCE RECHARGE AND PROTECTION AREAS

Abstract. Mathematical modelling is considered to be the basic method to define borders, balances of the groundwater circulation and borders of protected areas of major groundwater basins (MGWB) in Poland. Marginal valleys are specific because of their regional extension and drainage zones with relation to the adjacent moraine upland. The MGWB No. 138 – Toruń – Eberswalde Ice-Marginal Valley is an example of such a reservoir. It is about 140 km in length and about 2.0 –10.0 km in width. The basin is extensive, elongated and connected with surrounding systems. Within the area of this MGWB, 3 separate models were performed: I – in the western part, about 1190 km² large, II – in the central area about 1200 km² large, and III – in the eastern part, about 1080 km² large. Total range of the investigated surfaces was about 3470 km², including the area of groundwater reservoirs of approximately 1863 km². These models consist of 2 aquifers divided by a confined bed. They were developed for the steady flow conditions. The layer I is in the Quaternary multiaquifer formation, while the layer II is in the Miocene– Neogene level. The article presents the specificity of the construction of mathematical models for filtration conditions in widespread areas with a complicated hydrogeological structure. The article also describes the way of merging these tree models in order to prepare prognoses and water balances as well as to use these researches to optimize waters withdrawal at the existing environmental limitation.