The Prognosis of Influence of The Oder River Waters Dammed by Malczyce Barrage on Left Bank Areas

Abstract

The finalisation of the construction of the Malczyce barrage is planned for 2015. Damming of the river will cause a change in the water and ground conditions in the adjoining areas. The paper analyses the influence of the water level in the Oder River dammed by the barrage on groundwater table level in the left bank valley. A model which allows the prediction of groundwater levels depending on the assumed water level in the Oder was constructed. The analysis was conducted for three different variants: for the initial stage before damming the Oder River and for the conditions after damming the water up with and without the drainage devices included in the project. The calculations were done in several chosen transects across the river valley. The mathematical model of flow in the aquifer based on the Richards equation was applied. The results of calculations were presented as the spatial distribution of piezometric pressures which were used to determine the groundwater table for each of the transects. The calculation results from the vertical models were transposed into a horizontal model. The comparison of appropriate results allowed to positively verify the designed model and to analyse the effectiveness of the realised project solutions.

Analysis of the effectiveness of the systems protecting against the impact of water damming in the river on the increase of groundwater level on the example of the Malczyce dam

“…1). The identification of parameters used in simulations of the mathematical model was carried out using measurements of groundwater level in piezometers carried out in the years 1970-2010 [2].…”

“…After identifying the permeability coefficient, the model was verified by comparing the calculated ordinates of the water table with measurements from the years 1970-2011 [11]. As the boundary conditions, medium-sized water levels in the Odra, the Średzka Woda and the Jeziorka were assumed before the planned damming [2]. The water level in the Odra River at the entrance to the model amounted to 98.32 m asl.…”

“…The picture is fully in line with what you see in reality. Among the eight selected piezometers in the studied area [2], four fall within the range between the limit values of the groundwater table. The ordinate of water calculated in the G4 piezometer is 20 cm lower than the minimum measured in reality (tab.…”

“…The barrage in Malczyce analysed in the article, located at 300 km of the Odra river, will be the last regulatory facility on the Odra river after completion of construction [2]. At the same time, coastal areas will be exposed to increased percolation of water from the riverbed.…”

Międzyodrze: an example of diverse economic and nature-related activities in the part of the Lower Odra Valley

“…The Polish-German border runs along the Odra River up to the river fork in Widuchowa, and from the fork to the Gryfino Both the Lower Odra and the entire Odra estuary have been intensively changed by humans [CHALFEN et al 2014;OLSZEWSKA et al 2014]. At the end of the 19th century and at the beginning of the 20th century, the Eastern Odra River bed was dug over and formed in its current setting.…”