Zygmunt Babiński

Reducing of Water Turbidity by Hydrotechnical Structures on the Example of the Wloclawek Reservoir

The dynamics of river sediment transport reflects morphogenetic processes taking place in the catchment, being at the same time an anthropogenic indicator. The aim of the research is to determine the impact of hydrotechnical structures on the continuity of suspended sediments transport. The research area is the Lower Vistula River with a single dam – Wloclawek, operating since the 1970s. The research included direct measurements of water turbidity in 2013–2016 in characteristic cross-sections of the Vistula River, using commonly used methods. The LISST-25X laser grain composition measurement sensor was also used to collect data, enabling determination of grain size of the suspended sediments. However, on the selected section of the river, modelling of momentary transport of suspended sediments using GIS tools was carried out. There was a significant dynamics of sediments transport in the longitudinal profile of the river, in relation to the diversity of hydrological and morphological conditions of the Vistula River. The impact of Wloclawek Reservoir on water turbidity reduction was determined. The balance of transport of suspended material was related to the processes of erosion and sediment accumulation below the dam. The functioning of the Wloclawek Reservoir in the current system (as a single dam) has a significant impact on sediment transport, which directly determines the course of fluvial processes across the entire Lower Vistula (from km 675 to the estuary) and indirectly in the coastal zone of the Baltic Sea.

A comparison of research approaches in estimation of volume changes of a bed load transport along a river course on the example of a large lowland river

This paper presents research methods applied for calculation of a transported bed load of large lowland rivers. The research area consists of two measurement profiles on the Vistula River (Poland) in its lower course. The part with results shows the output of two research approaches used by the authors to determine the capacity of bed load transport. The first one concerned the presentation of own field measurements which involved testing sand bar dynamics with surveying and cartographic methods. The second approach was application of calculation methods in the form of a simple mathematic formula developed for the Vistula River by [1].This paper presents research methods applied for calculation of a transported bed load of large lowland rivers. The research area consists of two measurement profiles on the Vistula River (Poland) in its lower course. The part with results shows the output of two research approaches used by the authors to determine the capacity of bed load transport. The first one concerned the presentation of own field measurements which involved testing sand bar dynamics with surveying and cartographic methods. The second approach was application of calculation methods in the form of a simple mathematic formula developed for the Vistula River by [1].

Using GIS to appraise structural control of the river bottom morphology near hydrotechnical objects on Alluvial rivers

The paper presents the results of analyses of structural changes of the Vistula River bottom, in a section of direct influence of the bridge in Torun (Northern Poland) fitted with one pier in the form of a central island. The pier limits a free water flow by reducing the active width of the riverbed by 12%. In 2011, data on the bottom morphology was collected, i.e. before commencing bridge construction works, throughout the whole building period – 38 measurements. Specific river depth measurements are carried out with SBES and then bathymetric maps are drawn up every two months. The tests cover the active Vistula river channel of 390 – 420 metres in width, from 730+40 to 732+30 river kilometre. The paper includes the results of morphometric analyses of vertical and horizontal changes of the river bottom surrounded by the bridge piers. The seasonality of scour holes and inclination of accumulative forms (sand bars) in the relevant river reach was analysed. Morphometric analyses were performed on raster bases with GIS tools, including the Map Algebra algorithm. The obtained results shown that scour holes/pools of up to 10 metres in depth and exceeding 1200 metres in length are formed in the tested river segment. Scour holes within the pier appeared in specific periods. Constant scour holes were found at the riverbank, and the rate of their movement down the river was 0.6 to 1.3 m per day. The tests are conducted as part of a project ordered by the City of Torun titled ‘Monitoring Hydrotechniczny Inwestycji Mostowej 2011 – 2014’ (Hydrotechnical Monitoring of the Bridge Investment, period 2011 – 2014).

Transport ładunków ponadgabarytowych drogą wodną Wisły. Podstawowe parametry szlaku oraz główne utrudnienia

Transport ladunkow ponadgabarytowych drogą wodną Wisly. Podstawowe parametry szlaku oraz glowne utrudnienia

Prediction of the Vistula Channel Development Between Wloclawek and Torun: Evaluation with Regard to the New Geological Survey

Abstract The aim of this paper is to present the geological structure of the Vistula river valley floor as the modifying factor of fluvial processes and present the development conditions of the contemporary Vistula river channel, which underwent marked transformation due to bed erosion and lateral erosion below the Włocławek reservoir. The analysis of the geological data and the geological survey conducted at the study reach of the Vistula between Włocławek and Toruń resulted in an image of the geological structure of the channel bed along the longitudinal profile