The analysis of variability of riverbed elevation recorded at three selected gauging cross-sections: Czchów on the Dunajec River and Olchowice and Rzuchów on the San River is presented in the paper. The studies concern the period of more than one hundred years. The focus is on the analysis of the river course maintenance at selected gauging stations. The research shows that the river course may change spacially and temporally with varying intensity. In the period of 50 - 100 years, these changes can be slight, but permanent changes in the direction of the river channel development can be also observed. The paper presents the trends of riverbed changes during the long period of time of the selected mountain tributaries of the upper Vistula River, which were studied on the basis on the variability of observed mean annual water stages. In the paper there are given the reasons for the observed changes in the river course and channel geometry. These changes were caused by river regulation consisted of the shortening and narrowing of the river channel and the sediment exploitation as well. The method of assessment of the variability of the river channels level in the long period ...
The analysis of variability of riverbed elevation recorded at five selected gauging cross-sections of Nida River, and at three gauging stations of Czarna Nida is presented in the paper. The studies concern the period of 60 - 80 years of observation. The trends of riverbed changes during the study period at the selected gauging stations were calculated based on the variability of observed minimal annual water stages. The reasons for the observed changes in the river course and channel geometry are given. These changes were caused by river regulation consisted of the shortening and narrowing of the river channel. Moreover, grain size distribution analysis in the selected gauging stations of Nida River and characteristic diameter variability of sediments along the river course examination are presented. These analyses were to evaluate the variability of characteristic diameters along the river course in connection with observed changes in cross-sections' geometry. Additionally, to confirm the process of erosion or deposition recognized in the examined river channels, hydrodynamic equilibrium was determined. Three methods were proposed and used: the mean velocity and critical velocity in the main river channel comparison, the stream power value calculation which defines the character of the river channel, and the WWK ...
