Author(s): K. Plesinski; F. Pachla; A. Radecki-Pawlik; T. Tatara; B. Radecki-Pawlik

Linked Author(s): Artur Radecki-Pawlik

Keywords: Boulder blocks ramps; Low head hydraulic structures; Field measurements; Hydraulics; Riverbed morphology

Abstract: The description of flow in streams is a very complex problem. Physical analyses of this phenomenon provide a quantitative description of water flow, allowing the creation of mathematical models that have an important practical meaning. The rapid development of numerical software programs has improved their practical implementations; therefore, the results of analyses and solutions of flow problems in both open channels and pipes obtained through numerical modelling could be applied in practical solutions. Numerical models are often practical in studies covering a wide range of analysed parameters. However, it must be understood that the similarity between a real river and its model could only be partially verified. The main purpose of this paper is to investigate the effect of the selected boulder block ramp hydraulic structure on Poniczanka stream on sediment transport using the CCHE2D numerical model, assuming several situations, depending on the type of riverbed (erodible, non-erodible, rocky) and the kind of rock blocks used for hydraulic structure construction. The obtained results were compared with the Hjulstr"om graph, which is a classic approach for the identification of fluvial processes in river channels (erosion, sedimentation, transport). In addition to these two methods, field observations were carried out which included the determination of horizontal and vertical changes to the riverbed morphology of the examined section river reach.

DOI: https://doi.org/10.15142/T31M17

Year: 2018