The aim of the project is to obtain overall information about flow structure in a vicinity of macrorough elements submerged at a bottom of revitalised river streams of smaller watersheads. The elements contribute to an improvement of water quality and natural conditions during low discharges, on the contrary they produce an increase of flow resistance for high flow rate, and they significantly affect morphology of the channel. The project focuses on a detailed description of the influence of the submerged elements on flow structure for various geometrical arrangements including sequential effect of the elements placed in series. Research methodology is based on mutual combination both physical and numerical modelling using selected turbulence models. The influence of revitalised elements on flow patterns and free surface location will be described taking advantage of modern experimental methods (LDA, UVP) in tilting hydraulic flumes. Based on validation of numerical simulation of free surface and velocity field around submerged elements the most suitable mathematical model will be specified. This model will be employed for further types of the submerged obstructions in geometrical arrangements and scales applicable in river engineering. |
