Author(s): Carmelo Juez, Iria Buehlmann, Gaetan Maechler, Anton J. Schleiss, Mario J. Franca
Linked Author(s): Carmelo Juez
Keywords: Fine sediments, river restoration, lateral embayments, surface PIV, shallow flows
Abstract: Systematic experimental investigations have been performed under uniform ?ow conditions in a channel whose banks are equipped with large scale rectangular roughness elements. The practical motivation of this project is to see how restoration of banks, such as lateral cavities, has an in?uence on the transport of ?ne sediments. The implementation of lateral cavities may a?ect the sediment and morphological equilibrium of the river since these may trap sediments. This work aims to study the in?uence of the lateral cavities on the transport of ?ne sediments in the main channel. A set of laboratory experiments are done which covers a wide range of rectangular cavity con?gurations and includes aspect ratios (lateral cavity depth divided by cavity length) between 0. 2 and 0. 8. Key parameters such as the ?ow discharge and the initial sediment concentration are tested. Surface PIV, sediment samples and turbidity temporal records are collected during the experiments. The trapping e?ciency of the cavities and the associated ?ow patterns are calculated and discussed. The resulting conclusions provide useful information for the future design of river restoration projects
Year: 2017