IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Experimental and Numerical Investigation of Steady and Unsteady Flows in Roughened Channels with Cro...
Experimental and Numerical Investigation of Steady and Unsteady Flows in Roughened Channels with Cross Beams
Author : Christoph Gogolin, Rita Carvalho, Daniel B. Bung and Jorge Matos
In longitudinal drainage systems, high discharges may occur suddenly due to short, intense rainfalls. These high discharges and related high flow velocities lead to high shear stresses near the bottom and can thus cause significant damages to the structure. It is well known that the installation of cross beams enhances the energy dissipation along roughened channels (RCCB). In this work, we study the flow characteristics over cross beams in rectangular drainage systems; their height (5 and 10 cm) and spacing (0.5, 1.0, 1.5 and 2.0 m) were tested on a 5 % slope channel. Measurements of water depths based on an image processing technique were carried out for the different configurations in steady state conditions. The data is compared with numerical simulations as well as with recorded data of previous studies with slopes of 10 % and 15 %. The numerical results were obtained by the open-source code TM OpenFOAM . A fair agreement was found between numerical and experimental results. Moreover, for the present slope (5 %) the effect of unsteady approaching flow on the water depths is investigated. Different scenarios for unsteady flow were tested applying diverse hydrographs and measurements were taken during the unsteady time interval.
File Size : 794,786 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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