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 : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Numerical simulation of erosion processes on crossbar block ramps
Numerical simulation of erosion processes on crossbar block ramps
Author : MARIO OERTEL(1), JAN P. BALMES(2), DANIEL B. BUNG(3)
ABSTRACT
Crossbar block ramps are nature-like flow structures to conquer large river bottom steps with adequate flow velocities and
flow depths for fish passage. Therefore, the channel will be divided into several basins, formed by crossbars of large
stones. Within these basins, a bed material layer is placed to avoid erosion processes and hence to reduce the risk of
structural failure. To guarantee stable block ramps, an adequate design is essential. Therefore, erosion processes within
the basins must be analyzed to develop design formulas for practical engineers. In the main focus of interest is the
material diameter, and density, to avoid relevant movement, which can decrease the stability of the structure. Nowadays,
numerical simulation tools revolutionize the hydraulic engineering field and flow simulations in 1D and 2D are state-of-theart.
But sediment transport simulations are still imprecise and difficult to adopt. For 2D transport processes in plan view
(depth averaged), numerical 2D simulation products can be used. Therefore, a detailed calibration with field data is
necessary, to ensure correct results. For detailed sediment transport and erosion studies, e. g. in the near-field of
hydraulic structures, 2D sectional models or 3D models are necessary. In this context the present paper deals with a
numerical model of a crossbar block ramp. The code FLOW-3D is used to include a packed sediment fraction within the
model. For various flow regimes the movement of base layer material between the crossbars is analyzed in detail.
Numerical model results are compared with experimental model results from a scaled physical model. The aim of the
study is to focus on the comparability between the experimental and numerical model relating scouring processes.
File Size : 936,367 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 17/08/2015
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