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 : Experimental and numerical investigation of the bed morphology evolution in river contractions
Experimental and numerical investigation of the bed morphology evolution in river contractions
This paper focuses on the bed morphology evolution at river contractions based on laboratory experiments and 2D
numerical models. Experiments were carried out at University of Basilicata, Italy, in a 1 m wide and 20 m long
rectangular channel. Two nearly-uniform sediments were used as mobile bed, sand with median grain size d501.7 mm
and gravel with d509 mm. Contraction model was either 0.5 or 1.0 or 2.0 m long. Experiments were carried out under
steady flow and clear-water approach flow conditions. Several tests were of long duration to achieve conditions of quasiequilibrium
and deep scour holes as well. Based on the experimental data empirical models are proposed to predict the
main bed features for long contractions as function of contraction ratio, densimetric Froude number, relative contraction
length, and dimensionless time. Spatial and temporal observations of bed morphology are also compared to results from
the application of CCHE2D (University of Mississippi) numerical model. Effects of contraction length and average
adaptation length are discussed.
File Size : 870,957 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 : 18/08/2015
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