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 : The formation of sand ripples in a turbulent flow
The formation of sand ripples in a turbulent flow
The transport of grains by a fluid flow is frequently found in both nature and industry. Some examples are the transport of sand in rivers and channels, the transport of sand by wind, and the transport of sand in petroleum pipelines. When the shear stresses exerted by the fluid flow are moderate, some grains are set in motion without fluidizing the bed. The moving grains form a granular layer that moves while maintaining contact with the fixed part of the bed. In some cases, the granular bed becomes unstable, generating ripples and dunes. This paper presents an experimental study on the formation and migration of ripples under a turbulent liquid flow. In our experiments, fully-developed turbulent water flows were imposed over a granular bed of known granulometry. For different flow rates, the growth and migration of bedforms were filmed by a high-definition camera. The wavelength and the celerity of bedforms were determined from the acquired images
File Size : 626,480 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 : 27/08/2015
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