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 : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : The impacts of a groyne field on secondary flow phenomena in a high curvature bend
The impacts of a groyne field on secondary flow phenomena in a high curvature bend
Author : S. Kashyap1, G. Constantinescu2, C.D. Rennie1 and R. Townsend1
Groyne fields can be used to protect river banks against sediment erosion in regions of high curvature. While the low flow velocity within the embayments protects the outer bank, the main channel mean velocity is increased. Little is known about how groynes affect the structure and strength of the streamwise and cross-stream flow in sharp channels and their impact on erosion. This Large Eddy Simulation (LES) study compares flow with and without submerged groynes (channel depth/groyne height=1.8) in a sharp 135 bend under initial scour conditions. Both simulations show that besides the main channel recirculation cell, strongly coherent streamwise oriented vortices (SOVs) form close to the inner bank. The LES results quantify the streamwise variation of the crossstream circulation induced by the main eddies in the cross flow. Results show the groynes significantly increase friction velocity over part of the inner bank close to the SOVs. The larger potential for inner bank erosion should be considered in groyne design for sharp channels with banks close to vertical.
File Size : 966,714 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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