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 : 3D Numerical Investigation of Effects of Channel Width Change on Flow Structure at Two River Conflue...
3D Numerical Investigation of Effects of Channel Width Change on Flow Structure at Two River Confluence
Author : Mona Nemati Attar and Akbar Safarzadeh
River channel confluences are critical interface where intense changes in physical processes occur. These changes affect both the local and downstream characteristic of the river flow and of the bed. In the present study, using SSIIM 2.0 model first the turbulent flow pattern at two river confluence with 90 degrees confluence angle has been simulated and numerical results are compared with available experimental results. Then, in order to investigate effects of gradual changes of the main channel width on the water surface map and also on the characteristics of the separation zones, diverging and converging cases with various width rations have been simulated. Results illustrate that due to longitudinal pressure gradient which arises from channel width changes, increasing downstream width of the main channel as well as a decrease in discharge ratio leads to various changes in characteristics of the separation zone, higher velocity amplification, and also intensified water surface variations in the confluence zone.
File Size : 460,309 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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