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.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : A Hydraulic Roughness Model for Submerged Flexible Vegetation
A Hydraulic Roughness Model for Submerged Flexible Vegetation
Author : Afis Olumide Busari and Chi-wai Li
Submerged vegetation is a key component in natural and restored rivers. It preserves the ecological balance yet has a hydraulic impact on the flow carrying capacity. The hydraulic resistance produced by submerged flexible vegetation depends on many factors, including the vegetation stem size, height, number density and flow depth. In the present work a numerical model is used to generate synthetic velocity profile data for hydraulic roughness determination. In the model turbulence is simulated by the Spalart-Allmaras closure with a modified length scale which is dependent on the vegetation density and vegetation height to water depth ratio. Flexibility of vegetation is accounted for by using a large deflection analysis. The model has been verified against available experiments. Based on the synthetic data an inducing equation is derived, which relates the Manning roughness coefficient to the vegetation parameters, flow depth and a zero-plane displacement parameter.
File Size : 665,093 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
Download Now