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 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Experimental Characterization of the TKE Budget in Flows with Emergent Vegetation
Experimental Characterization of the TKE Budget in Flows with Emergent Vegetation
Author : Rui M.L. Ferreira, Ana M. Ricardo and Katinka Koll
The flow within and above plant canopies in estuarine wetlands is normally turbulent in the inter-stem space. Turbulent kinetic energy (TKE) is mainly produced due to vortex shedding from individual stems. Due to the complex spatial distribution of the flow field,the relative magnitude of the terms of the TKE budget is not well known in the inter-stem space. This work is aimed at the characterization and quantification of the terms of TKE equation to advance the understanding of the nature of turbulence of this kind of flows. The work is fundamentally experimental and is based on the analysis of 3D Laser Doppler Anemometry (LDA) and 2D Particle Image Velocimetry (PIV) databases, for which the spatial resolution is of the order of magnitude of Taylor's microscale.The compatibility of the two databases proved to be sufficiently good. This work leads to the conclusion that turbulent production is mainly wake production. There are important turbulent fluxes of TKE and interactions between the mean and turbulent flow fields. Convective terms are important in the vicinity of the stems while turbulent diffusion is mostly associated to the von K rm n vortex streets. The dissipation rate of TKE presents smaller spatial variations and its magnitude increases with the stem areal number-density.
File Size : 1,452,274 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
Download Now