Influence of vegetation on compound-channel turbulent field

R. Azevedo, J. B. Leal, L. Rojas-Solórzano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

During floods, rivers generally present a compound section configuration, constituted by a faster flow in the main channel and a slower one in the floodplains. The interaction of these flows has a complex turbulent 3D field composed by large-scale horizontal structures and secondary cells. These turbulent structures are responsible for significant lateral momentum transfer. Most rivers present also vegetation, namely trees along the floodplains edges. The wakes formed in front of the vegetation elements alter the classical compound channel turbulent field. In this paper, rods were placed at the edge of the floodplain of an experimental flume, simulating trees.A 2D LDV was used to measure the velocity field. The velocity distribution is modified by the rods due the formation of wakes. In particular, the 2D flow equations are not applicable and the turbulent scales and dissipation rate acquire a longitudinal variation due to longitudinal vortex propagation.

Original languageEnglish
Title of host publicationRiver Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics
Pages209-216
Number of pages8
Publication statusPublished - Nov 1 2012
Externally publishedYes
EventInternational Conference on Fluvial Hydraulics, River Flow 2012 - San Jose, Costa Rica
Duration: Sep 5 2012Sep 7 2012

Publication series

NameRiver Flow 2012 - Proceedings of the International Conference on Fluvial Hydraulics
Volume1

Other

OtherInternational Conference on Fluvial Hydraulics, River Flow 2012
CountryCosta Rica
CitySan Jose
Period9/5/129/7/12

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Geotechnical Engineering and Engineering Geology

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