Near wake of emergent vegetation patches in shallow flow

Wunder, Sina; Trevisson, Michele; Heckele, Christoph; Chagot, Loïc; Murphy, Brendan; McLelland, Stuart; Moulin, Frédéric; Eiff, Olivier

Abstract

Vegetation patches are particularly difficult to quantify in terms of flow resistance due to their complex geometry and topological behaviour under hydrodynamic loading. They not only influence the water level and mean velocities due to the drag they exert, but they also affect the turbulence and hence all transfer processes such as the sediment transport dynamics in the surrounding area. Existing studies dealing with the interaction of flow and vegetation concern mostly measurements of the drag of single plants followed by analyses of the flow through and above homogeneous canopies. However, studies of the flow around single patches are uncommon and are mostly restricted to arrays of cylindrical elements. For leafy plants there is very limited information and understanding of how the flow evolves through and around the plants. This work aims at filling these gaps via complementary physical lab-scale and numerical experiments of the flow through and around an artificial vegetation patch. The experimental work focuses on PIV measurements in the wake of the patches whereas the method of large-eddy simulation is employed to provide additional insights of the flow inside the patch. Here we focus on results based on the PIV measurements.

Citation

Wunder, S., Trevisson, M., Heckele, C., Chagot, L., Murphy, B., McLelland, S., …Eiff, O. (2018). Near wake of emergent vegetation patches in shallow flow. E3S Web of Conferences, 40, Article 02057. https://doi.org/10.1051/e3sconf/20184002057

• Journal Article Type: Article
• Conference Name: River Flow 2018 - Ninth International Conference on Fluvial Hydraulics
• Conference Location: Lyon-Villeurbanne, France, September 5-8, 2018
• Acceptance Date: May 7, 2018
• Online Publication Date: Sep 5, 2018
• Publication Date: 2018
• Deposit Date: Sep 21, 2018
• Publicly Available Date: Sep 24, 2018
• Journal: E3S Web of Conferences
• Print ISSN: 2267-1242
• Electronic ISSN: 2267-1242
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 40
• Article Number: 02057
• DOI: https://doi.org/10.1051/e3sconf/20184002057
• Keywords: River morphodynamics and restoration
• Public URL: https://hull-repository.worktribe.com/output/1063762
• Publisher URL: https://www.e3s-conferences.org/articles/e3sconf/pdf/2018/15/e3sconf_riverflow2018_02057.pdf