Near wake of emergent vegetation patches in shallow flow

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

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


Vegetation patches are particularly diffcult 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.

Original languageEnglish
Article number02057
JournalE3S Web of Conferences
Publication statusPublished - 5 Sept 2018
Externally publishedYes
Event9th International Conference on Fluvial Hydraulics, River Flow 2018 - Lyon-Villeurbanne, France
Duration: 5 Sept 20188 Sept 2018


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