EGU21-1808
https://doi.org/10.5194/egusphere-egu21-1808
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

An initial assessment of bed destabilization risk past vegetation patches using instrumented particles

Yi Xu1, Valyrakis Manousos2, and Panagiotis Michalis3,4
Yi Xu et al.
  • 1University of Glasgow, Glasgow, United Kingdom of Great Britain and Northern Ireland (1007026638@qq.com)
  • 2University of Glasgow, Glasgow, United Kingdom (Manousos.Valyrakis@glasgow.ac.uk)
  • 3School of Civil Engineering, National Technical University of Athens, 157 80, Athens, Greece (pmichalis@mail.ntua.gr)
  • 4INNOVATEQUE, Athens, Greece (www.innovateque.com)

Instream vegetation may alter the mean and turbukent flow fields leading to destabilizing riverbed surface, under certain flow conditions. In particular, recent research on instream vegetation hydrodynamics and ecohydrogeomorphology has focused on how energetic flow structures and bulk flow parameters downstream a vegetation may result in riverbed destabilization. This study, demonstrated the application of a 20mm novel instrumented particle in recording entrainment rates downstream simulated vegetation patches of distinct densities, at various distances downstream these. A patch of 6mm acrilic cylinders is used to simulate the emergent vegetation having the same diameter (12cm) and different porosities or densities (void volume equal to 1.25%, 3.15%, 6.25%, 11.25%, and 17.25%). The flow velocity near the instrumented particle is recorded using acoustic Doppler velocimetry (ADV) with appropriate seeding, under clear water conditions. Preliminary results are presented with focus on the effect of vegetation patch density on the flow field and subsequent effects on particle entrainment rates and implications for bed surface destabilisation.

How to cite: Xu, Y., Manousos, V., and Michalis, P.: An initial assessment of bed destabilization risk past vegetation patches using instrumented particles, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1808, https://doi.org/10.5194/egusphere-egu21-1808, 2021.

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