Author(s): Dan Nilsson; Anders Andersson; Sofia Larsson; Robin Andersson; Mats Billstein

Linked Author(s): Dan Nilsson, Anders Andersson, Robin Andersson

Keywords: Relative submergence; Turbulence; Experiments; Boulder; Fish habitat

Abstract: 4D-PTV quantified energy-containing eddies in the wake of a cubic obstacle at two relative submergences via the integral length scale L. Expressing eddy size as χ = L/Lf connects these hydraulic scales to fish body length and habitat relevance. Linking wake turbulence to fish -scale interactions, this study provides a quantitative ecohydraulic scaling and demonstrates that increased submergence produces larger energy-containing eddies, suggesting greater biomechanical suitability for larger-bodied fish.

DOI: https://doi.org/10.64697/iahr.proc.ise2026.abs.139

Year: 2026