Author(s): Dan A. Nilsson; Anders G. Andersson; I.A. Sofia Larsson; Robin Andersson; Mats Billstein
Linked Author(s):
Keywords: Open channel flow; Turbulence; Shallow flow; Idealized stone; Experiments
Abstract: In aquatic environments, turbulence significantly influences fish swimming performance and habitat preference. Lacey et al. (2012) developed the IPOS framework, identifying turbulence intensity, periodicity, orientation, and scale as key factors in understanding fish behavior. They also highlighted the role of Reynolds stresses (RS), linking higher stresses to increased energy expenditure. Understanding these stress distributions is crucial for connecting laboratory studies to the complex, heterogeneous flows in natural aquatic habitats. Many natural waterways contain shallow regions with large roughness elements, such as stones and trees, with sizes comparable to the water depth. These obstructions cause variations in turbulence levels. However, there is currently a lack of 3D flow measurements around such obstacles. This study aims to evaluate the relationship between RS and Reynolds number under shallow water conditions, providing insights into wake dynamics and implications for fish swimming performance.
Year: 2025