Abstract
Physical and 3D numerical hydrodynamic flow models and an agent-based model are developed with the principal objective of analysing fish behaviour in two vertical slot fishway configurations. Fish energy consumption due to swimming represents a crucial criterion for selecting an appropriate fishway configuration. The modelled fish detects ambient flow conditions, makes decisions based on its sensing and cognitive abilities, adapts to the changes in its environment, and moves toward the regions of less turbulent kinetic energy. The results show that fishways with longer pools enable passage of fish at a lower energy consumption.
Highlights
Climate change, environmental degradation, loss of biodiversity, and similar topics, have been increasingly debated in many research papers, various expertise studies, and discussions, as the extremely negative consequences of human-related activities
Their research resulted in recommendations for the flow velocity criteria that should be considered in the vertical slot fishway design
Physical and 3D hydrodynamic numerical models were developed for two vertical slot fishway configurations while the numerical component was upgraded with the original Agent-Based Model (ABM) of the fish swimming upstream
Summary
Environmental degradation, loss of biodiversity, and similar topics, have been increasingly debated in many research papers, various expertise studies, and discussions, as the extremely negative consequences of human-related activities. A more detailed analysis of the relationship between the fish body length, swimming capability, and vertical slot fishway design, is presented by Cai et al [14]. They note that fish tend to use burst velocity even when low velocities with small fluctuations occur, i.e. in flow conditions that could be overcome by using prolonged speed They present a common equation for calculating the fish drag power. Bermudez et al [18] analysed movement of brown trout (Salmo trutta), Iberian straight-mouth nase (Pseudochondrostoma polylepis), and Iberian barbel They presented recirculation zones where low turbulence and velocities occur within vertical slot fishways. These zones are usually designed as resting areas and the study showed that fish stay most frequently behind baffles just downstream of the slot. The basic concept of the developed provided below for the fish movement towards the minimum
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