Search

Fish body geometry is highly variable across species, affecting the fluid-body interactions fish rely on for habitat choice, feeding, predator avoidance and spawning. We hypothesize that fish body geometry may substantially influence the velocity experienced by fish swimming. To test this hypothesis, we built nine full-scale physical prototypes of common freshwater fish species. The prototypes were placed in a large laboratory flume and upstream time-averaged velocity profiles were measured with increasing distance from the anterior-most location of each body. The measurements revealed that the body geometry can have a significant influence on the velocity profile, reducing the flow field at a distance of one body length upstream of the fish. Furthermore, it was found that the upstream velocity profiles from the nine fish species investigated in this study can be normalized to a single fit curve based on the freestream velocity and fish body length under subcritical flow conditions. These findings are significant, because they show that conventional point velocity measurements overlook the reducing effect of the fish body on the upstream flow field, creating a systematically biased representation of the velocity experienced by fish in subcritical flowing waters. This bias is illustrated by velocity field maps created with and without the presence of the physical models for three different fish species. Finally, we provide an example of how point velocity measurements can be recalculated to provide upstream velocity field maps closer to “the fish’s perspective”.

Im Zentrum ethohydraulischer Untersuchungen stehen Beobachtungen von Wassertieren unter einstellbaren Umweltbedingungen, welche in der Regel in Wasserbaulaboren durchgefuhrt werden. Aus den Beobachtungen gilt es, charakteristische Verhaltensweisen und deren Ursachen als Befunde abzuleiten. Die Befunde mussen dann sorgfaltig fur die Praxis validiert und je nach Anwendungsfall in ingenieurfachliche Gestaltungs-, Planungs- und Bemessungsempfehlungen fur wasserbauliche Anlagen transferiert werden. Daruber hinaus leisten ethohydraulische Untersuchungen auch einen Beitrag zur Definition der Lebensraumanspruche von Wassertieren in Form von messbaren Grenz- und Schwellenparametern oder gar zu deren sozialen Interaktionen in Form von qualitativen Aussagen (bspw. zum Schwarmverhalten).