Author(s): J. Vergeynst; R. Baeyens; J. Coeck; T. De Mulder; I. Nopens; I. Pauwels; A. Mouton
Linked Author(s): Tom De Mulder
Keywords: No Keywords
Abstract: Navigation locks play an important role for ship navigation on canals and other regulated waterways worldwide. Unfortunately, these structures may severely impact the aquatic ecosystem and freshwater fish in particular. In Belgium (Europe), the Albert Canal connecting the river Meuse to the river Scheldt, is an important migration route for European eel (Anguilla anguilla, critically endangered) and Atlantic salmon (Salmo salar, vulnerable). During their downstream migration (respectively silver eel and salmon smolt phases) these fish are hampered by six subsequent navigation lock complexes present in the canal. In the coming years, Archimedes screws are to be installed next to these complexes. These can function both as pumping stations and hydropower generators. A first installation is already present at the navigation lock complex of Kwaadmechelen. Before fish mitigation measures can be implemented, it is important to gain understanding on how the downstream migrating fish are affected by hydrodynamics around the complex. In this part of the project, we used positioning telemetry to reveal how the fish react on such a complex hydrodynamic situation, resulting from the combination of navigation lock levelling, passing ships, operation of the pumping/hydropower station and translatory waves. We also investigate whether behaviour is determined solely by the hydrodynamics or whether personality (e. g. doubters versus decisive individuals) plays a crucial role.
Year: 2018