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Institut für Wasser- und Umweltsystemmodellierung - IWS



"Modelling the Influence of a Tidal Barrage on the Eutrophication Potential and the Estuarine Ecosystems Using a System Dynamics Approach "

With a growing need for carbon neutral electricity, the Severn Estuary with its high tidal currents and tidal range could play an important role by providing tidal renewable energy. Tidal energy usage would change the estuarine conditions influencing important habitats. A qualitative input-output graph was used as a base description of the structure of the system. Transfer functions and parameters were derived from DIVAST and other modeling result as well as from empirical data. Linkages between tidal energy usage, the eutrophication potential and the estuarine foodweb were integrated into the systems dynamics model for different tidal barrage scenarios including ebb-only and two-way generation. With this approach it was possible to study connections between more localized effects in the estuary and global effects of tidal energy along a timeline taking requirements from different stakeholders into consideration. This can help to reduce negative effects, optimize mitigation measures and improve operation schemes for different tidal power devices.