Activities have started in all WPs with the first achievements laying the scientific foundations for further work. In WP2 key activities included the identification of indicators to assess river connectivity, developing methods for evaluating it, and collecting data on barriers and restoration measures. WP2 also explored innovative solutions for improving connectivity, including Earth Observation techniques and hydrodynamic modelling. First findings were compiled in the "Catalogue of Action Options to Restore River Connectivity in the DRB". This includes a collection of around 60 measures and their fundamental applications, accompanied by practical information.
Within WP3, a gap analysis was conducted to assess the availability of data on riverine fish species in the DRB with the aim to close gaps in biodiversity monitoring and guide restoration actions. Data were collected from various sources, including reports, scientific papers, and surveys. A new data cleaning method was developed, providing the input for a species distribution model (SDM) that has been used to create a spatial distribution of occurrence for 58 fish species. The project also launched a transboundary biodiversity monitoring scheme, collaborating with stakeholders and contributing to the upcoming Joint Danube Survey 2025.
Looking at the economic side of River Restoration, WP4 focused on assessing around 60 river restoration measures to determine their effectiveness as NBS. Multifunctionality has been parameterized by the novel Average Ecosystem Service Support Index (AESSI), including an index on the number of Win-Win-Successes. The results were compiled into a manual. Furthermore, a comprehensive methodology for evaluating the economic benefits of NbS, including cost-benefit analysis and Input-Output Analysis, has been developed.
WP5 has identified and connected key actors, created a comprehensive database, and launched the Healthy Danube Network. Environmental education programs, such as participatory theatre and exhibitions, and the Blue Danube Travelling Exhibition have been developed and/or have started. A river walk in Romania and Water Sport Clean Up events to monitor pollution have been planned and are upcoming. Additionally, a Citizen Science Toolbox is under development to support restoration, involving innovative monitoring tools and workshops at Demo Sites.
In WP6 work on all three demonstration sites has started successfully: For the Upper Danube, discussions and site visits took place to plan restoration actions at Paradeisinsel, Austria, with local communities involved in co-creation efforts. The technical plans are complete, with implementation set to begin after final approvals. At the middle Danube Site, restoration plans have been adjusted due to permit delays. Preparations are ongoing, including material estimates and participatory approaches to engage local stakeholders. For the Danube Delta a "design-thinking" approach is being used to address complex ecological challenges, focusing on improving lagoon connectivity. Stakeholders have recognised the environmental issues and potential solutions. Roadmaps for the replication of solutions in associated regions are being developed now.
WP7 has selected the ESRI GIS suite for developing a screening tool to support restoration in the DRB. A prototype was demonstrated, featuring interactive elements and classification methods for restoration measures. Efforts are ongoing to ensure uniformity in GIS data across work packages, with a focus on using ICPDR data.
