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International audience; Introduction: The management of marine sediment is a major issue for many European countries, and a range of different sediment management challenges have to be addressed across Europe. The volume of sediment to be dredged, the level of contamination and the physical properties of sediments vary widely in North Western Europe countries, in addition to the risk and potential cost of not dredging. In addressing these issues and its own history, each country has developed its own regulatory system and direct comparison between countries is both difficult and challenging. Methods: Regulations and direct costs for the management of dredged material are well known, and are strong drivers for decision making, but the importance of indirect costs and ensuing benefits are now recognized although they have generally received less attention to date. Is the perception of dredged sediment reuse options by European stakeholders different in North Western Europe countries? How to strengthen indicators for a sustainable reuse of dredged material? How to help stakeholders to take decisions for dredged material reuse? What is the global impact in terms of economics and the environment for dredged material reuse options? In this context, the CEAMaS Interreg IVB project has taken a multidisciplinary approach involving eight partners from Belgium, France, Ireland and the Netherlands in collaborative research and development to produce analyses and decision tools to support and facilitate stakeholders in strengthening reuse options. Results: This European project develops shared analyses regarding the perception of sediment reuse in Europe by stakeholders, technical issues for application and sediment characteristics analysis, Life Cycle Assessment for dredging and treatment techniques, and economic modeling for several reuse options or geographic-based (GIS) technologies for the evaluation of economic opportunities. These shared analyses will allow the development of a range of online decision tools and case studies, available through the CEAMaS website and a future European Center of Resources for sediment reuse. This communication will describe the global approach and findings in the CEAMaS project in this global field of investigation. The CEAMaS project involves a cooperation between CD2E as lead partner

International audience; The management of dredged sediments is an increasing issue for harbours and local authorities. Consequently, contaminated sediments are the subject of intense technology development, such as beneficial reuse or in situ treatment. However, current decision analysis approaches, such as comparative risk assessment, benefit-cost analysis, and life cycle assessment, do not offer a comprehensive approach for incorporating the varied types of information and multiple stakeholder and public views [1]. In this context, the EU Interreg-funded CEAMaS project promote the beneficial re-use of marine sediments in civil engineering applications, in a sustainable, economic and socially acceptable manner. The objective of this paper is to support management alternatives for dredged marine sediments based in two main criteria: The first one is compliance to legislation related to sediment management, which differs in each country. The second criteria are the physical, mechanical and chemical properties of dredged marine sediments, which define the possible civil engineering applications and other reuse options according to national legal frameworks and standards. It allows also the selection of a treatment process (if needed) and to determine other reuse operational options. Methods: The methodology of this study is based on the development of a database on the legislations related to sediment management in CEAMaS project partner countries (Ireland, France, Belgium and the Netherlands), and on the mechanical, physical and chemical requirements of various civil engineering applications (such as infrastructure, coastal protection works or as a building material, ...). An experimental work is then carried out at the laboratory scale. Dredged marine sediments from different locations are characterised, according to various national standards and common characterisation methods for sludge properties. Engineering suitability and environmental compliance are both addressed for all samples by each partner according to its national methodology. This methodology allows a comparison of each sediment properties with the reference values of each national legislation. Therefore, it identifies the potential civil engineering applications for various sediment types, and the different possible treatment processes (if needed). Results and discussion: The first samples show contaminant values in excess of national standards but not necessarily for the same contaminants for all countries. They show a large range of mineral and engineering properties, reflecting their sedimentological and geographic origin. This leads them towards different possible applications. Based on the database and laboratory works, a tool is being developed for the application to different dredged marine sediments. This tool is based mainly on regulatory and technical aspects for the management alternatives of sediments, by connecting sediment's composition and characteristics with reuse application requirements and sludge treatment procedures In the CEAMaS project, the economic feasibility and the social aspects are also considered for re-use options of marine sediments in civil engineering applications. A Multicriteria Decision Analysis framework will be developed for guiding individual decisionmakers to choose the best reuse option of sediments, depending on the criteria of interest.