ECAS-Baltic, explores strategies for ecosystem supporting coastal adaptation measures for the German Baltic Sea coast. Such measures are often referred to as nature-based solutions and involve the (re-)creation of coastal wetlands such as saltmarshes, seagrass beds, brackish water reed belts but also managed realignment and sand or dune nourishments. Within the   joint   research   project,   CRSLR   supports   the   transdisciplinary   development   of   nature-based solutions and aims at understanding their effects on regional and local flood risk with the use of hydrodynamic models. Our project partners develop spatially and temporarily highly resolved sea-level rise projections for the study area, which we use as input for the hydrodynamic models. This enables us to assess not only current, but also future flood risk for the German Baltic Sea coast with and without large scale application of nature-based solutions. We also conduct further, more detailed, analysis at local scale for two selected case studies, which we have identified as hotspots of coastal change (based on the regional analysis). These case studies are Schleimünde in Schleswig-Holstein and Ahrenshoop in Mecklenburg-West Pomerania. In those locations our project partners assess the morphologic stability of a natural sandy spit and a large-scale sand nourishment, respectively, and we use their findings to analyze potential implications on local flood risk. Thereby, we additionally account for the possibility of applying other nature-based solutions such as managed realignment. Our results are expected to contribute to a better understanding of current and future flood risk for the German Baltic Sea coast, by identifying the potential for, and effectiveness of, nature-based solutions in providing coastal protection for local coastal populations. In addition, the restored coastal wetlands will be of high ecological importance and provide highly valued ecosystem services.

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