Nearly half of Sweden’s population lives closer than 10km to the coast. About 6 percent of the population lives less than 100 m from a shoreline (coast, rivers, lakes) of which 70 percent live in densely built-up areas. In June 2017, the Swedish meteorological and hydrological institute (SMHI) released new guidance on mean sea level for three different IPCC scenarios for the Swedish coastline. The guidance indicates which areas will be perma-nently flooded by 2050 and 2100 in different climate scenarios, and the mean sea level at the coast for these eventualities.
This project deals with managed realignment as a potential climate adaptation measure along rivers and coast-lines in Sweden. Managed realignment (MR) is about adapting to a fluctuating shoreline, getting the buildings and the infrastructure to the right place, contributing to sustainable land use, and allowing space for water. The overall aim with MR is to increase society’s resilience to climate change by allowing the shoreline more flexible movement, which will benefit both the environment and socio-economic development. Realignment may include retreating to higher ground, reducing or shortening the defense length to be maintained, reducing wall or em-bankment heights, providing widening flood plains, or even re-thinking the types of development that can be allowed at the shoreline. These are all examples with the purpose to reduce the number of people and infrastruc-ture at risk, reduce defense costs, and recreate river and coastal habitats.The project includes four case study areas, Karlstad, Trelleborg, Umeå och Öckerö that represent four different hydrological and oceanographic environments.
Our research questions:
• What are the opportunities and obstacles of managed realignment?
• What are the different ways to visualize managed realignment?
• How can we build smart visualization tools for decision support?
• What can we learn about managed realignment to facilitate better decisions?
The project is a cooperation between the Swedish geotechnical institute, RISE, Linköping university and the Swedish meteorological and hydrological institute (länkar). Our partners are the county administrative boards of Västra Götaland, Skåne and Halland, Karlstad municipality, Trelleborgs municipality, Umeå municipality and Öckerö municipality.
The project started 2018 and is funded by The Swedish Research Council for Environment, Agricultural Sci-ences and Spatial Planning (FORMAS).
Gunnel Göransson PhD, project manager
Swedish Geotechnical institute