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- W4220683990 abstract "Managed realignment is the landward relocation of flood infrastructure to re-establish tidal exchange on formerly reclaimed land. Managed realignment can be seen as a nature-based flood defence system that combines flood protection by the realigned dike (artificial) and restored saltmarshes (nature-based). So far, research on coastal managed realignment is primarily directed to saltmarsh restoration on formerly reclaimed land. This study focuses on the realigned dikes. The aim of this research is to characterize realigned dikes and to indicate the characteristics that offer opportunities for nature-based flood protection. We categorized 90 European coastal managed realignment projects into two realigned dike groups: (1) Newly built landward dikes and (2) Existing landward dikes of former multiple dike systems. The second group has two subcategories: (2a) Former hinterland dikes and (2b) Realignments within summer polders. For each group we present the realigned dike characteristics of a representative case study. We consider that the use of existing landward dikes or local construction material make realignment more sustainable. From a nature-based flood protection perspective, the presence of an artificial dike is ambiguous. Our results show that targeted and expected saltmarsh restoration at managed realignment does not necessarily result in a greener realigned dike design that suits for combined flood protection with restored saltmarshes. We recommend coastal managers to explicitly take combined flood protection into account in the realigned dike design and steer the topography of the realignment site to facilitate nature-based flood protection and promote surface elevation increase seaward of the realigned dike in response to sea level rise. This makes managed realignment a nature-based flood defence zone for now and for the future. • We classify 90 managed realignment projects based on their realigned dike. • We distinguish two realigned dike groups: Newly built and Existing landward dikes. • Using existing dikes or local construction material make realignment more sustainable. • The dike plus saltmarsh make managed realignment a nature-based flood defence zone." @default.
- W4220683990 created "2022-04-03" @default.
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- W4220683990 date "2022-05-01" @default.
- W4220683990 modified "2023-09-29" @default.
- W4220683990 title "Characteristics of realigned dikes in coastal Europe: Overview and opportunities for nature-based flood protection" @default.
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- W4220683990 doi "https://doi.org/10.1016/j.ocecoaman.2022.106116" @default.
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