Transitional polders along estuaries: Driving land-level rise and reducing flood propagation
نویسندگان
چکیده
Dikes are the conventional means of flood defence along rivers and estuaries. However, dikes gradually lead to superelevation waterbodies compared subsiding embanked areas, resulting in a rapidly increasing unstable situation under sea-level rise. Therefore, future management requires new, sustainable strategies that not only minimise risk, but also steer land-level An example is transitional polder, where dike-protected area temporarily reopened tide capture sediment until it has risen well above mean sea-level, after which could be returned its original function. This study explores how sequence opening polders affects large-scale estuary dynamics through 2D modelling Delft3D. To this end, different sequences were tested large estuary, using Western Scheldt (NL) as an example. Findings show rise all permutations. opened later experience lag muddy capture, most likely due deficit fines. Opening more upstream located alone or at start generally causes stronger reduction tidal range than downstream polders. explained by increased friction (1) locally added intertidal width (2) shallowing main channels because dominance. upstream-to-downstream caused greatest range, negligible increase historic dredging within for navigational purposes. Further work needed determine dredging, closure storm surges may negate benefit safety.
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ژورنال
عنوان ژورنال: Nature-based solutions
سال: 2022
ISSN: ['2772-4115']
DOI: https://doi.org/10.1016/j.nbsj.2022.100022